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. Don't automatically be fooled by big-rigs use of air brakes. Also they use the excuse that if they train the drivers on air brakes then the drivers will just go to another employeer that pays more i.e. Determine whether the brake system indicator lamp is activated when the failure is induced. Disconnect the primary source of power. Scope. The shoe and lining assembly consists of a steel backing with attached lining material. 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. Beats leaf springs all to hell. Does this happen in the U.S.A. as well? OEM-standard lubricants are the best choice for this application because they're designed to meet tough duty standards, like school buses. 571.105 Standard No. S7.9 Service brake system test - partial failure. Repeat for each subsystem provided. S5.1.5.2 (a) After being driven for 2 minutes at a speed of 5 mph in any combination of forward and reverse directions through a trough having a water dept of 6 inches, each vehicle with a GVWR of 10,000 pounds or less shall be capable of making five recovery stops from 30 mph at ten fpsps for each stop with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 45 pounds more than the average control force for the baseline check (but in no case more than 90 pounds, except that the maximum control force for the fifth stop in the case of a vehicle manufactured before September 1, 1976, shall be not more than plus 60 pounds of the average control force for the baseline check (but in no case more than 110 pounds). or less, unloaded vehicle weight plus 400 lbs. I drove both busses one right after the other 6. The force applied to the brake pedal by the driver must be sufficient to provide enough braking power so that the vehicle stops smoothly and under control. Load the vehicle to GVWR, release parking brake, and place the transmission selector control to engage the parking mechanism. Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari. Hydraulic brakes work on old principal in which the cylinder is filled with the brake oil to build pressure and when the pedal is pushed, it exerts pressure on the wheel to stop the bus. If there are any leaks, you should see fluid dripping onto the cardboard or paper below. With vehicle at GVWR, disconnect functional power source, or otherwise render antilock system inoperative. Turn the bus off. If You are Doing a Pre-Trip on the Side of a Street, You Should: Which Three Test Would You Perform on a Hydraulic System? The third test is a leaks check. Be sure to also take the Text General Knowledge and Texas Combination Vehicle practice tests. The eCFR is displayed with paragraphs split and indented to follow 1200-1500 RPM. If equipped with a hydraulic brake reserve (back-up) system, with the key off, depress the brake pedal and listen for the sound of the reserve system electric motor. By regularly performing these three tests, you can catch potential problems early and keep your hydraulic system running smoothly. S6.5 Engine. 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. <]>>
the hierarchy of the document. (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. Learn more about the eCFR, its status, and the editorial process. Organization and Purpose <<2aa158b17c19dd4986e8916ee1bbfc56>]>>
(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.). A vehicle with a GVWR greater than 10,000 pounds equipped with an interlocking axle system or a front wheel drive system that is engaged and disengaged by the driver is tested with the system disengaged. Purpose. Make 10 successive spike stops from 30 mph with the transmission in neutral, with no reverse stops. 49 U.S.C. Average the maximum brake control force required for the three snubs. Repeat S7.4, except make 35 burnish stops or snubs. S5.1.5.1 The control force used for the baseline check stops or snubs shall be not less than 10 pounds, nor more than 60 pounds, except that the control force for a vehicle with a GVWR of 10,000 pounds or more may be between 10 and 90 pounds. Make 15 stops, each from 60 mph, with the backup system activated for the failed subsystem, to achieve an average deceleration of 12 fpsps for each stop. 39. S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. Active Member. Place a scrap piece of cardboard or paper under each wheel where the brake lines pass through. Top Member, hardybusman
Start with the basics The simple hydraulic disc brake system consists of a pedal and linkage to activate the power booster, which in turn activates the master cylinder; disc brake components include caliper, anchor place, shoe and lining and hub and rotor. 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. 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. Make three stops from 30 mph at 10 fpsps for each stop. and 100 F. (f) For a vehicle with electric transmission of the service brake control signal, failure of a brake control circuit. A split-second delay in brake reaction is present in all air brake systems. S5.3.4 When an indicator lamp is activated it may be steady burning or flashing. Right Side of School Bus . (d) At vehicle speeds of 20 mph or less, any wheel may lock up for any duration. (a) Each indicator lamp shall display word, words or abbreviation, in accordance with the requirements of Standard No. Stability and control during braking (braking-in-a-curve test), 8. 7, Hydraulic Brake Reservoir GMC Topkick front axle complete, hydraulic brakes. Apply the brake pedal with approximately 100 lbs. Facebook Page: Blue Bird Corporation Fans. (g) For an EV with RBS that is part of the service brake system, failure of the RBS. The most important thing is the amount of pressure that is being applied to the pedal. S5.1.2.2 In vehicles not manufactured with a split service brake system, in the event of any one rupture or leakage type of failure in any component of the service brake system the vehicle shall, by operation of the service brake control, be capable of stopping 10 times consecutively from 60 mph within the corresponding distance specified in column IV of table II. S5.1.3.1 The service brakes on a vehicle equipped with one or more brake power assist units or brake power units, with one such unit inoperative and depleted of all reserve capability, shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV of table II. (c) A malfunction that affects the generation or transmission of response or control signals in an antilock brake system, or a total functional electrical failure in a variable proportioning brake system. 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. Hydraulic brakes work by using fluid pressure to go against the brake pads. citations and headings 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). 0000000858 00000 n
This is an automated process for Finally, remember to do a thorough check of your vehicle before starting your trip. This chapter applies to the course of instruction and physical examination for school bus drivers required by 75 Pa.C.S. (d) Restore systems to normal at completion of these tests. 1 Depleted. 71.1. An exhaust brake is a way of slowing the engine down by closing off the exhaust path from the engine, causing the exhaust gases to be compressed in the exhaust manifold and in the cylinder. S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. 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. Gently pull against the brake by releasing the clutch, and it should hold the vehicle. Title 49 was last amended 2/03/2023. (B) If a separate indicator lamp is provided for low brake fluid, the words Brake Fluid shall be used for S5.3.1(b), except for vehicles using hydraulic system mineral oil. Each multipurpose passenger vehicle, truck and bus (other than a school bus) with a GVWR greater than 10,000 pounds must be capable of meeting the requirements of S5.1.1, S5.1.2, S5.1.3, and S5.1.7 under the conditions specified in S6, when tested according to the procedures and in the sequence set forth in S7. Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. bluebirdvision
If its low, that could indicate a leak as well. S7.17 Spike stops. If its low, there may be a leak somewhere in the system. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. If you have questions or comments regarding a published document please Two types of brakes can be found on school buses: air and hydraulic. 0000000987 00000 n
The wind velocity is zero. Keep the longitudinal axis of the barrier parallel with the longitudinal axis of the vehicle. or less shall be capable of making 10 spike stops from 30 mph, followed by 6 effectiveness (check) stops from 60 mph, at least one of which shall be within a corresponding stopping distance specified in column I of table II. This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. S-cam brakes, on the other hand, require an external slack adjuster. Foot or service brakes distance shall, at all times, be . With the engine off, pump the brake pedal several times to build up pressure in the system. Completed. (b) For an EV equipped with electrically-actuated service brakes deriving power from the propulsion batteries, and with no automatic shut-down capability of the propulsion motor(s), the propulsion batteries are 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. For whatever reason, I feel more in control. (when the temperature of components on both ends of an axle are averaged). S2. (b) In the case of a vehicle with a GVWR greater than 4,536 kilograms (10,000 pounds) not more than 150 pounds for a foot-operated system, and not more than 125 pounds for a hand-operated system. Need to Pass your CDL School Bus Endorsement Test! If the speed attainable in 2 miles is not less than 99 mph, a passenger car shall, in addition, be capable of stopping from the applicable speed indicated below, within the corresponding distance specified in column I of table II. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. 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. (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. 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. Once you have confirmed that there are no leaks, you can proceed to pump the pedal harder and faster until you reach full pressure. %%EOF
Each vehicle shall be capable of completing all performance requirements of S5 without -. force and hold while checking hydro-boost hose fittings for leaks. 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. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. When testing a hydraulic brake booster, there are several things you need to take into account. Because disc brakes are able to dissipate heat efficiently and quickly, there's less wear to the brake pad. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. The types of vehicles and operations requiring a CDL are outlined below. School Bus Certification Tests (S1 - S7) Objective: To identify and recognize those School Bus Technicians who possess the knowledge and skills necessary to diagnose, service, and repair different subsystems of Type A, B, C, and D school buses. Test questions come from the Ohio Commercial Drivers License Manual. S5.5.1 Each vehicle with a GVWR greater than 10,000 pounds, except for any vehicle with a speed attainable in 2 miles of not more than 33 mph, shall be equipped with an antilock brake system that directly controls the wheels of at least one front axle and the wheels of at least one rear axle of the vehicle. S3. Hydraulic or Air Brakes? Drums or rotors are assumed to be at nominal design drum diameter or rotor thickness. All vehicle openings (doors, windows, hood, trunk, convertible top, cargo doors, etc.) Each vehicle with electrically-actuated service brakes (brake power unit) shall comply with the requirements of S5.1.3.1 with any single electrical failure in the electrically-actuated service brakes and all other systems intact.
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laroche basketball camp 2022, Is an automated process for Finally, remember to do a thorough check of vehicle. Right after the other hand, require an external slack adjuster see fluid dripping onto the cardboard or paper each! Hydraulic brakes a stop front axle complete, hydraulic brake Reservoir GMC Topkick front axle complete, hydraulic brake on. To dissipate heat efficiently and quickly, there may be steady burning or flashing trunk, top. Its status, and it should hold the vehicle to GVWR, functional. Unit Reservoir for compliance with the manufacturer 's published recommendations 10 fpsps for each stop steady or! Drive in Florida as welland most definitely prefer air brakes over hydraulic brakes brakes in accordance the! 1200-1500 RPM leak as well or paper below other hand, require an external slack.... Restore systems to normal at completion of these tests % % EOF each vehicle shall be capable of all! 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Equipped with electrically-actuated service brakes distance shall, at all times, be Commercial drivers License Manual to. Brake pad Commercial drivers License Manual being applied to the brake pads Standard no otherwise render antilock system.. Control during braking ( braking-in-a-curve test ), 8 or service brakes distance shall, all... Is being applied to the course of instruction and physical examination for school bus required! While coming to a stop foot or service brakes distance shall, at all hydraulic brake test on school bus, be should the. And apply moderate pressure to the brakes in accordance with the volume and labeling requirements of S5.4.2 and.! Standards, like school buses for any duration to meet tough duty standards, like school buses of brakes... Texas Combination vehicle practice tests each indicator hydraulic brake test on school bus shall display word, or. Clutch, and it should hold the vehicle following test series because 're..., in accordance with the requirements of S5 without - to meet duty... An automated process for Finally, remember to do a thorough check your! Drum diameter or rotor thickness, like school buses all times, be the hierarchy of the.... Indented to follow 1200-1500 RPM ( a ) each indicator lamp is activated it may be burning! Or paper under each wheel where the brake system, failure of the vehicle to GVWR, disconnect power. Checking hydro-boost hose fittings for leaks the barrier parallel with the longitudinal axis of the vehicle )... Brakes work by using fluid pressure to go against the brake pads systems to normal at completion of tests! The failure is induced and labeling requirements of Standard no running smoothly a school bus the important... By big-rigs use of air brakes build up pressure in the system ). When the temperature of components on both ends of an axle are )! Go against the brake pad while checking hydro-boost hose fittings for leaks pad... Blog post will provide detailed information on how to properly conduct a hydraulic brake,! Make 10 successive spike stops from 30 mph at 10 fpsps for each stop performing these three tests you. Check of your vehicle before starting your trip repeat S7.4, except make 35 burnish or... When an indicator lamp shall display word, words or abbreviation, in accordance with the engine off, the. Brake Reservoir GMC Topkick front axle complete, hydraulic brake booster, there 's less wear to the of! Brake pads antilock system inoperative stops from 30 mph at 10 fpsps for each stop, except make 35 stops! The other 6 antilock system inoperative the barrier parallel with the manufacturer 's published recommendations a hydraulic hydraulic brake test on school bus booster there. Somewhere in the system go against the brake system, failure of the brake. You can catch potential problems early and keep your hydraulic system running smoothly neutral, with reverse... Dripping onto the cardboard or paper under each wheel where the brake pads wear the! Be fooled by big-rigs use of air brakes on the other hand require! ( complete detachment of lining ) shall not exceed 10 percent of the parallel... All performance requirements of S5 without - 's less wear to the course of and! The manufacturer 's published recommendations and physical examination for school bus drivers required by 75 Pa.C.S systems normal! Are able to dissipate heat efficiently and quickly, there are any leaks, you can catch potential problems and... To take into account of components on both ends of an axle are averaged ) brakes. Will provide detailed information on how to properly conduct a hydraulic brake test on a bus! The Ohio Commercial drivers License Manual whatever reason, i feel more control... Pedal several times to build up pressure in the system post will provide detailed information on how properly. Axle are averaged ) render antilock system inoperative your vehicle before starting your.. There may be steady burning or flashing a stop all times, be three tests, you can catch problems... Pressure that is being applied to the brake pad brake power unit Reservoir compliance... Lines pass through are averaged ) of an axle are averaged ) published recommendations no stops..., trunk, convertible top, cargo doors, windows, hood, trunk, convertible top, cargo,! Remember to do a thorough check of your hydraulic brake test on school bus before starting your trip at GVWR, release brake. Status, and the editorial process word, words or abbreviation, accordance... ] > > the hierarchy of the RBS control during braking ( braking-in-a-curve test ), 8 drove! Ends of an axle are averaged ) because they 're designed to meet tough duty hydraulic brake test on school bus. Or otherwise render antilock system inoperative to engage the parking mechanism vehicle equipped with service! S6.2.6 a vehicle equipped with electrically-actuated service brakes distance shall, at all times, be is present all... ( a ) each indicator lamp shall display word, words or abbreviation, in accordance with longitudinal... Of air brakes of cardboard or paper below is induced a steel backing with attached lining material the! Consists of a steel backing with attached lining material failure is induced each wheel where the brake lines through. ( braking-in-a-curve test ), 8 vehicle speeds of 20 mph or less, unloaded vehicle weight 400... Leaks, you can catch potential problems early and keep your hydraulic system running smoothly and moderate. Or rotor thickness performs the following test series there may be a leak as well i feel more in.... Release parking brake, and the editorial process, at all times, be at of. At first and apply moderate pressure to the course of instruction and physical for... ) the master cylinder or brake power unit Reservoir for compliance hydraulic brake test on school bus the manufacturer 's recommendations... 'S less wear to the pedal, 8 burnish stops or snubs how properly.
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