Repeat the test, impacting the vehicle from the rear. The batteries may be charged at a more frequent interval if, during a particular 40-stop increment, the EV is incapable of achieving the initial burnish test speed. S7.16 Service brake system - water recovery test. (b) The friction surface of the brake, the master cylinder or brake power unit reservoir cover and seal and filler openings, for leakage of brake fluid or lubricant. (b) Each vehicle with a GVWR of more than 10,000 pounds shall be capable of making five recovery snubs from 40 mph to 20 mph at 10 fpsps for each snub, with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery snubs of 150 pounds, and for the fifth snub, of 20 pounds more than the average control force for the baseline check (but in no case more than 100 pounds); and. (b) For EVs with RBS that is part of the service brake system, the tests in S7.10.1 or S7.10.2 are conducted with the RBS discontinued and all other systems intact. 3) Here are the types of tests that must be conducted on a typical air brake system: a) The Governor Cut in/Cut out test is to make sure that the governor is applying or cutting off air pressure to the air reservoir tanks as needed. Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. Where manufacturer options are specified, the manufacturer shall select the option by the time it certifies the vehicle and may not thereafter select a different option for the vehicle. 571.105 Standard No. Heres how to test your hydraulic brakes for leaks: 1. attacks or slurs, hate speech, demonstrably false information, excessive profanity, or that are thinly veiled promotions for a product, will not be approved. The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. Ask Your Own Medium and Heavy Trucks Question With a moving barrier as described in paragraph 4.3 of SAE Recommended Practice J972 (2000) (incorporated by reference, see 571.5), impact the vehicle from the front at 212 mph. Brake pads are mounted on each side of the rotor and grip the rotor when hydraulic pressure is applied by the hydraulic piston located in the caliper. Bookmark +. The parking brake tests for any vehicle on different grades, in different directions, and for different loads may be conducted in any order. TEST 3: Service brake warning system test. Wheel lockup means 100 percent wheel slip. You can Each vehicle with electrically-actuated service brakes (brake power unit) shall comply with the requirements of S5.1.3.1 with any single electrical failure in the electrically-actuated service brakes and all other systems intact. Does this happen in the U.S.A. as well? Tire inflation pressure is the pressure recommended by the vehicle manufacturer for the GVWR of the vehicle. Accelerate immediately to the initial test speed after each stop. multiple choice questions that will test your understanding of terminology. A. S6.10.1 For vehicles with a GVWR of 10,000 pounds or less, stops are made with wheel lockup permitted only as follows: (a) At vehicle speeds above 10 mph, there may be controlled wheel lockup on an antilock-equipped axle, and lockup of not more than one wheel per vehicle, uncontrolled by an antilock system. Next, check the brake hoses for any leaks or damage. This content is from the eCFR and is authoritative but unofficial. 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. 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. force and hold while checking hydro-boost hose fittings for leaks. 5. Stability and control during braking (braking-in-a-curve test), 8. They feel sooooo much more confident in a heavy vehicle. All buses using hydraulic brake systems must be equipped with emergency brakes and parking brakes. bluebirdvision
Disc brake systems use a two-piston sliding caliper at the steer axle and drive axle; older buses may utilize a single-piston caliper. I Vote Air Brakes, I agree about that they lock up, and you can't move, instead of that I can't stop. The rotors on both front and rear brake groups are protected on the inboard side by splash shields bolted to the wheel end anchor plates. All Rights Reserved. Otherwise, you could find yourself in a dangerous situation while driving. (c) Test as in S7.7.1 except on a 20 percent grade, with the parking mechanism not engaged. Organization and Purpose Service Brake Test Disengage (push-in) Parking brake and accelerate to 5 mph in a straight line. (b) (For vehicles with brake power units with accumulator type systems.) %PDF-1.4
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S7.11 Service brake system - first fade and recovery test. We dont stop at every drive way or each 10th mile either. Repeat S7.4, except make 35 burnish stops or snubs. (This test is not applicable to a vehicle which has a GVWR of not less than 7,716 pounds and not greater than 10,000 pounds and is not a school bus.). 8 0 obj<>stream
They last longer and are much more cost effective. a. Fluid pressure b. With transmission in neutral (or declutched) make 10 snubs from 40 to 20 mph at 10 fpsps for each snub. Step on the service brake to make sure the bus doesn't pull to either side. S6.2.2 At the beginning of the first effectiveness test specified in S7.3, and at the beginning of each burnishing procedure, each EV's propulsion battery is at the maximum state of charge recommended by the manufacturer, as stated in the vehicle operator's manual or on a label that is permanently attached to the vehicle, or, if the manufacturer has made no recommendation, at a state of charge of not less than 95 percent. 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. Get it fixed before driving. Enhanced content is provided to the user to provide additional context. Third, be mindful of the time limit for pre-trips. No further charging of any propulsion battery occurs during any of the performance tests in the test sequence of this standard. Turn the key to the off position. S1. exact, verbatim wording for each component that must be checked;. (b) For an EV equipped with an RBS that is not part of the service brake system, the RBS is operational and set to produce the maximum regenerative braking effect during the burnishes, and is disabled during the test procedures. i stand corrected on my hydro brakes in the new bus.. im told all bluebird internationals are 4 wheel disc.. %PDF-1.4
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1 Depleted. For vehicles equipped with more than one brakepower assist or brakepower unit, conduct tests of each in turn. "Published Edition". Can I Bring My Own Oil And Filter to Valvoline, How Do I Reset My Central Locking On My Car, How Do I Get Dried Paint Off My Car Interior, Park your vehicle on a level surface and set the emergency brake, Place a large pan or catch basin underneath the hydraulic brake line where it connects to the wheel cylinder or caliper, Have an assistant slowly depress the brake pedal while you watch for any dripping fluid from the connection point, If there is no sign of leaking, have your assistant pump the brakes several times before holding down firmly on the pedal to check for leaks again, Repeat steps 3 and 4 at each connection point until you are satisfied that there are no leaks in the system. S5.3.4 When an indicator lamp is activated it may be steady burning or flashing. With transmission in neutral (or declutched) make five snubs from 40 to 20 mph at 10 fpsps for each snub. 0000000778 00000 n
Conversely, if the pressure is too high, it can cause the brakes to lock up. is available with paragraph structure matching the official CFR Vehicles are burnished according to the following procedures. You should also bleed your brakes regularly to get rid of any air bubbles that may have gotten into the system. We respect your data and privacy. Period inspections required Disc brakes don't require adjustment since the clearance is maintained by the movement of the caliper piston. Is it true that air brakes cost less to maintain? c. Test the bus a second time to make sure the bus stops properly. For vehicles with a GVWR of 10,000 pounds or less, or any school bus, make six stops from 30 mph. %%EOF
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. Hydraulic brakes are used on passenger vehicles and use brake fluid to operate the brakes. 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). Skid number means the frictional resistance of a pavement measured in accordance with ASTM E274-70 (incorporated by reference, see 571.5) at 40 mph, omitting water delivery as specified in paragraphs 7.1 and 7.2 of that method. The official, published CFR, is updated annually and available below under All Buses Must-Have Emergency Brakes. they are hydro boost with a backup electric motor that operates the assist in case of engine failure. When checking for hydraulic leaks in the brake system you should pump the foot pedal ____ times then hold it down A. Hydraulic Brakes have hydraulic hoses, tubing, valves, and con- Includes the hydraulic nections leaking, cracked, portion of vacuum actuated pinched, chafed, flat- and compressed-air-over tened, restricted, broken, Engineer: Manuel Maldonado. As a Mechanic of a small fleet I prefer the hydraulic because they are simpiler and cheaper to work on and I dont have to worry about brakes being out of adjustment. Air Brakes - They just plain Sound Bad-Ass!! The tractor protection valve For vehicles with parking brake systems not utilizing the service brake friction elements, burnish the friction elements of such systems prior to parking brake tests according to the manufacturer's published recommendations as furnished to the purchaser. S7. When brake fluid becomes contaminated, it can cause problems with the brakes. Linings are assumed adjusted for normal operating clearance in the released position. There's a reason big rigs have air brakes! Release the spring brakes. S7.7.1.3 With the vehicle held stationary by means of the service brake control, apply the parking brake by a single application of the force specified in (a), (b), or (c) of this paragraph, except that a series of applications to achieve the specified force may be made in the case of a parking brake system design that does not allow the application of the specified force in a single application: (a) In the case of a passenger car or other vehicle with a GVWR of 10,000 lbs. citations and headings The performance requirements of S5 shall be met under the following conditions. S5.1.1.4 In the fourth effectiveness test, a vehicle with a GVWR of 10,000 pounds or less shall be capable of stopping from 30 and 60 mph within the corresponding distances specified in column I of table II. Taking the bus to school involves walking to the bus stop. Hydraulic brakes work by using fluid pressure to go against the brake pads. (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). (c) The service brakes shall be capable of stopping each vehicle with a GVWR greater than 10,000 pounds in two effectiveness tests within the distances and from the speeds specified in S5.1.1.2 and S5.1.1.3. Engineer: Frederick Smith. (a) Each indicator lamp shall display word, words or abbreviation, in accordance with the requirements of Standard No. S5.5 Antilock and variable proportioning brake systems. and 100 F. FAR). During each burnish procedure, each propulsion battery is restored to the recommended state of charge or a state of charge of not less than 95 percent after each increment of 40 burnish stops until each burnish procedure is complete. 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