Class A Air Brake Test Make sure the air pressure is above 100psi - 120psi. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes? https://www.facebook.com/home.php?sk=group_212311114614&ap=1. will bring you directly to the content. B. 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. Engine idle speed and ignition timing settings are according to the manufacturer's recommendations. 101 and/or this section and symbols may be provided for purposes of clarity. S7.10.2 Optional Procedures. 1/1.1 1. The wind velocity is zero. 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. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. 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. A. (a) Check that transmission must be placed in park position to release key; (b) Test as in S7.7.1, except in addition place the transmission control to engage the parking mechanism; and. FY TP-131-SB1 pt1. Air pressure will drop, allow pressure to stabilize. 6 0 obj<> endobj (3) Before or upon application of 25 pounds of control force upon a service brake with a brake power assist unit. 0000004589 00000 n To receive this license, applicants must pass a 50-question test. With transmission in neutral (or declutched), make three snubs from 40 to 20 mph at 10 fpsps for each snub. If a vehicle is incapable of attaining a speed specified in S5.1.4 in the time or distance interval set forth, it must be tested at the highest speed attainable in the time or distance interval specified. Learn more about the eCFR, its status, and the editorial process. Next, firmly apply pressure to the pedal and hold it down for 30 seconds. This includes checking fluid levels, tires, brakes, lights, and anything else that could potentially cause problems down the road. Reflectors -clean, not missing or broken . Accelerate immediately to the initial test speed after each snub. There's nothing more important on any school bus than the braking system. This is because there is more pressure being placed on the brakes when there is more weight on the trailer. If air bubbles get into the hydraulic fluid, they can compress when the brake pedal is applied. Brake power units shall also be charged to maximum accumulator pressure prior to start of test. Scope. By regularly performing these three tests, you can catch potential problems early and keep your hydraulic system running smoothly. 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. Disconnect the primary source of power. Disc brakes are long lasting and provide safe, even stopping. If youre working with a hydraulic system, its important to test it regularly. Control force readings may be terminated when vehicle speed falls to 5 mph. b. CDL School Bus Endorsement S Practice Test -3. %PDF-1.4 % 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. 0000000016 00000 n Oh yeah hydraulics are also nice because not all of my drivers are licensed for air brakes. 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. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. Facebook Page: Blue Bird Corporation Fans. 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. The eCFR is displayed with paragraphs split and indented to follow Next, check the brake hoses for any leaks or damage. Does this happen in the U.S.A. as well? Vehicles are burnished according to the following procedures. If equipped with a hydraulic brake reserve system, with the key in the off position, depress the brake pedal and listen for the sound of the reserve system electric motor turning on. xref Maximum drive-through speed means the highest possible constant speed at which the vehicle can be driven through 200 feet of a 500-foot radius curve arc without leaving the 12-foot lane. 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. The GA CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%).The CDL general knowledge test is required to be taken by all CDL applicants. ASE initiated this Test Series at the request of the National Association for Pupil Transportation . Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system. (c) For a vehicle using an electrically-activated parking brake, apply the parking brake by activating the parking brake control. Regulation Y Air brakes are the most common type of brake used on school buses. 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. (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. You can learn more about the process full text search results Otherwise, you could find yourself in a dangerous situation while driving. If the vehicle is equipped with an adjustable engine speed governor, it is adjusted according to the manufacturer's recommendation. Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari. Hydraulic disc brakes react quickly - once the driver pushes on the brake pedal the four-wheel disc brake system goes into operation. Leave an interval of 30 s between snubs (start of brake application to start of brake application). 7, Hydraulic Brake Reservoir 2. Restore the system to normal at completion of this test. The second feature is a unique cam design that applies the brake shoe. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. The service brakes shall be capable of stopping each vehicle in two fade and recovery tests as specified below. Inoperative brake power and power assist units. S7.7.3 Lightly loaded vehicle. (including driver and instrumentation); (b) For vehicles with a GVWR greater than 10,000 lbs., unloaded vehicle weight plus 500 lbs. Since most large trucks have air brakes then why not large school buses. 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. 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. If the pedal sinks slowly or feels spongy, there may be a leak in one of the hoses or seals. 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. Determine whether the brake system indicator lamp is activated when the electrical power source to the antilock or variable proportioning unit is disconnected. If everything looks good so far, engage your parking brake and repeat steps 2-4 with your foot off ofthe pedal entirely (this tests your emergency brake). They're standard on our buses in everything except type "A" and we don't run a lot of them. The Federal Motor Carrier Safety Administration (FMCSA) has developed and issued standards for State testing and licensing of CDL holders. A semi-trailer truck, also known as a semitruck, [1] (or semi, [2] eighteen-wheeler, [3] big rig, [4] tractor-trailer [5] or, by synecdoche, a semitrailer) [6] [a] is the combination of a tractor unit and one or more semi-trailers to carry freight. Press both air brake valves in, red valve first then yellow in second. 0000002585 00000 n Right Side of School Bus . Stop the vehicle with the vehicle at its lightly loaded vehicle weight, or at the manufacturer's option, at its lightly loaded vehicle weight plus not more than an additional 1000 pounds for a roll bar structure on the vehicle. Each vehicle shall be capable of completing all performance requirements of S5 without -. This content is from the eCFR and may include recent changes applied to the CFR. S6.3 Tire inflation pressure. AIR BRAKES PRACTICE TEST- A 1. Fastback Top Member 1500 Posts Posted - 04/03/2010 : 04:59:49 AM Check the fluid level in the hydraulic brake reservoir. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. For vehicles with a GVWR of 10,000 pounds or less, or any school bus, make six stops from 30 mph. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? If the brake power or brake power assist unit operates in conjunction with a backup system and the backup system is activated automatically in the event of a primary power failure, the backup system is operative during this test. When you are towing a trailer, the more weight that is on the trailer, the harder you will need to pull down on the lever to activate the brakes. RBS failure may also be indicated by a lamp displaying the symbol ABS/RBS.. and 100 F. 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. 0000000778 00000 n With the traction battery pack fully charged, it is capable of approximately an 70 mile range at a constant 45 mile per hour velocity. 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