Use only ______ fluid from a sealed container. (Inserting the recommended type of brake fluid as specified in 49 CFR 571.116, e.g., DOT 3). Air brakes are more powerful, and have the spring-applied failsafe that will stop the bus in most brake failure situations. S7.4.1.2 Brake adjustment - post burnish. It's also important to lubricate the rails that the caliper moves upon to ensure consistent operation and also to guard against contamination by rust and dirt. Brake power unit means a device installed in a brake system that provides the energy required to actuate the brakes, either directly or indirectly through an auxiliary device, with the operator action consisting only of modulating the energy application level. Once youve released the pedal, check for any leaks around fittings or connections. 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. To pass, applicants must answer 40 questions correctly. %PDF-1.4 % I couldnt tell exactly on my rears but thought it almost looked drum.. but I guess in 2000 it was not dont that way anymore so I probably have disc on that hydro bus. formatting. After burnishing, adjust the brakes in accordance with the manufacturer's published recommendations. S5.5.2 In the event of any failure (structural or functional) in an antilock or variable proportioning brake system, the vehicle shall be capable of meeting the stopping distance requirements specified in S5.1.2 for service brake system partial failure. 0000004837 00000 n When the transmission selector control is required to be in neutral for a deceleration, a stop or snub must be obtained by the following procedures: (b) Close the throttle and coast in gear to approximately 2 mph above the test speed; (d) When the test speed is reached, apply the service brakes. Repeat S7.11 except in S7.11.2 run 15 fade stops or 20 snubs instead of 10. Learn more about the eCFR, its status, and the editorial process. %PDF-1.4 % Average the maximum brake control force required for the three snubs. Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system. Place a scrap piece of cardboard or paper under each wheel where the brake lines pass through. As for brakes, I think any bus longer than 6 rows should have air. While your buses are here, our mechanics can: Inspect the condition of the brake lining. S7.15 Service brake system - fourth effectiveness test. To drive a vehicle with air brakes, you must pass the air brake component of the Georgia CDL knowledge test. and 100 F. If they are freezing up, your air dryer is not working correctly. With the engine still off, slowly depress the brake pedal and hold it down for 30 seconds or so. S7.16 Service brake system - water recovery test. With a moving barrier as described in paragraph 4.3 of SAE Recommended Practice J972 (2000) (incorporated by reference, see 571.5), impact the vehicle from the front at 212 mph. At completion of 10 spike stops, make six effectiveness stops from 60 mph. Apply and hold the service brakes for a minute. 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. S6.4 Transmission selector control. Burnish stops are conducted on any surface. A vehicle equipped with one or more brake power assist units shall meet the requirements of either S5.1.3.1, S5.1.3.2, or S5.1.3.4 (chosen at the option of the manufacturer), and a vehicle equipped with one or more brake power units shall meet the requirements of either S5.1.3.1, S5.1.3.3, or S5.1.3.4 (chosen at the option of the manufacturer). (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. Attain the required deceleration within 1 second and, as a minimum, maintain it for the remainder of the stopping time. Wheel lockup means 100 percent wheel slip. 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. S5.1.3.2 Brake power assist units. 56 0 obj<> endobj Advanced Member, BJ Henderson (f) For a vehicle with electric transmission of the service brake control signal, failure of a brake control circuit. How many seconds should you apply pressure to the brake pedal while doing a hydraulic brake check? here. (b) A drop in the level of brake fluid in any master cylinder reservoir compartment to less than the recommended safe level specified by the manufacturer or to one-fourth of the fluid capacity of that reservoir compartment, whichever is greater. (c) (For vehicles with brake power assist or brake power units with backup systems.) Engineer: Frederick Smith. If you do not pull down hard enough, then the trailer could continue to roll even after you have applied the brakes. The interval from the start of one service brake application to the start of the next shall be either the time necessary to reduce the initial brake temperature to between 230 F. Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus. Load the vehicle to GVWR, release parking brake, and place the transmission selector control to engage the parking mechanism. (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. The pedal should not move. 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, You can learn more about the process 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. (a) (For vehicles with brake power assist units.) 9, 2004. The purpose of this standard is to insure safe braking performance under normal and emergency conditions. Tail Lights/Brake Lights - clean, not missing or broken . Then start here with FREE Practice Tests for Commercial Drivers. ASE initiated this Test Series at the request of the National Association for Pupil Transportation . 0000001403 00000 n https://www.facebook.com/home.php?sk=group_212311114614&ap=1. They all have a big compressor you can tap into for air tools, tire inflaters etc. However, the options provided in S5.3.1(a) shall not apply to a vehicle manufactured without a split service brake system; such a vehicle shall, to meet the requirements of S5.3.1(a), be equipped with a malfunction indicator that activates under the conditions specified in S5.3.1(a)(4). Disc brakes are long lasting and provide safe, even stopping. 0000000556 00000 n Release the spring brake and get the bus moving very slowly. One feature is a completely internal adjustment system which is designed to continually keep the brake in proper adjustment. 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 (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. Scope and application. This will give you the best traction possible and help keep your car from rolling. Except where an adjustment is specified, after each brake application accelerate to 40 mph and maintain that speed until making the next brake application at a point 1 mile from the initial point of the previous brake application. Air Disc Brakes are the way to go, as they become more common. S7.12 Service brake system - second reburnish. (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. 4. Spring Brake Test a. With vehicle at GVWR, disconnect functional power source, or otherwise render antilock system inoperative. Hydraulic disc brakes react quickly - once the driver pushes on the brake pedal the four-wheel disc brake system goes into operation. (when the temperature of components on both ends of an axle are averaged). Record the maximum control force for each snub. 571.105 Standard No. Reservoirs, whether for master cylinders or other type systems, shall have a total minimum capacity equivalent to the fluid displacement resulting when all the wheel cylinders or caliper pistons serviced by the reservoirs move from a new lining, fully retracted position (as adjusted initially to the manufacturer's recommended setting) to a fully worn, fully applied position, as determined in accordance with S7.18(c) of this standard. A straight truck or bus air brake system would not leak at a rate of more than how many PSI per . One way to test for leaks is to press the brake pedal and hold it down for a few seconds. The brake temperature is measured by plug-type thermocouples installed in the approximate center of the facing length and width of the most heavily loaded shoe or disc pad, one per brake, as shown in figure 1. Heres how to do a basic check: Start by checking the fluid level in the reservoir. - Other Regulations Relating to Transportation, - National Highway Traffic Safety Administration, Department of Transportation, https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/part-571/subpart-B/section-571.105. Bahnhof Stage 1 Clutch Kit Fits GMC C6500 C7500 Topkick 7. The CDL General Knowledge practice test covers topics such as the rules of having a CDL and driving a commercial vehicle safety. Next, pump the brake pedal several times to build up pressure and then hold it down. Ask Your Own Medium and Heavy Trucks Question Bus should not move. Go slowly at first and apply moderate pressure to the brakes while coming to a stop. user convenience only and is not intended to alter agency intent Great for long drives. The cast disc (rotor) is bolted to the hub assembly. Bookmark +. Organization and Purpose If the pedal sinks to the floor, there may be a leak in the system. Examine the rotor plate thickness. "Published Edition". This web site is designed for the current versions of This will tell you how much force the system is capable of generating. Determine whether the brake system indicator lamp is activated when the electrical power source to the antilock or variable proportioning unit is disconnected. Reverse Lights - clean, not missing or broken . The Federal Motor Carrier Safety Administration (FMCSA) has developed and issued standards for State testing and licensing of CDL holders. S7.10.1 Regular procedure. Make spike stops by applying a control force of 200 lb while recording control force versus time. (a) For an EV equipped with electrically-actuated service brakes deriving power from the propulsion batteries, and with automatic shut-down capability of the propulsion motor(s), the propulsion batteries are at not more than five percent above the EV actual automatic shut-down critical value. An example would be? S3. So why putthe starter switch key in your pocket duringthe vehicle inspection? (eg: 117. . An auxiliary means may be used to accelerate an EV to test speed. The caliper attaches to and slides within an anchor plate or bracket. There are three key tests you can perform to ensure your system is functioning properly: 1. 1 CFR 1.1 S6.1.1 Other than tests specified at lightly loaded vehicle weight in S7.5(a), S7.7, S7.8, and S7.9, the vehicle is loaded to its GVWR such that the weight on each axle as measured at the tire-ground interface is in proportion to its GAWR, except that each fuel tank is filled to any level from 100 percent of capacity (corresponding to full GVWR) to 75 percent. The indicator lamp shall also be activated as a check of lamp function whenever the ignition is turned to the on (run) position. 2389 turbine oil, the motor weighs approximately 225 pounds. Repeat S7.6. If there are no leaks in the system, you should see the needle on the pressure gauge rise steadily during this time. Since most large trucks have air brakes then why not large school buses. This document is available in the following developer friendly formats: Information and documentation can be found in our Air breaks are pretty fail-safe. Background and more details are available in the Air brakes use air pressure to push against the brake pads, slowing or stopping the wheels from spinning. startxref Initial brake temperatures before brake application for subsequent snubs are those occurring in the time intervals specified below. Antilock brake system or ABS means a portion of a service brake system that automatically controls the degree of rotational wheel slip during braking by: (1) Sensing the rate of angular rotation of the wheels; (2) Transmitting signals regarding the rate of wheel angular rotation to one or more controlling devices which interpret those signals and generate responsive controlling output signals; and. The second feature is a unique cam design that applies the brake shoe. S5.1.4.1 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 pounds and 90 pounds. (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. Next, start the engine and let it idle for a few minutes to warm up the hydraulic fluid. S7.1 Brake warming. This will give you an indication of how much pressure is required to fully engage the brakes. If the vehicle is equipped with an adjustable engine speed governor, it is adjusted according to the manufacturer's recommendation. (b) The friction surface of the brake, the master cylinder or brake power unit reservoir cover and seal and filler openings, for leakage of brake fluid or lubricant. 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. S6.10.2 For vehicles with a GVWR greater than 10,000 pounds, stops are made with wheel lockup permitted only as follows: (a) At vehicle speeds above 20 mph, any wheel on a nonsteerable axle other than the two rearmost nonliftable, nonsteerable axles may lock up for any duration. or less shall be capable of making 10 spike stops from 30 mph, followed by 6 effectiveness (check) stops from 60 mph, at least one of which shall be within a corresponding stopping distance specified in column I of table II. Step on the brake and hold the pedal down for one minute. If you work for a Federal agency, use this drafting S5.1.6 Spike stops. Restore the system to normal at completion of this test. If you have questions or comments regarding a published document please 0000000016 00000 n Is it because school bus operators are too cheap to train their drivers? Bookmarked content can then be accessed anytime on all of your logged in devices! Displaying title 49, up to date as of 2/27/2023. 1/1.1 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. If the pressure is too low, it will not engage the brakes properly.
What Is The Nature Of Your Relationship With The Applicant Answer, What Happened To Charlie Coates Oitnb, Articles H