Does this happen in the U.S.A. as well? S5.1.1.2 In the second effectiveness test, each vehicle with a GVWR of 10,000 pounds or less and each school bus with a GVWR greater than 10,000 pounds shall be capable of stopping from 30 mph and 60 mph, and each vehicle with a GVWR greater than 10,000 pounds (other than a school bus) shall be capable of stopping from 60 mph, within the corresponding distances specified in Column II of Table II. S-cam brakes, on the other hand, require an external slack adjuster. A course for truck, bus & RV drivers operating a vehicle fitted with air brakes. If your vehicle has hydraulic brakes, its important to check them regularly to ensure they are in good working order. (c) For a vehicle using an electrically-activated parking brake, apply the parking brake by activating the parking brake control. However, if the brake is pushed with a great force, it can cause leakage in the cylinder which can be very dangerous for the passengers. The vehicle is aligned in the center of the roadway at the start of each brake application. Effectively, the engine works backwards by creating negative torque. (c) At vehicle speeds above 20 mph, any wheel not permitted to lock in (a) or (b) may lock up repeatedly, with each lockup occurring for a duration of one second or less. (2) Except for a separate indicator lamp for an anti-lock system, a regenerative system, or an indicator for both anti-lock and regenerative system, the letters and background of each separate indicator lamp shall be of contrasting colors, one of which is red. S7.16.1 Baseline check stop. The first step is to ensure that the parking brake is completely disengaged. S6.13 Control forces. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. Vehicle Hydraulic Brake System Testing. %PDF-1.4 % Tandem axle means a group of two or more axles placed in close arrangement one behind the other with the center lines of adjacent axles not more than 72 inches apart. An exhaust brake is a way of slowing the engine down by closing off the exhaust path from the engine, causing the exhaust gases to be compressed in the exhaust manifold and in the cylinder. S7.4.2 Vehicles with GVWR greater than 10,000 pounds. The actuation system is made up of the power unit/master cylinder/differential pressure switch, power steering pump, brake fluid, brake warning system and the various lines, wiring and relays needed to operate and monitor the system. S7.9.5 For a vehicle 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 tests in S7.9.1 through S7.9.3 of this standard are conducted by inducing any single failure in any circuit that electrically transmits the brake signal, and all other systems intact. S5.1 Service brake systems. b. Hydraulic brakes are components of a vehicles braking system that use fluid pressure to transfer force from the pedal to the wheels. S6.2.5 For tests conducted in neutral, the operator of an EV with no neutral position (or other means such as a clutch for disconnecting the drive train from the propulsion motor(s)) does not apply any electromotive force to the propulsion motor(s). S7.10.2 Optional Procedures. Turn the key to the off position. FAR). Determine the control force, pressure level, or fluid level (as appropriate for the indicator being tested) necessary to activate the brake system indicator lamp. S7.16.2 Wet brake recovery stops. S7.10 Service brake system - inoperative brake power unit or brake power assist unit test. 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. Your email address will not be published. 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. (f) For a vehicle with electric transmission of the service brake control signal, failure of a brake control circuit. John Fay DewinterizeYour RV: A Complete Checklist. %%EOF An auxiliary means may be used to accelerate an EV to test speed. Leave an interval of 0.4 mi between the start of brake applications. (c) For a vehicle which has an auxiliary battery (or batteries) that provides electrical energy to operate the electrically-actuated service brakes, the auxiliary battery(batteries) is (are) at (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. S3. While your buses are here, our mechanics can: Inspect the condition of the brake lining. 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. Facebook Page: Blue Bird Corporation Fans. Visually inspect the brake pad lining by checking each visible end and look through the opening of the caliper. Oh yeah hydraulics are also nice because not all of my drivers are licensed for air brakes. Make three stops from 30 mph at 10 fpsps for each stop. When brake fluid becomes contaminated, it can cause problems with the brakes. Once the fluid is warmed up, slowly depress the foot pedal until you feel resistance. Is it because school bus operators are too cheap to train their drivers? The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. 8 0 obj<>stream S5.1.6 Spike stops. 1 question, Was the hydraulic brakes vacuum boosted or Hydro boosted? Test questions come from the Ohio Commercial Drivers License Manual. Better stopping power. S1. Release the spring brakes. Each passenger car and each multipurpose passenger vehicle, truck, and bus with a GVWR of 10,000 pounds or less must be capable of meeting the requirements of S5.1.1 through S5.1.6 under the conditions prescribed in S6, when tested according to the procedures and in the sequence set forth in S7. Application. The second test is a flow check. 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. Engine idle speed and ignition timing settings are according to the manufacturer's recommendations. Make four stops in the lightly-loaded weight condition specified in S5.1.7. Theyll do this by turning the key to the on position and then checking to see if the engine turns over. (eg: No recharging is allowed after start of test. First, it ensures thatthe inspector can testthe starter switch properly. Third, be mindful of the time limit for pre-trips. To pass, applicants must answer 40 questions correctly. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. S7.7.1.2 Drive the vehicle, loaded to GVWR, onto the specified grade with the longitudinal axis of the vehicle in the direction of the slope of the grade, stop the vehicle and hold it stationary by application of the service brake control, and place the transmission in neutral. (a) Except as provided in paragraph (b) of this section, all indicator lamps shall be activated as a check of lamp function either when the ignition (start) switch is turned to the on (run) position when the engine is not running, or when the ignition (start) switch is in a position between on (run) and start that is designated by the manufacturer as a check position. 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. Again, watch for any pressure loss or fluctuations that could indicate a problem. However, if the weight on any axle of a vehicle at lightly loaded vehicle weight exceeds the axle's proportional share of the gross vehicle weight rating, the load required to reach GVWR is placed so that the weight on that axle remains the same as a lightly loaded vehicle weight. (For vehicles only having to meet the requirements of S5.1.1, S5.1.2, S5.1.3, and S5.1.7 in section S5.1, the applicable test procedures and sequence are S7.1, S7.2, S7.4, S7.5(b), S7.5(a), S7.8, S7.9, S7.10, and S7.18. Get it fixed before driving. Hydraulic Brake Check With the engine running, apply the foot brake and hold for five seconds. (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. Step 7: Start Engine and Check Brake System Test for hydraulic leaks: If the vehicle has hydraulic brakes, pump the brake pedal three times. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. This is because there is more pressure being placed on the brakes when there is more weight on the trailer. Are their school bus drivers that prefer one over the other? 0000001093 00000 n I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! S5.1.2.2 In vehicles not manufactured with a split service brake system, in the event of any one rupture or leakage type of failure in any component of the service brake system the vehicle shall, by operation of the service brake control, be capable of stopping 10 times consecutively from 60 mph within the corresponding distance specified in column IV of table II. 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. S7.7.2 Test procedure for requirements of S5.2.2. Turn the key to the on position without starting the bus. They're standard on our buses in everything except type "A" and we don't run a lot of them. (b) After being driven for 2 minutes at a speed of 5 mph in any combination of forward and reverse directions through a trough having a water depth of 6 inches, each vehicle with a GVWR of more than 10,000 pounds shall be capable of making five recovery stops from 30 mph at 10 fpsps for each stop with a control force application that falls within the following maximum and minimum limits: (1) A maximum for the first four recovery stops of 150 pounds, and for the fifth stop, of 60 pounds more than the average control force for the baseline check (but in no case more than 110 pounds); and. If the hose fittings do not leak go to step 5. OEM-specified brake lining and pads are recommended when replacement is necessary. The third test is a leaks check. S5.1.2.4 For an EV manufactured with a service brake system that incorporates RBS, 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 the RBS, and with all other systems intact. 0000000516 00000 n Class A Air Brake Test Make sure the air pressure is above 100psi - 120psi. Brake power assist unit means a device installed in a hydraulic brake system that reduces the operator effort required to actuate the system, and that if inoperative does not prevent the operator from braking the vehicle by a continued application of muscular force on the service brake control. (a) (For vehicles with brake power assist units.) Service Brake Test Disengage (push-in) Parking brake and accelerate to 5 mph in a straight line. If the vehicle is equipped with a neutral gear that automatically disables the RBS, the test procedures which are designated to be conducted in gear may be conducted in neutral. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes? Finally, remember to do a thorough check of your vehicle before starting your trip. 0000004592 00000 n This will help keep your car from rolling as well, but should only be used as a last resort. Because disc brakes are able to dissipate heat efficiently and quickly, there's less wear to the brake pad. This contact form is only for website help or website suggestions. The caliper attaches to and slides within an anchor plate or bracket. Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. Also, if the air system fails, the default is brakes applied, hydraulic brakes, not so much. 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