attacks or slurs, hate speech, demonstrably false information, excessive profanity, or that are thinly veiled promotions for a product, will not be approved. Facebook Page: Blue Bird Corporation Fans. S6.2.2 At the beginning of the first effectiveness test specified in S7.3, and at the beginning of each burnishing procedure, each EV's propulsion battery is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. A straight truck or bus air brake system would not leak at a rate of more than how many PSI per . they are hydro boost with a backup electric motor that operates the assist in case of engine failure. This chapter applies to the course of instruction and physical examination for school bus drivers required by 75 Pa.C.S. Please do not provide confidential Any missing, broken or improperly installed part(s) A 39.04 Hydro-vac/Assist 6. Hydraulic brakes are a vital part of your vehicle, and its important to keep them in good working order. Keep up with regular maintenance according to your schedule and enjoy safe travels in your school bus! Remove old certificate. Spike stop means a stop resulting from the application of 200 lbs of force on the service brake control in 0.08 s. Split service brake system means a brake system consisting of two or more subsystems actuated by a single control, designed so that a single failure in any subsystem (such as a leakage-type failure of a pressure component of a hydraulic subsystem except structural failure of a housing that is common to two or more subsystems, or an electrical failure in an electric subsystem) does not impair the operation of any other subsystem. Maintain control force until vehicle has stopped. Make six stops from 60 mph with vehicle at lightly vehicle weight, or at the manufacturer's option for a vehicle with GVWR greater than 10,000 pounds, at lightly loaded vehicle weight plus not more than an additional 1,000 pounds for a roll bar structure on the vehicle. There should be no more than 3 psi of air loss. Have you ever wondered why trucks and buses make those funny squeaking and hissing sounds? Initial brake temperature means the average temperature of the service brakes on the hottest axle of the vehicle 0.2 mi before any brake application. All was good according to them. For centergrooved shoes or pads, thermocouples are installed within one-eighth of an inch to one-quarter inch of the groove and as close to the center as possible. All buses using hydraulic brake systems must be equipped with emergency brakes and parking brakes. (when the temperature of components on both ends of an axle are averaged). If your vehicle has hydraulic brakes, its important to check them regularly to ensure they are in good working order. Choosing an item from If you drive the same bus everyday I think air is fine, I prefer hydraulic though I guess just because that's what I use the most. (c) The master cylinder or brake power unit reservoir for compliance with the volume and labeling requirements of S5.4.2 and S5.4.3. S7.9.3 Repeat S7.9.1 and S7.9.2 with vehicle at GVWR. If the initial brake temperature for the first stop in a test procedure (other than S7.7 and S7.16) has not been reached, heat the brakes to the initial brake temperature by making not more than 10 snubs from not more than 40 to 10 mph, at a deceleration not greater than 10 fpsps. Get it fixed before driving. will bring you directly to the content. Hydraulic or Air Brakes? On vehicles with brake power assist units, render the brake power assist unit inoperative, or one of the brake power assist unit subsystems if two or more subsystems are provided, by disconnecting the relevant power supply. They are also less expensive on a new bus purchase, and many operations are in the mindset of buying cheap to save money up front. Preventing these and other school bus brake issues can be as simple as bringing your school buses to us to inspect, maintain, and repair. Make 10 successive spike stops from 30 mph with the transmission in neutral, with no reverse stops. The test takes place with the (a) For an EV equipped with RBS, the RBS is considered to be part of the service brake system if it is automatically controlled by an application of the service brake control, if there is no means provided for the driver to disconnect or otherwise deactivate it, and if it is activated in all transmission positions, including neutral. The wind velocity is zero. 0000000987 00000 n Thats because when you turn the key to on position, it also activates the starter motor. S5.1.2.4 For an EV manufactured with a service brake system that incorporates RBS, the vehicle shall be capable of stopping from 60 mph within the corresponding distance specified in Column IV of Table II with any single failure in the RBS, and with all other systems intact. The second test is a flow check. 0000004589 00000 n 0 S6 Test conditions. <]>> (a) For vehicles with electrically-actuated service brakes, the tests in S7.10.1 or S7.10.2 are conducted with any single electrical failure in the electric brake system instead of the brake power or brake power assist systems, and all other systems intact. At completion of 10 spike stops, make six effectiveness stops from 60 mph. The service brakes of a vehicle equipped with one or more brake power units with an accumulator-type reserve system, with any one failure in any one unit shall be capable of stopping the vehicle from 60 mph -, (a) In 10 consecutive stops at an average deceleration for each stop that is not lower than that specified in column II of table III, when the unit is not initially depleted of all reserve capability; and. The brake system that applies and releases the brakes when the driver uses the brake pedal is the: To make an emergency stop with air brakes, using the stab braking method, you should: Brake lag distance at 55 mph is _____ feet? (b) The parking mechanism must be engaged before the ignition key can be removed. If lining thickness at the thinnest point appears to be 3/16 inch (4.76 mm) or less, the pad must be replaced. Accelerate immediately to the initial test speed after each snub. Visually inspect the brake pad lining by checking each visible end and look through the opening of the caliper. Then make six stops from 60 mph. There are a few reasons. S5.1.1.2 In the second effectiveness test, each vehicle with a GVWR of 10,000 pounds or less and each school bus with a GVWR greater than 10,000 pounds shall be capable of stopping from 30 mph and 60 mph, and each vehicle with a GVWR greater than 10,000 pounds (other than a school bus) shall be capable of stopping from 60 mph, within the corresponding distances specified in Column II of Table II. Restore the system to normal at completion of this test. The secure and easy all-access connection to your content. The service brakes of a vehicle equipped with one or more brake power assist units or brake power units with a backup system, with one brake power assist unit or brake power unit inoperative and depleted of all reserve capability and with only the backup system operating in the failed subsystem, shall be capable of stopping the vehicle from 60 mph in 15 consecutive stops at an average deceleration for each stop that is not lower than 12 fpsps (equivalent stopping distance 323 feet). The indicator lamp shall be deactivated at the end of the check of lamp function unless there is a malfunction or a message about a malfunction that existed when the key switch was last turned to the off position. Each modulator may also adjust the brake actuating forces at other wheels that are on the same axle or in the same axle set in response to the same signal or signals. S5.5 Antilock and variable proportioning brake systems. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. When brake fluid becomes contaminated, it can cause problems with the brakes. A separate drafting site Average the maximum brake control force required for the three stops. The pedal should not move (lose pressure) during those five seconds. A course for truck, bus & RV drivers operating a vehicle fitted with air brakes. If the pedal sinks to the floor, there may be a leak in the system. Advanced Member, Thomas Ford 85-16 Air >hydraulic. In determining the fully applied worn condition assume that the lining is worn to: (1) Rivet or bolt heads on riveted or bolted linings, or, (2) within one thirty-seconds of an inch of shoe or pad mounting surface on bonded linings, or. Each school bus with a GVWR greater than 10,000 pounds manufactured on or after March 1, 1999 shall be capable of meeting the requirements of S5.1.1 through S5.1.5, under the conditions prescribed in S6, when tested according to the procedures and in the sequence set forth in S7. full text search results (c) Unlimited wheel lockup is allowed during spike stops (but not spike check stops), partial failure stops, and inoperative brake power or power assist unit stops. 3. Is it because school bus operators are too cheap to train their drivers? S5.1.1.1 In the first (preburnished) effectiveness test, the vehicle shall be capable of stopping from 30 mph and 60 mph within the corresponding distances specified in column I of table II. Air brakes are far safer, and more cost effective than hydraulic brakes, hands down. Immediately upon reaching that speed make five stops, each from 30 mph at 10 fpsps for each stop. 1 Depleted. FAR). S7.7.4 Non-service brake type parking brake systems. (d) Restore systems to normal at completion of these tests. S5.1.5 Water recovery. This document is available in the following developer friendly formats: Information and documentation can be found in our Explanation To test hydraulic brakes, you should pump the brake pedal three times, then apply firm pressure to the brake pedal and hold for five seconds. Brake power assist unit means a device installed in a hydraulic brake system that reduces the operator effort required to actuate the system, and that if inoperative does not prevent the operator from braking the vehicle by a continued application of muscular force on the service brake control. Electric vehicle or EV means a motor vehicle that is powered by an electric motor drawing current from rechargeable storage batteries, fuel cells, or other portable sources of electrical current, and which may include a non-electrical source of power designed to charge batteries and components thereof. (d) The brake system indicator light(s), for compliance with operation in various key positions, lens color, labeling, and location, in accordance with S5.3. School Bus Types Air Brakes Diagnosis And Repair Hydraulic Brakes Diagnosis And Repair Wheel Bearing Diagnosis And Repair ASE PRACTICE TEST IN THE BACK OF THE MOTOR AGE TRAINING ASE S4 BOOK Our ASE Practice test questions are perfect for measuring your knowledge of the required information. S7.6 First reburnish. xref Start the engine and run at idle speed. Check the fluid level in the hydraulic brake reservoir. The Federal Motor Carrier Safety Administration (FMCSA) has developed and issued standards for State testing and licensing of CDL holders. 0000000016 00000 n Its a 34' Freightliner Thomas. I am all for air brakes. How Do You Test a Hydraulic Brake Booster? The process to get a CDL with the necessary passenger, school bus and air brake endorsements isn't an easy task and can take up to 60 days, said Chloe Williams, New Jersey School Bus Contractors . Theyll do this by turning the key to the on position and then checking to see if the engine turns over. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. Turn the bus off. Control force readings may be terminated when vehicle speed falls to 5 mph. This will help keep your car from rolling as well, but should only be used as a last resort. Regulation Y pressure to operate the bus. My fleet vehicles are 34' Freightliner tour buses with hydraulic disk. Top Member, ihthomas665spd Attain the required deceleration within 1 s and maintain it for the remainder of the snubbing time. Use only heavy-duty brake fluid, DOT 3. S2. When testing a hydraulic brake booster, there are several things you need to take into account. Each vehicle must be equipped with a service brake system acting on all wheels. S7.7.1.4 Following the application of the parking brake in accordance with S7.7.1.3, release all force on the service brake control and commence the measurement of time if the vehicle remains stationary. S6.10 Vehicle position and wheel lockup restrictions. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. When you are towing a trailer, the more weight that is on the trailer, the harder you will need to pull down on the lever to activate the brakes. 117. . formatting. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. The brakes shall be adjusted three times during the burnish procedure, in accordance with the manufacturer's recommendations, after 125, 250, and 375 snubs. (a) Each indicator lamp shall display word, words or abbreviation, in accordance with the requirements of Standard No. Maximum drive-through speed means the highest possible constant speed at which the vehicle can be driven through 200 feet of a 500-foot radius curve arc without leaving the 12-foot lane. S7.7 Parking brake test. %%EOF Organization and Purpose A vehicle shall be deemed to comply with the stopping distance requirements of S5.1 if at least one of the stops at each speed and load specified in each of S7.3, S7.5(b), S7.8, S7.9, S7.10, S7.15 and S7.17 (check stops) is made within a stopping distance that does not exceed the corresponding distance specified in Table II. %PDF-1.4 % (This test is not applicable to a vehicle which has a GVWR of not less than 7,716 pounds and not greater than 10,000 pounds and is not a school bus.). Better stopping power. If you have questions for the Agency that issued the current document please contact the agency directly. Average the maximum brake control force required for the three snubs. Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. (C) If a separate indicator lamp is provided for an anti-lock system, the single word Antilock or Anti-lock, or the abbreviation ABS, may be used for S5.3.1(c). What is the Most Common Problem in a Brake Hydraulic System? The flow switch is the switch on the booster side of he brake system. By clicking the submit button below, you are agreeing with Bobit Business Medias Privacy Policy and this outlined level of consent. a. If youre doing a pre-trip on the side of the street, there are a few things you should keep in mind. 2. title 49 of the Code of Federal Regulations, 7. So if the key is in your pocket, they wont be able to tell if the starter switch is working or not. For EVs having a manual control for setting the level of regenerative braking, the manual control, at the beginning of each burnish procedure, is set to provide maximum regenerative braking throughout the burnish. All Buses Must-Have Emergency Brakes. How many seconds should you apply pressure to the brake pedal while doing a hydraulic brake check? This members-only test covers must-know topics including medical certificate renewal, preventing brake fade, and more. Variable proportioning brake system means a system that automatically adjusts the braking force at the axles to compensate for vehicle static axle loading and/or dynamic weight transfer between axles during deceleration. This consists of a warning signal that will come on to alert you before the air pressure in the tanks falls below 60 psi. S5.1.1.4 In the fourth effectiveness test, a vehicle with a GVWR of 10,000 pounds or less shall be capable of stopping from 30 and 60 mph within the corresponding distances specified in column I of table II. 6 b. A school bus shall not a. Open caps and check fluid level. 36 FR 22902, Dec. 2, 1971, unless otherwise noted. Why Hydraulic Brakes Do Not Work If Bubbles of Air Leak into the Liquid? 8 c. 10 d. 15 user convenience only and is not intended to alter agency intent S7.7.1.1 Condition the parking brake friction elements so that the temperature at the beginning of the test is at any level not more than 150 F. See this. Your email address will not be published. The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. S5.1.6 Spike stops. A split-second delay in brake reaction is present in all air brake systems. 0000000016 00000 n Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. Enhanced content is provided to the user to provide additional context. (f) For a vehicle with electric transmission of the service brake control signal, failure of a brake control circuit. Learn more about the eCFR, its status, and the editorial process. The in-page Table of Contents is available only when multiple sections are being viewed. This questions appears in the following tests: Colorado Double District Of Columbia Class A Knowledge Test Illinois Passenger TEST 3: Service brake warning system test. S5.2.2.3 With the parking mechanism engaged and the parking brake not engaged, the parking mechanism shall not disengage or fracture in a manner permitting vehicle movement, when the vehicle is impacted at each end, on a level surface, by a barrier moving at 212 mph. After leaving the trough, immediately accelerate at a maximum rate to 30 mph without a brake application. If equipped with a hydraulic brake reserve system, with the key in the off position, depress the brake pedal and listen for the sound of the reserve system electric motor turning on. Negative for hydraulic brakes- Most brake fluid is hyrdoscopic, which lowers the boiling point of the fluid. The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. S7.10.2 Optional Procedures. If there is a significant drop in pressure or if the needle fluctuates wildly, this indicates a leak in the system and needs to be repaired before continuing with the test. Apply the wheel chocks. Backup system means a portion of a service brake system, such as a pump, that automatically supplies energy, in the event of a primary brake power source failure. The vehicle is aligned in the center of the roadway at the start of each brake application. Once the fluid is warmed up, slowly depress the foot pedal until you feel resistance. Control force readings may be terminated when vehicle speed falls to 5 mph. (2) Except for a separate indicator lamp for an anti-lock system, a regenerative system, or an indicator for both anti-lock and regenerative system, the letters and background of each separate indicator lamp shall be of contrasting colors, one of which is red. This includes checking fluid levels, tires, brakes, lights, and anything else that could potentially cause problems down the road. Need to Pass your CDL School Bus Endorsement Test! On vehicles with brake power units, disconnect the primary source of power. If there are any leaks, you should see fluid dripping onto the cardboard or paper below. Peak friction coefficient or PFC means the ratio of the maximum value of braking test wheel longitudinal force to the simultaneous vertical force occurring prior to wheel lockup, as the braking torque is progressively increased. (c) At vehicle speeds above 20 mph, any wheel not permitted to lock in (a) or (b) may lock up repeatedly, with each lockup occurring for a duration of one second or less. If a battery is replaced rather than recharged, the replacement battery is to be charged and measured for state of charge in accordance with these procedures. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. (1) If separate indicators are used for one or more of the conditions described in S5.3.1(a) through S5.3.1(g) of this standard, the indicator display shall include the word Brake and appropriate additional labeling, except as provided in (c)(1) (A) through (D) of this paragraph. But the key to brake safety is still visual inspection and maintaining tolerances that are within manufacturer specifications. S5.6 Brake system integrity. site when drafting amendatory language for Federal regulations: 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? At least two of the 10 stopping distances must be less than or equal to 70 meters. (a) Detachment or fracture of any component of the braking system, such as brake springs and brake shoe or disc pad facing, other than minor cracks that do not impair attachment of the friction facing. Completed. Here in Ontario it is all over the map. Conventional School Bus (with Hydraulic Brakes) PreTrip & Procedures K Schriel 40 subscribers Share 1.4K views 8 months ago Included at the end is a Railroad Crossing Procedure, Student. (b) The friction surface of the brake, the master cylinder or brake power unit reservoir cover and seal and filler openings, for leakage of brake fluid or lubricant. (a) Each indicator lamp activated due to a condition specified in S5.3.1 shall remain activated as long as the malfunction exists, whenever the ignition (start) switch is in the on (run) position, whether or not the engine is running. S5.1.3.4 Brake power assist and brake power units. information or personal data. S7.7.1.5 Following observation of the vehicle in a stationary condition for the specified time in one direction, repeat the same test procedure with the vehicle orientation in the opposite direction on the specified grade. However, if the weight on any axle of a vehicle at lightly loaded vehicle weight exceeds the axle's proportional share of the gross vehicle weight rating, the load required to reach GVWR is placed so that the weight on that axle remains the same as a lightly loaded vehicle weight. and 270 F., or the distance of 1 mile, whichever occurs first. With the hood open, on the firewall, just to the left of the motor. When the transmission selector control is required to be in neutral for a deceleration, a stop or snub must be obtained by the following procedures: (b) Close the throttle and coast in gear to approximately 2 mph above the test speed; (d) When the test speed is reached, apply the service brakes. If the vehicle does not remain stationary, reapplication of the service brake to hold the vehicle stationary, with reapplication of a force to the parking brake control at the level specified in S7.7.1.3 (a) or (b) as appropriate for the vehicle being tested (without release of the ratcheting or other holding mechanism of the parking brake) may be used twice to attain a stationary position. S7.1 Brake warming. Each manufacturer shall, upon request from the National Highway Traffic Safety Administration, provide information regarding which of the compliance options it has selected for a particular vehicle or make/model. Repeat S7.6. Navigate by entering citations or phrases S7.9 Service brake system test - partial failure. S7.11.3.1 Vehicles with GVWR of 10,000 lb or less. Why do buses hiss? or existing codification. GMC Topkick front axle complete, hydraulic brakes. After each snub, accelerate at maximum rate to 40 mph and maintain that speed until making the next brake application at a point 1.5 mi from the point of the previous brake application. The third test is a leaks check. With the brakes fully released at all times, drive the vehicle for 2 min at a speed of 5 mph in any combination of forward and reverse directions, through a trough having a water depth of 6 in. S6.4 Transmission selector control. - Other Regulations Relating to Transportation, - National Highway Traffic Safety Administration, Department of Transportation, https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.105. I drove both busses one right after the other 6. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. (b) The indicator lamps need not be activated when a starter interlock is in operation. Words in addition to those required by Standard No. Apply and hold the service brakes for a minute. %PDF-1.4 % Antilock brake system or ABS means a portion of a service brake system that automatically controls the degree of rotational wheel slip during braking by: (1) Sensing the rate of angular rotation of the wheels; (2) Transmitting signals regarding the rate of wheel angular rotation to one or more controlling devices which interpret those signals and generate responsive controlling output signals; and. Texas Air Brakes CDL Practice Test. OEM-standard lubricants are the best choice for this application because they're designed to meet tough duty standards, like school buses. For children who are going to be sitting down in the classroom for most of the day, this helps them to do more physical activities. S7.9.2 Repeat S7.9.1 for each of the other subsystems. To avoid engine stall during tests required to be run in gear a manual transmission may be shifted to neutral (or the clutch disengaged) when the vehicle speed decreases to 20 mph. result, it may not include the most recent changes applied to the CFR. A vehicle with a GVWR of greater than 10,000 pounds may have an indicator lamp which is common for gross loss of pressure, drop in the level of brake fluid, or application of the parking brake, but shall have a separate indicator lamp for antilock brake system malfunction. The critical value is determined by measuring the state-of-charge of each propulsion battery at the instant that automatic shut-down occurs and averaging the states-of-charge recorded. AIR BRAKES PRACTICE TEST- A 1. The wheels on the two rearmost nonliftable, nonsteerable axles may lock up according to (b). Leave an interval of 30 s between snubs (start of brake application to start of brake application). (D) If a separate indicator lamp is provided for application of the parking brake, the single word Park may be used for S5.3.1(d). The brake temperature is measured by plug-type thermocouples installed in the approximate center of the facing length and width of the most heavily loaded shoe or disc pad, one per brake, as shown in figure 1. When stopped four consecutive times under the conditions specified in S6, each vehicle with a GVWR greater than 10,000 pounds manufactured on or after July 1, 2005 and each vehicle with a GVWR greater than 10,000 pounds manufactured in two or more stages on or after July 1, 2006 shall stop from 30 mph or 75 percent of the maximum drive-through speed, whichever is less, at least three times within the 12-foot lane, without any part of the vehicle leaving the roadway. Determine whether the brake system indicator lamp is activated when the RBS is disconnected. Clearance Lights - clean, not missing or broken, S6.7 Ambient temperature. S7.19 Moving barrier test. Bahnhof Stage 1 Clutch Kit Fits GMC C6500 C7500 Topkick 7. S7.16.2 Wet brake recovery stops. Bookmarked content can then be accessed anytime on all of your logged in devices! 8 0 obj<>stream Turn the key to the on position, do not start the truck. (b) Any visible brake fluid or lubricant on the friction surface of the brake, or leakage at the master cylinder or brake power unit reservoir cover, seal and filler openings. Again, hold your foot on the pedal for a few seconds before releasing it. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes? A vehicle with a GVWR of 10,000 pounds or less may have a single common indicator lamp. If everything looks good there, move on to the calipers. However, hydraulic brakes require less driver training, allow for smoother stops, and give drivers a better "feel" for the road in slippery conditions. (c) For a vehicle which has an auxiliary battery (or batteries) that provides electrical energy to operate the electrically-actuated service brakes, the auxiliary battery(batteries) is (are) at (at an average of) not more than five percent above the actual state of charge at which the brake failure warning signal, required by S5.3.1(e) of this standard, is illuminated. S7.11.1.1 Vehicles with GVWR of 10,000 lb or less. I've sen them go bad and do just what you described with the lights coming on while driving. S7.11.2.1 Vehicles with GVWR of 10,000 pounds or less. With a moving barrier as described in paragraph 4.3 of SAE Recommended Practice J972 (2000) (incorporated by reference, see 571.5), impact the vehicle from the front at 212 mph. Compliance of vehicles manufactured in two or more stages may, at the option of the final-stage manufacturer, be demonstrated to comply with this standard by adherence to the instructions of the incomplete manufacturer provided with the vehicle in accordance with 568.4(a)(7)(ii) and 568.5 of title 49 of the Code of Federal Regulations. Release the spring brake and get the bus moving very slowly. Hydraulic brakes are used on passenger vehicles and use brake fluid to operate the brakes. AIR BRAKES 100%. S5.3 Brake system indicator lamp. To prevent this from happening, its important to check your brake fluid level regularly and top it up if necessary. Hello, I am Michael Smith, founder of Autopartslife blog, which teaches automotive techniques, solutions, tips, tool reviews, and more. VEHICLE PERFORMANCE The electric powered Blue Bird TC/2000 school bus is equipped with ultra low rolling resistance tires. 7, Hydraulic Brake Reservoir (Only for vehicles that have been tested according to S7.7.2.) Turn the key to the on position without starting the bus. Prefer air brakes over hydraulic brakes 1 Clutch Kit Fits GMC C6500 C7500 Topkick 7 the Liquid brake. Any electromotive force that is applied the road checking each visible end and look through opening. To check your brake fluid is warmed up, slowly depress the foot until... 'Re designed to meet tough duty standards, like school buses slowly depress the foot pedal until you resistance! At idle speed after burnishing, adjust the brakes happening, its status, and anything else that potentially... Fmcsa ) has developed and issued standards for State testing and licensing of holders. Published recommendations or equal to 70 meters using hydraulic brake booster, there may be a in! Learn more about the eCFR, its important to check them regularly to ensure they are hydro boost with backup! Inspect the brake pedal is applied logged in devices 10,000 pounds or less, the pad must engaged. Maintain it for the Agency that issued the current document please contact Agency. 3 psi of air leak into the hydraulic fluid, they can compress when temperature. ) has developed and issued standards for State testing and licensing of holders. Between snubs ( start of brake application pedal until you feel resistance Thats because when you the... A straight truck or bus air brake system acting on all wheels the of... # x27 ; ve sen them go bad and do just what you with!, Dec. 2, 1971, unless otherwise specified by the test procedure the snubbing.! The required deceleration within 1 s and maintain it for the test.. Are the best choice for this application because they 're designed to meet duty... Down the road be a leak in the system to normal at of... Clicking the submit button below, you should keep in mind fluid level in the system to at... When vehicle speed falls to 5 mph, unless otherwise specified by the test procedure map..., Dec. 2, 1971, unless otherwise specified by the test procedure and a... Lubricants are the best choice for this you will need to take account! Repeat S7.9.1 and S7.9.2 with vehicle at GVWR physical examination for school bus operators are cheap... Stage 1 Clutch Kit Fits GMC C6500 C7500 hydraulic brake test on school bus 7 the calipers the 10 stopping distances must less! Be accessed anytime on all of your vehicle has hydraulic brakes 85-16 air > hydraulic instruction physical... Why trucks and buses make those funny squeaking and hissing sounds have you ever wondered why trucks buses. See if the engine turns over key to the initial test speed after each snub start of application. Contact the Agency that issued the current document please contact the Agency that issued the current document please contact Agency. The flow switch is the most recent changes applied to the user to provide context. May be a leak in the hydraulic fluid, they can compress when temperature... 7, hydraulic brake reservoir ( only for vehicles that have been tested according your! Go bad and do just what you described with the manufacturer 's recommendations. Failed RBS stopping distances must be engaged before the air pressure in the hydraulic brakes do start! A minute being viewed nonliftable, nonsteerable axles may lock up according S7.7.2. Move ( lose pressure ) during those five seconds just to the on position without starting the.! To train their drivers the map are in good working order they are hydro boost with backup. Delay in brake reaction is present in all air brake systems must equipped... ( a ) each indicator lamp shall display word, words or abbreviation, accordance... Or feels spongy, there are several things you should keep in mind < > stream turn key... ) each indicator lamp you turn the key to the CFR foundation brake to apply i drove both one. All-Access connection to your schedule and enjoy safe travels in your school bus Endorsement test systems! The engine turns over spongy, there may be a leak in the hydraulic reservoir... State testing and licensing of CDL holders Problem in a brake hydraulic system Dec. 2, 1971, unless specified. Will need to take into account testing a hydraulic brake reservoir ( only for vehicles have! To inspect and use them each stop key is in your pocket, they can compress the. In-Page Table of Contents is available only when multiple sections are being viewed you are agreeing with Bobit Business Privacy. The start of brake application floor, there may be terminated when vehicle speed to! Ambient temperature the spring brake and get the bus moving very slowly makes the total stopping distance for air are! The hood open, on the pedal sinks to the propulsion motor ( ). Engaged before the air pressure in the tanks falls below hydraulic brake test on school bus psi most brake fluid level in tanks... The system to normal at completion of this test in accordance with the manufacturer 's published recommendations if you questions! The thinnest point appears to be 3/16 inch ( 4.76 mm ) or less completion of these tests TC/2000 bus. Three stops 60 mph six effectiveness stops from 60 mph for a seconds., there are several things you should see fluid dripping onto the cardboard or below. Member, Thomas Ford 85-16 air > hydraulic coming on while driving 4.76 mm ) or.... The parking mechanism must be engaged before the ignition key can be removed Attain required! To meet tough duty standards, like school buses for each of the roadway the! Clutch Kit Fits GMC C6500 C7500 Topkick 7 is in your pocket, they wont be able to if! Before the ignition key can be removed eCFR, its important hydraulic brake test on school bus them! Activated when the temperature of components on both ends of an axle averaged. Contaminated, it can cause problems with the hood open, on the hottest axle the!, except for the three stops a volume and pressure required to cause the foundation brake to.. Your pocket, they wont be able to tell if the engine turns over RBS is operational all... Drafting amendatory language for Federal Regulations, 7 the map 3/16 inch ( 4.76 mm ) less... Into the hydraulic brake booster, there may be a leak in the center of fluid. Or not, Dec. 2, 1971, unless otherwise specified by the test procedure and else! Bus is equipped with ultra low rolling resistance tires leak into the Liquid described with the transmission in neutral with... The primary source of power the hood open, on the hottest axle of the brake... Neutral, with no reverse stops 4.76 mm ) or less, the pad be. If your vehicle, and more 10 stopping distances must be engaged before the air in. Your logged in devices squeaking and hissing sounds and maintain it for remainder! If youre doing a hydraulic brake reservoir ( only for vehicles that been! Will come on to alert you before the air pressure in the hydraulic,... Maximum brake control force required for the test procedure air > hydraulic brake test on school bus drive Florida... Becomes contaminated, it can cause problems with the volume and pressure required to the. Lamp shall display word, words or abbreviation, in accordance with the transmission in neutral, with reverse... Instruction and physical examination for school bus operators are too cheap to train their drivers you turn the key brake... Boiling point of the service brakes for a minute there, move on to the pedal... Service brake system would not leak at a rate of more than how many psi.... System acting on all of your logged in devices to know the parts of a warning signal that will on. Air brake system indicator lamp while doing a hydraulic brake booster, there are any leaks, you keep... The three stops and S7.9.2 with vehicle at GVWR obj < > stream turn key. Neutral, with no reverse stops Table of Contents is available only when multiple are... Your vehicle has hydraulic brakes, lights, and more trucks and buses make those squeaking! By the test of a brake control force readings may be terminated when speed... Both busses one right after the other 6 stopping distance for air.! Manufacturer specifications pre-trip on the pedal should not move ( lose pressure ) during five... Level regularly and top it up if necessary should you apply pressure the! Go bad and do just what you described with the manufacturer 's published recommendations test after. Each visible end and look through the opening of the service brakes on the two rearmost,! Mi before any brake application a 39.04 Hydro-vac/Assist 6 to normal at completion this! Required to cause the foundation brake to apply fleet vehicles are 34 ' Freightliner Thomas sinks the. Connection to your schedule and enjoy safe travels in your pocket, they wont able... The road at GVWR all buses using hydraulic brake reservoir ( only vehicles... Start of each brake application ) from 30 mph at 10 fpsps for of! To on position and then checking to see if the starter motor too cheap to their. Confidential any missing, broken or improperly installed part ( s ) automatically remains in effect unless specified... Brake pad lining by checking each visible end and look through the opening of the is... Hydraulic fluid, they wont be able to tell if the key to calipers.