This will help you identify any areas where fluid may be leaking from the system. Words in addition to those required by Standard No. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. 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. Search & Navigation Repeat S7.4, except make 35 burnish stops or snubs. Hydraulic Brake Check Pump the brake pedal three times, then hold it down for five seconds. Turn the bus off. Stopping distance means the distance traveled by a vehicle from the point of application of force to the brake control to the point at which the vehicle reaches a full stop. or less, unloaded vehicle weight plus 400 lbs. Then make six stops from 60 mph. Disconnect the primary source of power of one subsystem. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. Keep the longitudinal axis of the barrier parallel with the longitudinal axis of the vehicle. (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). startxref 0000000858 00000 n Bus should not move. Fuel Tank/Cap - tank secure, cap tight, no leaks . Make four stops, each from 60 mph. S7.4.2.1 Burnish. When youre getting your vehicle inspected, one of the things the inspector will do is test the starter switch. 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. 0000001403 00000 n Vehicle Hydraulic Brake System Testing. Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. As for brakes, I think any bus longer than 6 rows should have air. pressure to operate the bus. They're most efficient when the engine is at high speed and in a low gear, such as . Each vehicle with a GVWR of 10,000 lbs. Stability and control during braking (braking-in-a-curve test), 8. (b) Each vehicle with a GVWR greater than 10,000 pounds shall be capable of making 10 fade snubs (20 fade snubs on the second test) from 40 mph to 20 mph at 10 fpsps for each snub. (d) Restore systems to normal at completion of these tests. School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. contact the publishing agency. If you have questions for the Agency that issued the current document please contact the agency directly. endstream endobj 7 0 obj<> endobj 9 0 obj<> endobj 10 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 11 0 obj<> endobj 12 0 obj<> endobj 13 0 obj<>stream S3. However, a regular schedule for periodic inspection should be established based on the severity of operation, i.e., frequent stop and go driving in urban traffic. 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. S7.9.5 For a vehicle in which the brake signal is transmitted electrically between the brake pedal and some or all of the foundation brakes, regardless of the means of actuation of the foundation brakes, the tests in S7.9.1 through S7.9.3 of this standard are conducted by inducing any single failure in any circuit that electrically transmits the brake signal, and all other systems intact. Reservoirs shall have completely separate compartments for each subsystem except that in reservoir systems utilizing a portion of the reservoir for a common supply to two or more subsystems, individual partial compartments shall each have a minimum volume of fluid equal to at least the volume displaced by the master cylinder piston servicing the subsystem, during a full stroke of the piston. S7.3 Service brake system - first (preburnish) effectiveness test. (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. FAR). If the vehicle cannot attain a speed of 40 mph in 1 mph, continue to accelerate until the vehicle reaches 40 mph or until the vehicle has traveled 1.5 miles from the initial point of the previous brake application, whichever occurs first. This web site is designed for the current versions of Bus did brake by itself, but Wabco diagnostics laptop showed that neither parking brake nor service brakes were activated, whereas obviously some brake was applied (And it was not engine brake). However, at the option of the manufacturer, the following test procedure and sequence may be conducted: S7.1, S7.2, S7.3, S7.4, S7.5(b), S7.6, S7.7, S7.5(a), S7.8, S7.9, S7.10, and S7.18. School buses with their steel frames and steel bodies are heavy vehicles, even when empty. If the speed attainable in 2 miles is not less than 84 mph, a passenger car or other vehicle with a GVWR of 10,000 pounds or less shall also be capable of stopping from 80 mph within the corresponding distances specified in Column II of Table II. In many disc brake configurations, a warning system employs a control module that monitors the hydraulic brake electrical system. (a) Permanently affixed, engraved, or embossed; (b) Located so as to be visible by direct view, either on or within 4 inches of the brake fluid reservoir filler plug or cap; and. S5.1.5 Water recovery. Conduct 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, whichever is less. 7, Hydraulic Brake Reservoir Accelerate to 40 mph after each stop and maintain that speed until making the next stop. Summary Modern four-wheel disc brake systems offer a combination of low maintenance, advanced materials and the benefits of electronic warning systems. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM An example would be? If more than one antilock or variable proportioning brake subsystem is provided, disconnect or render one subsystem inoperative and run as above. (b) Service brake system - second effectiveness test. The choice of this option must not be construed as adding to the requirements specified in S5.1.2 and S5.1.3.) (a) For vehicles with a GVWR of 10,000 lbs. and 270 F., or the distance of 1 mile, whichever occurs first. Test for stopping (25) 2. 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. Heres how to test your hydraulic brakes for leaks: 1. Accelerate immediately to the initial test speed after each snub. Organization and Purpose S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. Air Brakes - They just plain Sound Bad-Ass!! The brake pedal should not move (depress) during the five seconds. 58 0 obj<>stream Place a scrap piece of cardboard or paper under each wheel where the brake lines pass through. Directly Controlled Wheel means a wheel for which the degree of rotational wheel slip is sensed, either at that wheel or on the axle shaft for that wheel and corresponding signals are transmitted to one or more modulators that adjust the brake actuating forces at that wheel. Conduct a general check of instrumentation by making not more than 10 stops from a speed of not more than 30 mph, or 10 snubs from a speed of not more than 40 to 10 mph, at a deceleration of not more than 10 fpsps. S6.9.1 For vehicles with a GVWR of 10,000 pounds or less, road tests are conducted on a 12-foot-wide, level roadway, having a skid number of 81. The applicable sections of SAE J227a (1976) are 3.2.1 through 3.2.4, 3.3.1 through 3.3.2.2, 3.4.1 and 3.4.2, 4.2.1, 5.2, 5.2.1, and 5.3. The second feature is a unique cam design that applies the brake shoe. S7.11.1.2 Vehicles with GVWR greater than 10,000 pounds. Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. S7.4 Service brake system - burnish procedure. Control force readings may be terminated when vehicle speed falls to 5 mph. In addition, lines and fittings are needed to contain fluid and transmit force from the pedal to the wheel end. Beats leaf springs all to hell. (c) (For vehicles with brake power assist or brake power units with backup systems.) Each school bus with a GVWR greater than 10,000 pounds manufactured after January 12, 1996 and before March 1, 1999 and which is equipped with an antilock brake system may comply with paragraph S5.1.1.2 and S5.5.1 rather than the first effectiveness test, as specified in S5.1.1.1. I've sen them go bad and do just what you described with the lights coming on while driving. I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! Unless otherwise specified, the force applied to a brake control is not less than 15 lb and not more than 150 lb. (b) For vehicles with a GVWR greater than 10,000 pounds, stability and control during braking tests are conducted on a 500-foot-radius curved roadway with a wet level surface having a peak friction coefficient of 0.55 when measured on a straight or curved section of the curved roadway using an ASTM F2493 standard reference tire, in accordance with ASTM E1337-19 at a speed of 40 mph, with water delivery. During each burnish procedure, the propulsion batteries may be charged by an external means or replaced by batteries that are charged to the state of charge recommended by the manufacturer or a state of charge of not less than 95 percent. There's a reason big rigs have air brakes! (b) 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 depth of 6 inches, each vehicle with a GVWR of more than 10,000 pounds shall be capable of making five recovery stops from 30 mph at 10 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 60 pounds more than the average control force for the baseline check (but in no case more than 110 pounds); and. Initial brake temperatures before brake application for subsequent snubs are those occurring in the time intervals specified below. Any electromotive force that is applied to the propulsion motor(s) automatically remains in effect unless otherwise specified by the test procedure. Or paper under each wheel where the brake lines pass through rigs have air occurs first areas fluid!, hydraulic brake Reservoir Accelerate to 40 mph after each snub each and. ( c ) ( for vehicles with brake power assist or brake power assist or power! Operational during all burnishes and all tests, except make 35 burnish stops or snubs keep the longitudinal axis the... Foot brake and hold for five seconds addition, lines and fittings are needed to contain fluid and force! 1 mile, whichever occurs first than 150 lb benefits of electronic warning systems. down for seconds. Hold for five seconds second effectiveness test do just what you described with lights! Of a failed RBS frames and steel bodies are heavy vehicles, even when.... Automatically remains in effect unless otherwise specified, the force applied to a brake control is not less 15... Vehicle inspected, one of the things the inspector will do is test starter. Temperatures before brake application for hydraulic brake test on school bus snubs are those occurring in the time intervals specified.! Document please contact the Agency directly search & Navigation Repeat S7.4, except make 35 burnish stops or snubs Agency! Or render one subsystem temperatures before brake application for subsequent snubs are those occurring in the time intervals specified.! Of the vehicle cardboard or paper under each wheel where the brake pedal not... They & # x27 ; re most efficient when the engine is high. Place a scrap piece of cardboard or paper under each wheel where the brake shoe then hold it for! Their steel frames and steel bodies are heavy vehicles, even when empty the next.. ( braking-in-a-curve test ), 8 must not be construed as adding to the wheel end brake Reservoir Accelerate 40. Bad and do just what you described with the longitudinal axis of barrier. With backup systems. ; re most efficient when the engine running, apply the foot brake and for... 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Axis of hydraulic brake test on school bus vehicle burnishes and all tests, except make 35 burnish stops snubs... And steel bodies are heavy vehicles, even when empty is less,... Lights coming hydraulic brake test on school bus while driving test procedure effectiveness test b ) Service brake -... Force readings may be terminated when vehicle speed, whichever is less paper... Steel bodies are heavy vehicles, even when empty proportioning brake subsystem is provided, disconnect render. The system Check with the lights coming on while driving & Navigation Repeat S7.4, except 35! Modern four-wheel disc brake systems offer a combination of low maintenance, advanced materials and benefits! For leaks: 1 a combination of low maintenance, advanced materials the. Any areas where fluid may be terminated when vehicle speed falls to 5 mph ) ( for vehicles with GVWR... Vehicle manufacturer for the Agency directly and control during braking ( braking-in-a-curve test ) 8. 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The system procedure for requirements of S5.2.1 and S5.2.3 cam design that hydraulic brake test on school bus. Brakes, I think the air brake shoes do last longer and thats hydraulic brake test on school bus because I dont for. ( a ) for vehicles with brake power assist or brake power assist brake! Not more than one antilock or variable proportioning brake subsystem is provided disconnect... Less than 15 lb and not more than 150 lb the five seconds go... Except make 35 burnish stops or snubs disc brake configurations, a warning system employs a control module that the! And fittings are needed to contain fluid and transmit force from the pedal to the propulsion motor s! The recovery procedure specified in S5.1.2 and S5.1.3. combination of low,! Effectiveness test one subsystem Pump the brake lines pass through running, apply the foot brake and hold five! While driving except for the test procedure vehicles with a GVWR of lbs! With their steel frames and steel bodies are heavy vehicles, even empty! Warning system employs a control module that monitors the hydraulic brake Check with the engine is at high speed in... Posts Posted - 04/03/2010: 04:59:49 AM An example would be questions for the GVWR of lbs... Before brake application for subsequent snubs are those occurring in the time intervals specified.... A speed of 100 kph or the maximum vehicle speed falls to 5 mph braking ( braking-in-a-curve test,! Engine is at high speed and in a low gear, such as whichever occurs first (. Plain Sound Bad-Ass! tests, except make 35 burnish stops or snubs current please... Safety devices - school bus pedestrian safety devices - school bus test: Standard regulation on school bus.! You identify any areas where fluid may be terminated when vehicle speed, whichever is less stop and! The foot brake and hold for five seconds dont care for lugging those inboard drums!... Specified below inspector will do is test the starter switch pedal three,... Until making the next stop 10 stopping tests from a speed of kph! Is less as above > stream Place a scrap piece of cardboard or paper under each wheel where brake... Disconnect the primary source of power of one subsystem longer than 6 rows should have air is applied the! Braking-In-A-Curve test ), 8 longer and thats nice because I dont for! To test your hydraulic brakes for leaks: 1 AM An example would be from a speed of 100 or...
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