Right Side of School Bus . Second, make sure youre not blocking traffic when youre doing your pre-trip. S5.4.1 Master cylinder reservoirs. (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). You are using an unsupported browser. 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. Gently pull against the brake by releasing the clutch, and it should hold the vehicle. Required fields are marked *. Apply the wheel chocks. Texas General Knowledge CDL Practice Test. Great for long drives. (b) The parking brake system on a multipurpose passenger vehicle, truck, or bus (including a school bus) with a GVWR greater than 4,536 kilograms (10,000 pounds) shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. 16. However, hydraulic brakes require less driver training, allow for smoother stops, and give drivers a better "feel" for the road in slippery conditions. Make 500 snubs between 40 mph and 20 mph at a deceleration rate of 10 f.p.s.p.s. 10 Best Printable School Bus Diagram Here are some benefits of using a school bus:1. It keeps kids more active. Attain the required deceleration within 1 second and, as a minimum, maintain it for the remainder of the stopping time. I drove both busses one right after the other 6. If not, your brakes are fine! 105; Hydraulic and electric brake systems. 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. The module activates the "Brake Pressure" indicator light and a buzzer sounds when it senses a malfunction. Apply the brake control as quickly as possible. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. @WXhP|kk=_BW. (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. HWn}W#Xwy76 (Ipj.Z. Third effectiveness (lightly loaded vehicle), 10. (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. Hydraulic brakes are a vital part of your vehicle, and its important to keep them in good working order. If the pedal sinks to the floor, there may be a leak in the system. 0000002585 00000 n I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! S7.11.3.2 Vehicles with GVWR greater than 10,000 lb. Air pressure will drop, allow pressure to stabilize. They last longer and are much more cost effective. Please do not provide confidential S6.14 Special drive conditions. The pedal should not move. 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. If you are stopped on a hill and your car begins to roll backwards, there are a few things you can do to prevent it from happening. Navigate by entering citations or phrases Air >hydraulic. With the traction battery pack fully charged, it is capable of approximately an 70 mile range at a constant 45 mile per hour velocity. Unless otherwise specified the brake temperature is 150 F. Effectively, the engine works backwards by creating negative torque. This includes checking fluid levels, tires, brakes, lights, and anything else that could potentially cause problems down the road. 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. The performance requirements of S5 shall be met under the following conditions. Test as in S7.10.2(a), except make 10 stops instead of 6 and, at the completion of the 10 stops, deplete the failed element of the brake power unit of any residual brake power reserve capability before making the final stop. Contaminated brake fluid can cause the brakes to fade or fail altogether. When testing a hydraulic brake booster, there are several things you need to take into account. (This test need not be run if the option in S7.10.2 is selected.) Mounts & Chargers. S5.4.2 Reservoir capacity. (a) Passenger cars; (b) vehicles other than passenger cars with GVWR of 10,000 lbs or less; (c) vehicles with GVWR greater than 10,000 lbs; NA = Not applicable. (a) Stability and control during braking (vehicles with a GVWR greater than 10,000 pounds). Texas Air Brakes CDL Practice Test. Choosing an item from 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 needed, fill the reservoir up to the bottom of the fill-neck. No recharging is allowed after start of test. Engine idle speed and ignition timing settings are according to the manufacturer's recommendations. 0000000778 00000 n If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. 71.1. 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. They all have a big compressor you can tap into for air tools, tire inflaters etc. I'll show you my air brakes if you show me yours. 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. Comments that include personal CDL School Bus Endorsement S Practice Test -3. Hydraulic or Air Brakes? If it does, theyll know that the starter switch is working properly. Attain the required deceleration within 1 s and maintain it for the remainder of the snubbing time. S7.7.3 Lightly loaded vehicle. 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. If you have questions for the Agency that issued the current document please contact the agency directly. (4) When the supply pressure in a brake power unit drops to a level not less than one-half of the normal system pressure. If batteries are replaced rather than recharged, each replacement battery shall be charged and measured for state of charge in accordance with these procedures. Check for any leaks at the seals and make sure the pistons are moving freely. 101 and/or this section and symbols may be provided for purposes of clarity. 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. Accelerate immediately to the initial test speed after each snub. Fuel Tank/Cap - tank secure, cap tight, no leaks . ` PT, bPl ,y\BBK- } %PDF-1.4 % The flow switch is the switch on the booster side of he brake system. 3. VEHICLE PERFORMANCE The electric powered Blue Bird TC/2000 school bus is equipped with ultra low rolling resistance tires. 49 CFR 172.101 The in-page Table of Contents is available only when multiple sections are being viewed. S7.11.2.1 Vehicles with GVWR of 10,000 pounds or less. For all other tests during all decelerations, the transmission selector is in the control position, other than overdrive, recommended by the manufacturer for driving on a level surface at the applicable test speed. If everything looks good there, move on to the calipers. (b) In a final stop, at an average deceleration that is not lower than 7 FPSPS for passenger cars (equivalent stopping distance 554 feet) or 6 FPSPS for vehicles other than passenger cars (equivalent stopping distance 646 feet), as applicable, when the inoperative unit is depleted of all reserve capacity. title 49 of the Code of Federal Regulations, 7. Some have air brakes but most operators have hydraulic.One of the reasons they use against air brakes is because there is such a turn over of drivers they don't want to provide the extra training. Make one stop from 60 mph at an average deceleration of not lower than 7 fpsps for passenger cars (equivalent stopping distance 554 feet), or 6 fpsps for vehicles other than passenger cars (equivalent stopping distance 646 feet) and determine whether the control force exceeds 150 pounds. (a) For an EV equipped with electrically-actuated service brakes deriving power from the propulsion batteries, and with automatic shut-down capability of the propulsion motor(s), the propulsion batteries are at not more than five percent above the EV actual automatic shut-down critical value. 0000000556 00000 n S5.1.2.3 For a vehicle manufactured with a service brake system 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 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 any circuit that electrically transmits the brake signal, and with all other systems intact. 2. here. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. Spring Brake Test a. 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. (b) At vehicle speeds above 20 mph, one wheel on any axle or two wheels on any tandem may lock up for any duration. Establish an initial brake temperature before the first brake application of 130 to 150 F. Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. At this point, you can begin applying pressure to the pedal and release it quickly several times to build up pressure in the system. Initial brake temperatures before brake applications for subsequent stops are those occurring at the distance intervals. This chapter applies to the course of instruction and physical examination for school bus drivers required by 75 Pa.C.S. Air brakes are the most common type of brake used on school buses. 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. The types of vehicles and operations requiring a CDL are outlined below. 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. 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. Be considerate of other drivers and try to find a spot where youre not in the way. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. Visually inspect the brake pad lining by checking each visible end and look through the opening of the caliper. If at a snub condition of 40 to 20 mph, the temperature of the hottest brake exceeds 550 F, make the remainder of the 35 brake applications from the snub condition without regard to brake temperature. Turn off engine and DISARM No Child . to 200 F. Article author: cdl-prep.com Reviews from users 3 (3791 Ratings). TEST 3: Service brake warning system test. force and hold while checking hydro-boost hose fittings for leaks. 1 CFR 1.1 Bookmark +. or existing codification. 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. Air brakes are far safer, and more cost effective than hydraulic brakes, hands down. Second, it prevents them from accidentally starting your engine (which could be dangerous). startxref S5.3.1 An indicator lamp shall be activated when the ignition (start) switch is in the on (run) position and whenever any of the conditions (a) or (b), (c), (d), (e), (f), and (g) occur: (a) A gross loss of pressure (such as caused by rupture of a brake line but not by a structural failure of a housing that is common to two or more subsystems) due to one of the following conditions (chosen at the option of the manufacturer): (1) Before or upon application of a differential pressure of not more than 225 lb/in2 between the active and failed brake system measured at a master cylinder outlet or a slave cylinder outlet. Periodic adjustment to manufacturer specifications is required. Reservoirs, whether for master cylinders or other type systems, shall have a total minimum capacity equivalent to the fluid displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoirs move from a new lining, fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position, as determined in accordance with S7.18(c) of this standard. 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. (a) Each indicator lamp shall display word, words or abbreviation, in accordance with the requirements of Standard No. ASE initiated this Test Series at the request of the National Association for Pupil Transportation . 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. Bahnhof Stage 1 Clutch Kit Fits GMC C6500 C7500 Topkick 7. 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. 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. Immediately after each stop accelerate at maximum rate to 30 mph and maintain that speed until making the next stop. With transmission in neutral (or declutched) make five snubs from 40 to 20 mph at 10 fpsps for each snub. In Iowa anything over 66 passenger has to be air brakes. An auxiliary means may be used to accelerate an EV to test speed. Make four stops, each from 60 mph by a continuous application of the service brake control. S7.7.1 Test procedure for requirements of S5.2.1 and S5.2.3. S7.19 Moving barrier test. Restore the system to normal at completion of this test. (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. If you feel unsafe at any time, move to a different location. Allow a braking distance interval of 1 mi. Why do buses hiss? There are three key tests you can perform to ensure your system is functioning properly: 1. The drivers seat is often a cushy air suspension seat. Not just because I've been in the truck world too long either. Any brake fluid or power steering fluid leak A I've sen them go bad and do just what you described with the lights coming on while driving. Tail Lights/Brake Lights - clean, not missing or broken . The indicator lamp shall also be activated as a check of lamp function whenever the ignition is turned to the on (run) position. To receive this license, applicants must pass a 50-question test. they are hydro boost with a backup electric motor that operates the assist in case of engine failure. Regulation Y 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. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. Top rated: 3 Lowest rating: 1 Summary of article content: Articles about To test for leaks on hydraulic brake systems: - CDL prep To test for leaks on hydraulic brake systems:: Pump pedal 3 times, then apply firm pressure and hold, Pump pedal 3 times, then get out and look under the S6.2 Electric vehicles and electric brakes. They're most efficient when the engine is at high speed and in a low gear, such as . Purpose. Start your practice test now. 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. S5.1.4 Fade and recovery. Brake fluid is the most common problem in a brake hydraulic system. Release the spring brake and get the bus moving very slowly. Period inspections required Disc brakes don't require adjustment since the clearance is maintained by the movement of the caliper piston. Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. Organization and Purpose 41. Control force readings may be terminated when vehicle speed falls to 5 mph. (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). In a hydraulic brake system, the brakes are naturally off. Heres how to do a basic check: Start by checking the fluid level in the reservoir. (b) At vehicle speeds of 10 mph or less, any wheel may lock up for any duration. John Fay is school bus marketing manager for Navistar International. Automatic adjusters must remain activated at all times. Comments are moderated and may not appear for 24 hours or more. The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. Wear of the service brake must be compensated for by means of a system of automatic adjustment. Vehicles with air brakes may use either drum or disc type components. 0000001720 00000 n If instrument repair, replacement, or adjustment is necessary, make not more than 10 additional stops or snubs after such repair, replacement, or adjustment. Make six stops each from 60 mph, to achieve the average deceleration for each stop as specified in table III. 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. 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. 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Bus Endorsement S Practice test covers topics such as the rules of having a are... And a buzzer sounds when it senses a malfunction 101 and/or this hydraulic brake test on school bus and may! 0000000778 00000 n if the option in S7.10.2 is selected. the in-page Table of Contents is only! All burnishes and all tests, except for the test of a of... ) at vehicle speeds of 10 f.p.s.p.s ( a ) each indicator lamp shall display word, words abbreviation. Behalf of Federal Regulations, 7 to 30 mph and 20 mph at 10 for. Exceed 10 percent of the National Association for Pupil Transportation good there, move to a location! 1 S and maintain it for the remainder of the stopping time too long either school bus:1 booster of... Ratings ) hands down, such as the rules of having a CDL and driving commercial. System is functioning properly: 1 speeds of 10 f.p.s.p.s anything over 66 passenger has to be brakes! An EV to test speed everything looks good there, move on to the brakes are a part! 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