When stopped four consecutive times under the conditions specified in S6, each vehicle with a GVWR greater than 10,000 pounds manufactured on or after July 1, 2005 and each vehicle with a GVWR greater than 10,000 pounds manufactured in two or more stages on or after July 1, 2006 shall stop from 30 mph or 75 percent of the maximum drive-through speed, whichever is less, at least three times within the 12-foot lane, without any part of the vehicle leaving the roadway. Linings are assumed adjusted for normal operating clearance in the released position. Accelerate immediately to the initial test speed after each snub. Maintain control force until vehicle has stopped. They usually always have air ride suspension on the rear that auto levels to what is needed. (3) Before or upon application of 25 pounds of control force upon a service brake with a brake power assist unit. (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. The first test is a pressure check. (a) Each indicator lamp activated due to a condition specified in S5.3.1 shall remain activated as long as the malfunction exists, whenever the ignition (start) switch is in the on (run) position, whether or not the engine is running. For vehicles equipped with more than one brakepower assist or brakepower unit, conduct tests of each in turn. Except as provided in 5.2.2, the parking brake system on a passenger car and on a school bus with a GVWR of 10,000 pounds or less shall be capable of holding the vehicle stationary (to the limit of traction on the braked wheels) for 5 minutes in both a forward and reverse direction on a 30 percent grade. Went there for test drive with another tech and connected laptop. (3) the limit recommended by the manufacturer, whichever is larger relative to the total possible shoe or pad movement. S7.10.2 Optional Procedures. Conduct 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, whichever is less. View the most recent official publication: These links go to the official, published CFR, which is updated annually. Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. On vehicles with brake power assist units, the unit is charged to maximum prior to start of test. 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. The choice of this option must not be construed as adding to the requirements specified in S5.1.2 and S5.1.3.) (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. 0000000954 00000 n Restore the system to normal at completion of this test. Taking the bus to school involves walking to the bus stop. 36 FR 22902, Dec. 2, 1971, unless otherwise noted. To prevent this from happening, its important to check your brake fluid level regularly and top it up if necessary. Open caps and check fluid level. (a) The service brakes shall be capable of stopping each vehicle with a GVWR of less than 8,000 pounds, and each school bus with a GVWR between 8,000 pounds and 10,000 pounds in four effectiveness tests within the distances and from the speeds specified in S5.1.1.1, S5.1.1.2, S5.1.1.3, and S5.1.1.4. Is one system more safe than the other and/or is one system cheaper than the other? S6.12 Initial brake temperature. Service Brake Test a. (E) If a separate indicator is used for the regenerative brake system, the symbol RBS may be used. S7.4.2.1 Burnish. Turn the key to the on position, do not start the truck. 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. With transmission in neutral (or declutched) make five snubs from 40 to 20 mph at 10 fpsps for each snub. A second thermocouple may be installed at the beginning of the test sequence if the lining wear is expected to reach a point causing the first thermocouple to contact the metal rubbing surface of a drum or rotor. Spring Brake Test a. 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). b. S6.2.3 At the beginning of each performance test in the test sequence (S7,3, S7.5, S7.7 through S7.11, and S7.13 through S7.19 of this standard), unless otherwise specified, each propulsion battery of an EV 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. b. Start with the basics The simple hydraulic disc brake system consists of a pedal and linkage to activate the power booster, which in turn activates the master cylinder; disc brake components include caliper, anchor place, shoe and lining and hub and rotor. Beats leaf springs all to hell. With the brakes fully released at all times, drive the vehicle for 2 min at a speed of 5 mph in any combination of forward and reverse directions, through a trough having a water depth of 6 in. multiple choice questions that will test your understanding of terminology. (g) For an EV with RBS that is part of the service brake system, failure of the RBS. At completion of 10 spike stops, make six effectiveness stops from 60 mph. 17.00 Safety Equipment School bus that fails to meet April 1, 1977 federal school bus safety standards (no approved SED hardship waiver) A 10.02 Registration N/A 4. Control force readings may be terminated when vehicle speed falls to 5 mph. This license is required for driving any legal combination of vehicles, with a gross combination weight rating of 26,001 pounds or more, provided the GVWR of a trailer exceeds 10,000 pounds. Choosing an item from 2. 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. 105; Hydraulic and electric brake systems. Make three stops from 30 mph at 10 fpsps for each stop. 1509 (relating to qualifications . Turn the key to the on position without starting the bus. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? (b) The indicator lamps need not be activated when a starter interlock is in operation. (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). S6.10 Vehicle position and wheel lockup restrictions. Test questions come from the Ohio Commercial Drivers License Manual. If both tests are successful with no issues found, your hydraulic brakes are functioning properly! Oh yeah hydraulics are also nice because not all of my drivers are licensed for air brakes. Bus should stop in straight line without pulling to one side or the other. <<2aa158b17c19dd4986e8916ee1bbfc56>]>> Repeat S7.7.1 or S7.7.2 as applicable except with the vehicle at lightly loaded vehicles weight or at 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. 56 13 Pre-trips should only take a few minutes, so make sure youre efficient. Our questions focus on all the important topics school bus drivers need to know, such as: loading and unloading children, safe driving, handling emergencies and more. (eg: I always worked on juice (hydraulic) 4 wheel disk brakes for the most part. HWn}W#Xwy76 (Ipj.Z. 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) Permanently affixed, engraved, or embossed; (b) Located so as to be visible by direct view, either on or within 4 inches of the brake fluid reservoir filler plug or cap; and. 3. Texas Air Brakes CDL Practice Test. In a hydraulic brake system, the brakes are naturally off. S7.7.4 Non-service brake type parking brake systems. I know we've had some problems in northern wisconsin with the snow icing up in the rear drums, but on the other hand with all the buses now being automatic, you have to set the parking brake overnight with hydraulic and the parking brakes have locked up. What's The Best Cordless Vacuum For RVers? S7.4.2.2 Brake adjustment - post burnish. Drive 1 mi at 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S7.11.3.1. Same issue happened. By clicking the submit button below, you are agreeing with Bobit Business Medias Privacy Policy and this outlined level of consent. 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. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. 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. 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. (a) Detachment or fracture of any component of the braking system, such as brake springs and brake shoe or disc pad facing, other than minor cracks that do not impair attachment of the friction facing. 0000000016 00000 n Inoperative brake power and power assist units. At least two of the 10 stopping distances must be less than or equal to 70 meters. 16. 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. S6.6 Vehicle openings. are closed except as required for instrumentation purposes. Foot or service brakes distance shall, at all times, be . This is because there is more pressure being placed on the brakes when there is more weight on the trailer. It keeps kids more active. Please do not provide confidential The actuation system causes displacement of fluid at a volume and pressure required to cause the foundation brake to apply. 0000002025 00000 n Where a range of conditions is specified, the vehicle shall be capable of meeting the requirements at all points within the range. If lining thickness at the thinnest point appears to be 3/16 inch (4.76 mm) or less, the pad must be replaced. 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. 0000001093 00000 n Establish an initial brake temperature before the first brake application of 130 to 150 F. The official, published CFR, is updated annually and available below under If youre doing a pre-trip on the side of the street, there are a few things you should keep in mind. S5.2.2.1 The vehicle's parking brake and parking mechanism, when both are engaged, shall be capable of holding the vehicle stationary (to the limit of traction of the braked wheels) for 5 minutes, in both forward and reverse directions, on a 30 percent grade. For centergrooved shoes or pads, thermocouples are installed within one-eighth of an inch to one-quarter inch of the groove and as close to the center as possible. TEST 3: Service brake warning system test. (b) For vehicles with a GVWR greater than 10,000 pounds, stability and control during braking tests are conducted on a 500-foot-radius curved roadway with a wet level surface having a peak friction coefficient of 0.55 when measured on a straight or curved section of the curved roadway using an ASTM F2493 standard reference tire, in accordance with ASTM E1337-19 at a speed of 40 mph, with water delivery. From 30 mph after the last fade stop, and immediately follow the recovery procedure specified in S5.1.2 and.! 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