If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. S6.6 Vehicle openings. trailer parking brake on. So why putthe starter switch key in your pocket duringthe vehicle inspection? S7.10 Service brake system - inoperative brake power unit or brake power assist unit test. This means that the hydraulic pressure required to stop the car wont be achieved, and your brakes may not work properly. A master cylinder shall have a reservoir compartment for each service brake subsystem serviced by the master cylinder. S7.11.2.1 Vehicles with GVWR of 10,000 pounds or less. A split-second delay in brake reaction is present in all air brake systems. S6.10 Vehicle position and wheel lockup restrictions. The lettering shall be -. 2 - 3 B. The Office of the Federal Register publishes documents on behalf of Federal agencies but does not have any authority over their programs. (e) Unlimited wheel lockup is allowed during partial failure stops, and inoperative brake power or power assist stops. S5.1.6 Spike stops. To prevent this from happening, its important to check your brake fluid level regularly and top it up if necessary. Fig. Release the spring brakes. 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. Second, it prevents them from accidentally starting your engine (which could be dangerous). To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. 571.105 (S5.2) in effect at the time of manufacture. School Bus Test: Standard regulation on school bus pedestrian safety devices - school bus test. TEST 2: Applied pressure test. S6.15 Selection of compliance options. endstream endobj 57 0 obj<> endobj 59 0 obj<> endobj 60 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 61 0 obj<> endobj 62 0 obj<> endobj 63 0 obj<> endobj 64 0 obj<> endobj 65 0 obj<> endobj 66 0 obj<> endobj 67 0 obj<>stream School buses with their steel frames and steel bodies are heavy vehicles, even when empty. 7 . (e) For a vehicle with electrically-actuated service brakes, failure of the source of electric power to the brakes, or diminution of state of charge of the batteries to less than a level specified by the manufacturer for the purpose of warning a driver of degraded brake performance. Initial brake temperature means the average temperature of the service brakes on the hottest axle of the vehicle 0.2 mi before any brake application. A. (b) The indicator lamps need not be activated when a starter interlock is in operation. It can also cause corrosion in the brake system. Pre-trips should only take a few minutes, so make sure youre efficient. S7.17 Spike stops. There's a reason big rigs have air brakes! If there are any leaks, you should see fluid dripping onto the cardboard or paper below. The drivers seat is often a cushy air suspension seat. Repeat S7.4, except make 35 burnish stops or snubs. Stability and control during braking (braking-in-a-curve test), 8. 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. S7.9.3 Repeat S7.9.1 and S7.9.2 with vehicle at GVWR. Conduct 10 stopping tests from a speed of 100 kph or the maximum vehicle speed, whichever is less. S5.1.3.1 The service brakes on a vehicle equipped with one or more brake power assist units or brake power units, with one such unit inoperative and depleted of all reserve capability, shall be capable of stopping a vehicle from 60 mph within the corresponding distance specified in column IV of table II. 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. 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. After each stop (except the last), accelerate the vehicle immediately at a maximum rate to a speed of 30 mph and begin the next stop. The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. To test the hydraulic brake booster, start by pumping the pedal slowly and evenly until you feel resistance. Disc brake systems use a two-piston sliding caliper at the steer axle and drive axle; older buses may utilize a single-piston caliper. 5 - 10 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. Application. All mechanical components of the braking system shall be intact and functional. For an EV, the speed attainable in 2 miles is determined with the propulsion batteries at a state of charge of not less than 95 percent at the beginning of the run. I Vote Air Brakes, I agree about that they lock up, and you can't move, instead of that I can't stop. S5.6 Brake system integrity. Splash Guards/Mud Flaps - mounted, not damaged . easy to follow sequencing for each section of the vehicle;. If instrument repair, replacement, or adjustment is necessary, make not more than 10 additional stops or snubs after such repair, replacement, or adjustment. 1. If both tests are successful with no issues found, your hydraulic brakes are functioning properly! With transmission in neutral (or declutched), make three snubs from 40 to 20 mph at 10 fpsps for each snub. This self-paced course gives you: more than 100 practice test questions with feedback; EASY step-by-step instructions how to conduct a pre-trip inspection on an air brake system; DETAILED rules to use air brakes and brake downhill with a large vehicle . The wind velocity is zero. Remove old certificate. Choosing an item from This contact form is only for website help or website suggestions. Bookmark +. Beats leaf springs all to hell. Because disc brakes are able to dissipate heat efficiently and quickly, there's less wear to the brake pad. Then make six stops from 60 mph. Use a full brake application for the duration of the stop, with the clutch pedal depressed or the transmission selector control in the neutral position, for the duration of each stop. 135. However, if you have the key in your pocket during the inspection, they wont be able to test it properly. 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. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. With vehicle at GVWR, disconnect functional power source, or otherwise render antilock system inoperative. S7.12 Service brake system - second reburnish. Regulation Y 3. "Published Edition". 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. Then (for passenger cars) make four stops from either 95 mph if the speed attainable in 2 mi is 99 to (but not including) 104 mph, or 100 mph if the speed attainable in 2 mi is 104 mph or greater. Drivers 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. pressure to operate the bus. The battery or batteries providing power to those electrically-actuated brakes, at the beginning of each test, shall be in a depleted state of charge for conditions (a), (b), or (c) of this paragraph as appropriate. This standard specifies requirements for hydraulic and electric service brake systems, and associated parking brake systems. They feel sooooo much more confident in a heavy vehicle. trailer The second thermocouple shall be installed at .080 inch depth within 1 inch circumferentially of the thermocouple installed at .040 inch depth. Hydraulic brakes are components of a vehicles braking system that use fluid pressure to transfer force from the pedal to the wheels. S7.9 Service brake system test - partial failure. As for brakes, I think any bus longer than 6 rows should have air. 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. Test for stopping (25) 2. S5.3.1 An indicator lamp shall be activated when the ignition (start) switch is in the on (run) position and whenever any of the conditions (a) or (b), (c), (d), (e), (f), and (g) occur: (a) A gross loss of pressure (such as caused by rupture of a brake line but not by a structural failure of a housing that is common to two or more subsystems) due to one of the following conditions (chosen at the option of the manufacturer): (1) Before or upon application of a differential pressure of not more than 225 lb/in2 between the active and failed brake system measured at a master cylinder outlet or a slave cylinder outlet. Oh yeah hydraulics are also nice because not all of my drivers are licensed for air brakes. A school bus shall not a. multiple choice questions that will test your understanding of terminology. The RBS is operational during all burnishes and all tests, except for the test of a failed RBS. Vehicles with air brakes may use either drum or disc type components. See this. You can learn more about the process 0000000954 00000 n Bookmarked content can then be accessed anytime on all of your logged in devices! Use only heavy-duty brake fluid, DOT 3. The in-page Table of Contents is available only when multiple sections are being viewed. Wheel bearings must be properly adjusted to limit excessive lateral run-out or wobble in the disc brake rotors. Compliance of vehicles manufactured in two or more stages may, at the option of the final-stage manufacturer, be demonstrated to comply with this standard by adherence to the instructions of the incomplete manufacturer provided with the vehicle in accordance with 568.4(a)(7)(ii) and 568.5 of title 49 of the Code of Federal Regulations. (b) Any visible brake fluid or lubricant on the friction surface of the brake, or leakage at the master cylinder or brake power unit reservoir cover, seal and filler openings. Enhanced content is provided to the user to provide additional context. Accelerate to 40 mph after each stop and maintain that speed until making the next stop. S5.1.3 Inoperative brake power assist unit or brake power unit. Step on the brake and hold the pedal down for one minute. Advanced Member, BJ Henderson Air breaks are pretty fail-safe. Gently pull against the brake by releasing the clutch, and it should hold the vehicle. Each vehicle shall be capable of completing all performance requirements of S5 without -. Words in addition to those required by Standard No. Inoperative brake power and power assist units. Is it because school bus operators are too cheap to train their drivers? xref The service brakes of a vehicle equipped with one or more brake power assist units or brake power units with a backup system, with one brake power assist unit or brake power unit inoperative and depleted of all reserve capability and with only the backup system operating in the failed subsystem, shall be capable of stopping the vehicle from 60 mph in 15 consecutive stops at an average deceleration for each stop that is not lower than 12 fpsps (equivalent stopping distance 323 feet). S7.4.1.2 Brake adjustment - post burnish. S6.5 Engine. The squeaking is the air escaping after braking and the ppssss sound is the automatic bypass safety valves at work, ensuring the air pressure remains at the correct level. Engineer: Frederick Smith. Then start here with FREE Practice Tests for Commercial Drivers. 2023 School Bus Fleet Magazine, Bobit. For vehicles with a GVWR of 10,000 pounds or less, or any school bus, make six stops from 30 mph. 58 0 obj<>stream Not just because I've been in the truck world too long either. Each vehicle shall have a brake system indicator lamp or lamps, mounted in front of and in clear view of the driver, which meet the requirements of S5.3.1 through S5.3.5. Spring Brake Test a. 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. And third, it makes sure that they dont forget to turn off your engine before they start inspecting other parts of your car. If it does, there may be a leak. Navigate by entering citations or phrases Record the maximum control force for each stop. 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. (b) The service brakes shall be capable of stopping each vehicle with a GVWR of between 8,000 pounds and 10,000 pounds, other than a school bus, in three effectiveness tests within the distances and from the speeds specified in S5.1.1.1, S5.1.1.2, and S5.1.1.4. (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. On each vehicle with a GVWR greater than 10,000 pounds but not greater than 19,500 pounds and motor homes with a GVWR greater than 10,000 pounds but not greater than 22,500 pounds manufactured before March 1, 2001, the antilock brake system may also directly control the wheels of the rear drive axle by means of a single sensor in the driveline. (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. Taking this 50 question Texas CDL practice test will help you prepare for the exam by proving valuable insight into the areas you need to review more thoroughly. Make sure the vehicle is on the level surface and the air pressure is within the normal operating range (cut-out and cut-in). Vehicles are burnished according to the following procedures. S7.13 Service brake system - second fade and recovery test. Parking mechanism means a component or subsystem of the drive train that locks the drive train when the transmission control is placed in a parking or other gear position and the ignition key is removed. contact the publishing agency. (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. 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. Search & Navigation 0000004837 00000 n Step on the service brake to make sure the bus doesn't pull to either side. If the brake power or brake power assist unit operates in conjunction with a backup system and the backup system is activated automatically in the event of a primary power failure, the backup system is operative during this test. 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