See this. S7.9.1 With the vehicle at lightly loaded vehicle weight or at the manufacturer's option for a vehicle with a 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, alter the service brake system to produce any one rupture or leakage type of failure, other than a structural failure of a housing that is common to two or more subsystems. 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. (b) The indicator lamps need not be activated when a starter interlock is in operation. S5.1.3.5 Electric brakes. Repeat the test, impacting the vehicle from the rear. Clearance Lights - clean, not missing or broken, S6.2.1 The state of charge of the propulsion batteries is determined in accordance with SAE Recommended Practice J227a (1976) (incorporated by reference, see 571.5). Periodic adjustment to manufacturer specifications is required. To pass, applicants must answer 40 questions correctly. It's also important to lubricate the rails that the caliper moves upon to ensure consistent operation and also to guard against contamination by rust and dirt. 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. If the pedal sinks down, this indicates that there is a leak in the system and it needs to be repaired before use. Its like asking people what is better Chevy or Ford. This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. Disc brake systems use a two-piston sliding caliper at the steer axle and drive axle; older buses may utilize a single-piston caliper. 1509 (relating to qualifications . 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. (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. An auxiliary means may be used to accelerate an EV to test speed. Then apply firm pressure to the pedal and hold for five seconds. First, always put your safety first and be aware of your surroundings. S5.4.2 Reservoir capacity. This is because there is more pressure being placed on the brakes when there is more weight on the trailer. Bookmark +. Apply the brake control as quickly as possible. For vehicles equipped with more than one brakepower assist or brakepower unit, conduct tests of each in turn. Restore system to normal at completion of this test. 0000000016 00000 n
S6.6 Vehicle openings.
(c) (For vehicles with brake power assist or brake power units with backup systems.) a. Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. The wind velocity is zero. Make four stops if the vehicle is equipped with a split service brake system, or 10 stops if the vehicle is not so equipped, each from 60 mph, by a continuous application of the service brake control. S7.11.2.2 Vehicles with GVWR greater than 10,000 lb. Hydraulic Brake Fluids: Standard regulation on hydraulic brake fluids. I think it's a toss up, as a driver I've driven more hydraulic than air brakes. Release the spring brakes. See Fig. Control force readings may be terminated when vehicle speed falls to 5 mph. S5.2.1. Disconnect the primary source of power. I'll tell you soon.. S7.9 Service brake system test - partial failure. (This test need not be run if the option in S7.10.2 is selected.) Each school bus with a GVWR greater than 10,000 pounds must be capable of meeting the requirements of S5.1.1 through S5.1.5, and S5.1.7 under the conditions specified in S6, when tested according to the procedures and in the sequence set forth in S7. Navigate by entering citations or phrases 41. This warning indicator shall, instead of meeting the requirements of S5.3.2 through S5.3.5, activate (while the vehicle remains capable of meeting the requirements of S5.1.2.2 and the ignition switch is in the on position) a continuous or intermittent audible signal and a flashing warning light, displaying the words STOP-BRAKE FAILURE in block capital letters not less than one-quarter of an inch in height. Medium-duty vehicles (buses, straight trucks) can be ordered with either air or hydraulic. You also need to make sure that there is no air in the system, as this can cause problems with braking performance. On each vehicle with a GVWR greater than 10,000 pounds but not greater than 19,500 pounds and motor homes with a GVWR greater than 10,000 pounds but not greater than 22,500 pounds manufactured before March 1, 2001, the antilock brake system may also directly control the wheels of the rear drive axle by means of a single sensor in the driveline. xb````` After each stop (except the last), accelerate the vehicle immediately at a maximum rate to a speed of 30 mph and begin the next stop. S7.7.1.6 Check the operation of the parking brake application indicator required by S5.3.1(d). Use only ______ fluid from a sealed container. (Inserting the recommended type of brake fluid as specified in 49 CFR 571.116, e.g., DOT 3). S7.8 Service brake system test - lightly loaded vehicle (third effectiveness) test. Skoolie Google Click Here to Login 2 Thread Tools Display Modes Page 1 of 2 1 2 > pesky brake lines from master cylinder | Hydraulic Brake Lines However, if everything seems normal, congratulations your hydraulic brakes are in good shape! (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). 3. While your buses are here, our mechanics can: Inspect the condition of the brake lining. Hydraulic or Air Brakes? With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. A straight truck or bus air brake system would not leak at a rate of more than how many PSI per . S5.3 Brake system indicator lamp. 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. The first test is a pressure check. Listen for any possible leaks. Bus should stop in straight line without pulling to one side or the other. Not just because I've been in the truck world too long either. Each vehicle shall be manufactured with a parking brake system of a friction type with a solely mechanical means to retain engagement, which shall under the conditions of S6, when tested according to the procedures specified in S7, meet the requirements specified in S5.2.1, S5.2.2, or S5.2.3 as appropriate, with the system engaged -, (a) In the case of a vehicle with a GVWR of 4,536 kilograms (10,000 pounds) or less, with a force applied to the control not to exceed 125 pounds for a foot-operated system and 90 pounds for a hand-operated system; and. If its low, top it off and bleed the brakes according to the manufacturers instructions. Each vehicle shall have a brake system indicator lamp or lamps, mounted in front of and in clear view of the driver, which meet the requirements of S5.3.1 through S5.3.5. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. S6.13 Control forces. (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. 2 - 3 B. An example would be? 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. 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. 0000000987 00000 n
Each vehicle shall be capable of meeting all the applicable requirements of S5 when tested according to the procedures and sequence set forth below, without replacing any brake system part or making any adjustments to the brake system other than as permitted in the burnish and reburnish procedures and in S7.9 and S7.10. easy to follow sequencing for each section of the vehicle;. S5.2.2 A vehicle of a type described in S5.2.1 at the option of the manufacturer may meet the requirements of S5.2.2.1, S5.2.2.2, and S5.2.2.3 instead of the requirements of S5.2.1 if: (a) The vehicle has a transmission or transmission control which incorporates a parking mechanism, and. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. You dont want to get caught taking too long and getting a ticket. Start your practice test now. (a) The service brakes shall be capable of stopping each vehicle with a GVWR of less than 8,000 pounds, and each school bus with a GVWR between 8,000 pounds and 10,000 pounds in four effectiveness tests within the distances and from the speeds specified in S5.1.1.1, S5.1.1.2, S5.1.1.3, and S5.1.1.4. 58 0 obj<>stream
(A) If a separate indicator lamp is provided for gross loss of pressure, the words Brake Pressure shall be used for S5.3.1(a). Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). Two types of brakes can be found on school buses: air and hydraulic. Visually inspect the brake pad lining by checking each visible end and look through the opening of the caliper. 117. . Remove old certificate. Control force readings may be terminated when vehicle speed falls to 5 mph. I Vote Air Brakes, I agree about that they lock up, and you can't move, instead of that I can't stop. 49 CFR 172.101 Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. School Bus 101 9.47K subscribers Subscribe 28K views 5 years ago In a hydraulic brake system, when the brake pedal is pressed, a pushrod exerts force on the piston (s) in the master. trailer parking brake on. S5.1 Service brake systems. If the power assist fail on a hydraulic brake system A. you will NOT be able to stop the bus B. 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. 1200-1500 RPM. (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. 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. xref
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. S5.2.2.2 The vehicle's parking brake, with the parking mechanism not engaged, shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. The vehicle used for this test need not be the same vehicle that has been used for the braking tests. This questions appears in the following tests: Colorado Double District Of Columbia Class A Knowledge Test Illinois Passenger . Make four stops in the lightly-loaded weight condition specified in S5.1.7. Great prices on 1009 aftermarket and OEM GMC C6500 Topkick auto parts. Is no air in the following tests: Colorado Double District of Columbia Class a test... 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