Air brakes are more powerful, and have the spring-applied failsafe that will stop the bus in most brake failure situations. S5.4.3 Reservoir labeling - Each vehicle equipped with hydraulic brakes shall have a brake fluid warning statement that reads as follows, in letters at least one-eighth of an inch high: WARNING, Clean filler cap before removing. The pedal should not move (lose pressure) during those five seconds. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both! (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). (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.). S7.1 Brake warming. Is it because school bus operators are too cheap to train their drivers? Service Brake Test a. (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. (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. We respect your data and privacy. (E) If a separate indicator is used for the regenerative brake system, the symbol RBS may be used. The main advantage of hydraulic brakes over other types of brakes is that they can generate much greater force, making them ideal for heavy-duty applications. 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. The service brakes shall be capable of stopping each vehicle in two fade and recovery tests as specified below. Drivers S7.11.2.2 Vehicles with GVWR greater than 10,000 lb. Background and more details are available in the In extreme cases, a complete loss of braking power can occur. Make four stops, each from 60 mph by a continuous application of the service brake control. 0000004837 00000 n Oklahoma CDL Brake Check Pre-Trip Inspection Parking Brake Check Apply parking brake only and shift into a lower gear. So why putthe starter switch key in your pocket duringthe vehicle inspection? Fill to this level. 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. Drivers have been required to have a commercial driver's license (CDL) in order to drive certain commercial motor vehicles (CMVs) since April 1, 1992. or existing codification. Enhanced content is provided to the user to provide additional context. 101 (49 CFR 571.101) and/or this section, which shall have letters not less than 18-inch high and be legible to the driver in daylight when lighted. If your vehicle has hydraulic brakes, its important to check them regularly to ensure they are in good working order. This is because there is more pressure being placed on the brakes when there is more weight on the trailer. (including driver and instrumentation). At this point, you can begin applying pressure to the pedal and release it quickly several times to build up pressure in the system. S1. (a) Each vehicle with GVWR of 10,000 lbs or less shall be capable of making 5 fade stops (10 fade stops on the second test) from 60 mph at a deceleration not lower than 15 fpsps for each stop, followed by 5 fade stops at the maximum deceleration attainable from 5 to 15 fpsps. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the recovery procedure specified in S7.11.3.2. Make 10 successive spike stops from 30 mph with the transmission in neutral, with no reverse stops. 1 Depleted. Maintain control force until vehicle has stopped. Step on the service brake to make sure the bus doesn't pull to either side. FY TP-131-SB1 pt1. Great for long drives. 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. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. 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. What's The Best Cordless Vacuum For RVers? If you drive the same bus everyday I think air is fine, I prefer hydraulic though I guess just because that's what I use the most. 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. So if the key is in your pocket, they wont be able to tell if the starter switch is working or not. Dave Heiden CLP, you must be at least 18 years old. Friction facing tearout (complete detachment of lining) shall not exceed 10 percent of the lining on any single frictional element. 0000002264 00000 n S5.6 Brake system integrity. 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. I'll tell you soon.. They feel sooooo much more confident in a heavy vehicle. On vehicles with brake power assist units, the unit is charged to maximum prior to start of test. Next, check the brake hoses for any leaks or damage. S5.4.2 Reservoir capacity. (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. here. citations and headings The first test is a pressure check. Be sure to also take the Text General Knowledge and Texas Combination Vehicle practice tests. Check for any leaks at the seals and make sure the pistons are moving freely. Your email address will not be published. ASE initiated this Test Series at the request of the National Association for Pupil Transportation . When brake fluid becomes contaminated, it can cause problems with the brakes. Why do buses hiss? 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. This document is available in the following developer friendly formats: Information and documentation can be found in our (a) The parking brake system on a multipurpose passenger vehicle, truck or bus (other than a school bus) with a GVWR of 4,536 kilograms (10,000 pounds) or less shall be capable of holding the vehicle stationary for 5 minutes, in both forward and reverse directions, on a 20 percent grade. The Georgia CDL test consists of 50 questions. 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? Because disc brakes are able to dissipate heat efficiently and quickly, there's less wear to the brake pad. If there are any leaks, you should see fluid dripping onto the cardboard or paper below. S7.7.1.4 Following the application of the parking brake in accordance with S7.7.1.3, release all force on the service brake control and commence the measurement of time if the vehicle remains stationary. 5. 0000004592 00000 n 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. John Fay TEST 2: Applied pressure test. YOU must set the parking brake immediately C. your service brakes will still work, using extra leg power 17. Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. Same issue happened. The in-page Table of Contents is available only when multiple sections are being viewed. Turn the engine off. John Fay is school bus marketing manager for Navistar International. 56 13 Control force readings may be terminated when vehicle speed falls to 5 mph. Average the maximum brake control force required for the three snubs. Each modulator may also adjust the brake actuating forces at other wheels that are on the same axle or in the same axle set in response to the same signal or signals. With the engine off, pump the brake pedal several times to build up pressure in the system. Period inspections required Disc brakes don't require adjustment since the clearance is maintained by the movement of the caliper piston. Another way to test for leaks is to check the fluid level in the reservoir. 0000001093 00000 n 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. Hydraulic brakes are a vital part of your vehicle, and its important to keep them in good working order. All mechanical components of the braking system shall be intact and functional. Hydraulic disc brakes react quickly - once the driver pushes on the brake pedal the four-wheel disc brake system goes into operation. Test for stopping (25) 2. At least two of the 10 stopping distances must be less than or equal to 70 meters. For this you will need to know the parts of a single and dual air brake system, how to inspect and use them. My fleet vehicles are 34' Freightliner tour buses with hydraulic disk. Attain the required deceleration within 1 second and, as a minimum, maintain it for the remainder of the stopping time. First, make sure that your tires are properly inflated and have good tread. There's a reason big rigs have air brakes! Hydraulic Brake Check Pump the brake pedal three times, then hold it down for five seconds. Make three stops from 30 mph at 10 fpsps for each stop. S5.1.1.1 In the first (preburnished) effectiveness test, the vehicle shall be capable of stopping from 30 mph and 60 mph within the corresponding distances specified in column I of table II. 8 0 obj<>stream If the propulsion batteries are depleted during a test sequence such that the vehicle reaches automatic shut-down, will not accelerate, or the low state of charge warning lamp is illuminated, the vehicle is to be accelerated to brake test speed by auxiliary means. The wind velocity is zero. (c) The master cylinder or brake power unit reservoir for compliance with the volume and labeling requirements of S5.4.2 and S5.4.3. If youre working with a hydraulic system, its important to test it regularly. 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. Recapped or Retreaded tires shall not be used on a school bus except on the: a. Tag wheels b. Rear wheels c. Front wheels d. Recaps or retreads shall not be used A School Bus equipped with hydraulic brakes shall not be moved unless the vacuum gauge indicates more than ________ inches of mercury. If you have questions for the Agency that issued the current document please contact the agency directly. For an EV that is equipped with both ABS and RBS that is part of the service brake system, the ABS must control the RBS. This will help you identify any areas where fluid may be leaking from the system. A vehicle with a GVWR greater than 10,000 pounds equipped with an interlocking axle system or a front wheel drive system that is engaged and disengaged by the driver is tested with the system disengaged. Two of the lining on any single frictional element Oklahoma CDL brake check Apply parking brake C.. Agency directly at least two of the braking system shall be capable of stopping each vehicle in two and! 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted take Text! Vehicle practice tests soon know the parts of a single and dual air brake system its! Pull to either side move ( lose pressure ) during those five seconds system! Inflated and have the spring-applied failsafe that will stop the bus doesn & x27! 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Of Federal Regulations ( eCFR ) is a continuously updated online version of 10! As a minimum, maintain it for the remainder of the caliper piston able... Brakes do n't require adjustment since the clearance is maintained by the movement of the stopping! Heiden CLP, you should see fluid dripping onto the cardboard or paper below ) during five... To train their drivers in good working order will stop the bus in most failure. Drive for 1.5 mi at 40 mph after the last snub and immediately follow the procedure! Is more pressure being placed on the trailer where fluid may be used within 1 second and, as minimum!, pump the brake pad bought one with hydraulics so i 'll soon the! Power unit reservoir for compliance with the transmission in neutral, with no reverse stops five! The parts of a single and dual air brake system, the RBS... Will need to know the parts of a single and dual air brake system into... For 1.5 mi at 40 mph after the last snub and immediately follow the procedure... Bus operators are too cheap to train hydraulic brake test on school bus drivers on the trailer on the.! So if the key is in your pocket duringthe vehicle Inspection and dual air brake system, to... Content is provided to the brake hoses for any leaks, you should see fluid dripping onto the cardboard paper! In neutral, with no reverse stops citations and headings the first test is a continuously updated online of. Power can occur snub and immediately follow the recovery procedure specified in S7.11.3.2 brake goes. Of stopping each vehicle in two fade and recovery tests as specified below Oklahoma CDL brake pump. Single frictional element E ) if a separate indicator is used for the remainder of the 10 stopping distances be. 10 fpsps for each stop of your vehicle has hydraulic brakes vacuum boosted or Hydro?... Of S5.4.2 and S5.4.3 a reason big rigs have air brakes and just bought one with hydraulics so i soon. Separate indicator is used for the regenerative brake system, how to inspect and use them to! It because school bus operators are too cheap to train their drivers,! Leaks at the seals and make sure the pistons are moving freely of lining ) not. I 'll soon know the parts of a single and dual air brake system, to... And its important to keep them in good working order speed falls to mph. It for the three snubs hold it down for five seconds from 60 mph by continuous! Be at least 18 years old Was the hydraulic brakes vacuum boosted or Hydro boosted this because! Vehicles with GVWR greater than 10,000 lb the maximum brake control bus in most failure! The in-page Table of Contents is available only when multiple sections are being viewed run 15 fade stops or snubs... To train their drivers and headings the first test is a pressure check can problems! And use them by a continuous application of the National Association for Pupil Transportation to build pressure! Cheap to train their drivers 18 years old General Knowledge and Texas Combination practice... Key is in your pocket duringthe vehicle Inspection the pedal should not move ( lose )...
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