The test takes place with the It keeps kids more active. S5.1.7 Stability and control during braking. endstream endobj 7 0 obj<> endobj 9 0 obj<> endobj 10 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 11 0 obj<> endobj 12 0 obj<> endobj 13 0 obj<>stream Medium-duty vehicles (buses, straight trucks) can be ordered with either air or hydraulic. TEST 2: Applied pressure test. 1 Depleted. Air very much does apply the service brake. Top rated: 3 Lowest rating: 1 Summary of article content: Articles about To test for leaks on hydraulic brake systems: - CDL prep To test for leaks on hydraulic brake systems:: Pump pedal 3 times, then apply firm pressure and hold, Pump pedal 3 times, then get out and look under the 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. A. Texas General Knowledge CDL Practice Test. Each brake power unit reservoir servicing only the brake system shall have a minimum capacity equivalent to the fluid displacement required to charge the system piston(s) or accumulator(s) to normal operating pressure plus the displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoir or accumulator(s) move from a new lining fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position. 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, S5.2.2 A vehicle of a type described in S5.2.1 at the option of the manufacturer may meet the requirements of S5.2.2.1, S5.2.2.2, and S5.2.2.3 instead of the requirements of S5.2.1 if: (a) The vehicle has a transmission or transmission control which incorporates a parking mechanism, and. 2023 School Bus Fleet Magazine, Bobit. Control force readings may be terminated when vehicle speed falls to 5 mph. This situation can create a variety of problems like brake pedal pulsation during brake application, increased piston seal wear and abnormal pad wear. The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. The types of vehicles and operations requiring a CDL are outlined below. This is especially important on large vehicles such as trucks and buses which require a lot of stopping power. Hydraulic brakes are used on passenger vehicles and use brake fluid to operate the brakes. Second, it prevents them from accidentally starting your engine (which could be dangerous). Serving Car & Truck Fleet Management Professionals, Serving EV Intenders & Professionals In Commercial & Public Fleets, Serving Corporate, Executive, & Financial Managers Of Large Commercial Fleets, Serving Leaders In Fleet Mobility & Emerging Technology, Serving Public Sector Fleet Professionals, Serving Medium & Heavy Duty Commercial Truck Professionals, Serving Transit Bus, Private Motorcoach, & Passenger Rail Professionals, Serving School & Pupil Transportation Fleet Professionals, Serving Vocational & Service Fleet Professionals. S7. Make 15 stops, each from 60 mph, with the backup system activated for the failed subsystem, to achieve an average deceleration of 12 fpsps for each stop. S5.1.1.3 In the third effectiveness test the vehicle shall be capable of stopping at lightly loaded vehicle weight from 60 mph within the corresponding distance specified in column III of table II. Service Brake Test a. Bus should not move. S6.2.6 A vehicle equipped with electrically-actuated service brakes also performs the following test series. Engineer: Manuel Maldonado. 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. I think the air brake shoes do last longer and thats nice because I dont care for lugging those inboard drums!! S5.2.1. S7.16.1 Baseline check stop. Table I - Brake Test Procedure Sequence and Requirements, Table III - Inoperative Brake Power Assist and Brake Power Units. 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. Search & Navigation With the engine off, pump the brake pedal several times to build up pressure in the system. In Florida, anything that has an Air Brake option is so equipped. Learn more about the eCFR, its status, and the editorial process. See this. Establish an initial brake temperature before the first brake application of 130 F. FAR). The brake pedal should not move (depress) during the five seconds. By regularly performing these three tests, you can catch potential problems early and keep your hydraulic system running smoothly. Control force readings may be terminated when vehicle speed falls to 5 mph. 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. (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.). 0000000778 00000 n they are hydro boost with a backup electric motor that operates the assist in case of engine failure. Scope. S5.1.5.1 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 and 90 pounds. Navigate by entering citations or phrases (B) The average control force for the baseline check times 0.60. whichever is lower (but in no case lower than 5 pounds). You also need to make sure that there is no air in the system, as this can cause problems with braking performance. 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. pressure to operate the bus. (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. Need to Pass your CDL School Bus Endorsement Test! If you feel unsafe at any time, move to a different location. S5.1.4 Fade and recovery. (b) (For vehicles with brake power units with accumulator type systems.) While disc brakes don't need adjustment, wheel bearings do. S7.4.2.1 Burnish. S7.4.1.2 Brake adjustment - post burnish. Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes? Facebook Page: Blue Bird Corporation Fans. Hydraulic brakes work by using fluid pressure to go against the brake pads. Test questions come from the Ohio Commercial Drivers License Manual. Hydraulic brake system means a system that uses hydraulic fluid as a medium for transmitting force from a service brake control to the service brake, and that may incorporate a brake power assist unit, or a brake power unit. This will tell you how quickly fluid can move through the system. Use only heavy-duty brake fluid, DOT 3. 49 CFR 172.101 Hydraulic brakes are a vital part of your vehicle, and its important to keep them in good working order. (c) Test as in S7.7.1 except on a 20 percent grade, with the parking mechanism not engaged. Check the fluid level in the hydraulic brake reservoir. %%EOF School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. However, if you have the key in your pocket during the inspection, they wont be able to test it properly. Another way to test for leaks is to check the fluid level in the reservoir. With the traction battery pack fully charged, it is capable of approximately an 70 mile range at a constant 45 mile per hour velocity. Backup system means a portion of a service brake system, such as a pump, that automatically supplies energy, in the event of a primary brake power source failure. This will tell you how much force the system is capable of generating. Step on the service brake to make sure the bus doesn't pull to either side. All buses using hydraulic brake systems must be equipped with emergency brakes and parking brakes. When brake fluid becomes contaminated, it can cause problems with the brakes. Make four stops, each from 60 mph. (b) Service brake system - second effectiveness test. S7.1 Brake warming. (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. Air brakes are used on most large commercial vehicles and use compressed air to operate the brakes. ` PT, bPl ,y\BBK- } 16. Oklahoma CDL Brake Check Pre-Trip Inspection Parking Brake Check Apply parking brake only and shift into a lower gear. I'll tell you soon.. If the speed attainable in 2 miles is not less than 99 mph, a passenger car shall, in addition, be capable of stopping from the applicable speed indicated below, within the corresponding distance specified in column I of table II. Maintain control force until vehicle has stopped. I drive in Florida as welland most definitely prefer air brakes over hydraulic brakes. 25. 0000004589 00000 n S7.7.3 Lightly loaded vehicle. (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. Our practice tests are designed to help you learn the material in the CDL Handbook, Each question is multiple choice and will provide instant feedback. Mounts & Chargers. Regenerative braking system or RBS means an electrical energy system that is installed in an EV for recovering or dissipating kinetic energy, and which uses the propulsion motor(s) as a retarder for partial braking of the EV while returning electrical energy to the propulsion batteries or dissipating electrical energy. On School bus test care for lugging those inboard drums! vehicle speed falls to 5 mph i! Pedal should not move ( depress ) during the inspection, they wont be to. 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