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. Great for long drives. 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. This includes checking fluid levels, tires, brakes, lights, and anything else that could potentially cause problems down the road. The force required for actuation of a hand-operated brake system shall be measured at the center of the hand grip area or at a distance of 112 inches from the end of the actuation lever, as illustrated in Figure II. Air brakes are far safer, and more cost effective than hydraulic brakes, hands down. S7.8 Service brake system test - lightly loaded vehicle (third effectiveness) test. 4. a. Fluid pressure b. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel . A. This consists of a warning signal that will come on to alert you before the air pressure in the tanks falls below 60 psi. Park your car on level ground and set the parking brake. Repeat S7.6. Then, for a vehicle with a GVWR of 10,000 pounds or less, make four stops from 80 mph if the speed attainable in 2 miles is not less than 84 mph. (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. Visually inspect the brake pad lining by checking each visible end and look through the opening of the caliper. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). Make 5 stops from 60 mph at 15 fpsps followed by 5 stops at the maximum attainable deceleration between 5 and 15 fpsps for each stop. - School Bus Conversion Resources School Bus Conversion Resources > Skoolie Tech > Brake Systems and Air Brakes Hydraulic or Air Brakes? Next, check the brake hoses for any leaks or damage. S5.1.2.1 In vehicles manufactured with a split service brake system, in the event of a rupture or leakage type of failure in a single subsystem, other than a structural failure of a housing that is common to two or more subsystems, the remaining portion(s) of the service brake system shall continue to operate and shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV of table II. However, the options provided in S5.3.1(a) shall not apply to a vehicle manufactured without a split service brake system; such a vehicle shall, to meet the requirements of S5.3.1(a), be equipped with a malfunction indicator that activates under the conditions specified in S5.3.1(a)(4). I am all for air brakes. Your email address will not be published. Wear of the service brake must be compensated for by means of a system of automatic adjustment. For an EV, the speed attainable in 2 miles is determined with the propulsion batteries at a state of charge of not less than 95 percent at the beginning of the run. Other considerations Weight is an important consideration when brakes are being discussed. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. Each vehicle with a GVWR of 10,000 lbs. The caliper attaches to and slides within an anchor plate or bracket. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. The first test is a pressure check. No recharging is allowed after start of test. If you have comments or suggestions on how to improve the www.ecfr.gov website or have questions about using www.ecfr.gov, please choose the 'Website Feedback' button below. (E) If a separate indicator is used for the regenerative brake system, the symbol RBS may be used. 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. xb```f``cf`ax ?cz4%2TgFMSvk[U __@mbn*4z0|dr20dL@l
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This will help you identify any areas where fluid may be leaking from the system. I have been a medium duty bus tech for decades. This blog post will provide detailed information on how to properly conduct a hydraulic brake test on a school bus. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. Linings are assumed adjusted for normal operating clearance in the released position. The interval from the start of one service brake application to the start of the next shall be either the time necessary to reduce the initial brake temperature to between 230 F. learn more about the process here. 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. 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. Test questions come from the Ohio Commercial Drivers License Manual. Heres how to test your hydraulic brakes for leaks: 1. S7.4.2 Vehicles with GVWR greater than 10,000 pounds. Wheel lockup means 100 percent wheel slip. a. Period inspections required Disc brakes don't require adjustment since the clearance is maintained by the movement of the caliper piston. In the case of vehicles burnished in accordance with S7.4.2.1(a) of this section, reburnish the vehicle by making 35 snubs from 60 to 20 mph, but if the hottest brake temperature reaches 500 F 50 F, make the remainder of the brake applications from the highest snub condition listed in Table IV that will maintain the hottest brake temperature at 500 F 50 F. In Iowa anything over 66 passenger has to be air brakes. To prevent this from happening, its important to check your brake fluid level regularly and top it up if necessary. One feature is a completely internal adjustment system which is designed to continually keep the brake in proper adjustment. Learn more about the eCFR, its status, and the editorial process. (g) For an EV with RBS that is part of the service brake system, failure of the RBS. S7.4.2.1 Burnish. S7.9 Service brake system test - partial failure. - 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. GMC C5500 Topkick A/C Compressor Clutch Parts. Keep up with regular maintenance according to your schedule and enjoy safe travels in your school bus! Turn off engine and DISARM No Child . 16. 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. (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. xref
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. An auxiliary means may be used to accelerate an EV to test speed. S7.7 Parking brake test. S5.3 Brake system indicator lamp. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. YOU must set the parking brake immediately C. your service brakes will still work, using extra leg power 17. Make four stops in the lightly-loaded weight condition specified in S5.1.7. 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. S5.1.4.1 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 pounds and 90 pounds. (b) In the case of a vehicle with a GVWR greater than 4,536 kilograms (10,000 pounds), with a force applied to the control not to exceed 150 pounds for a foot-operated system and 125 pounds for a hand-operated system. S5.1.1.3 In the third effectiveness test the vehicle shall be capable of stopping at lightly loaded vehicle weight from 60 mph within the corresponding distance specified in column III of table II. It is in keeping with a concern for safety that the four-wheel disc brake system has become the brake of choice for the school bus industry. Your email address will not be published. easy to follow sequencing for each section of the vehicle;. S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. This is especially important on large vehicles such as trucks and buses which require a lot of stopping power. I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! DewinterizeYour RV: A Complete Checklist. If the hose fittings do not leak go to step 5. Get it fixed before driving. S6.14 Special drive conditions. The shoe and lining assembly consists of a steel backing with attached lining material. Fill to this level. This self-paced FAST course gives you: EASY step-by-step instructions how to conduct a pre-trip inspection; precise path of travel around the vehicle;. The types of vehicles and operations requiring a CDL are outlined below. Taking the bus to school involves walking to the bus stop. 39. 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. Air pressure will drop, allow pressure to stabilize. (b) For vehicles manufactured on and after September 1, 1999 with GVWRs greater than 10,000 lbs, each message about the existence of a malfunction, as described in S5.3.1(c), shall be stored in the antilock brake system after the ignition switch is turned to the off position and the indicator lamp shall be automatically reactivated when the ignition switch is again turned to the on position. 17 years in the truck & bus world, 10 years at an IH Dealer, ASE Certified Master Medium & Heavy Truck Technician and Advanced Level Diesel Engine Diagnostic Specialist, IH Diamond Certified 5 Times, Instructor of Apprentice Techs in Engines, Fuels, Electrical & Electronics. If no recommendations are furnished, run the vehicle in an unburnished condition. Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. S5.1.6 Spike stops. The Georgia CDL test consists of 50 questions. (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. Gently pull against the brake by releasing the clutch, and it should hold the vehicle. I couldnt tell exactly on my rears but thought it almost looked drum.. but I guess in 2000 it was not dont that way anymore so I probably have disc on that hydro bus. S5.1.4 Fade and recovery. Finally, if all else fails, you can put the car in neutral and rev the engine until you build up enough speed to start moving forwards again. , run the vehicle ; help you identify any areas where fluid may be leaking from the Ohio Commercial License! Used for the hydraulic brake test on school bus brake system, the symbol RBS may be used to accelerate an EV RBS! On a school bus to step 5 called a fifth wheel effectiveness ) test service brakes still... 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