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2. Air brake (road vehicle) - Wikipedia

   en.wikipedia.org/wiki/Air_brake_(road_vehicle)

   Truck air-actuated disc brake. An air brake or, more formally, a compressed-air-brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to both release the parking/emergency brakes in order to move the vehicle, and also to apply pressure to the brake pads or brake shoes to slow and stop the vehicle.

3. S-cam - Wikipedia

   en.wikipedia.org/wiki/S-cam

   The S-cam foundation brake is being used in over 85% of vehicles in the U.S. that run with air brakes. [1] S-cam's are only used with drum brakes because the cam pushes on the brakes which rubs against the rotating drum, and thus slowing the vehicle. [2]

4. Relay valve - Wikipedia

   en.wikipedia.org/wiki/Relay_valve

   Relay valves are tested for durability before use through a seat test with air. In pressure at 80 psig or more, a 2-inch or smaller relay valve should not be tested for less than 15 seconds under pressure or for less than 30 seconds if it is at 3 inches in size.

5. Trucking industry in the United States - Wikipedia

   en.wikipedia.org/wiki/Trucking_industry_in_the...

   Acquiring a CDL requires a skills test (driving test), and knowledge test (written test) covering the unique handling qualities of driving a large, heavily loaded 18-wheeler (e.g., backing maneuvers), and the mechanical systems required to operate such a vehicle (e.g., air brakes and vehicle inspection procedures). [58]

6. United States commercial driver's license training - Wikipedia

   en.wikipedia.org/wiki/United_States_Commercial...

   A CDL training truck on the range. Commercial driver's license training (or CDL training) is a specialized instructional program or course designed to prepare a student to obtain a commercial driver's license (CDL), which is required for a career as a truck driver in the United States. During training, students are taught the necessary ...

7. CDL skills test changes to aid would-be truckers, ease bus ...

   www.aol.com/finance/cdl-skills-test-changes-aid...

   Aug. 21—Pending changes to Pennsylvania's commercial driver's license skills test should make the road a more attainable destination for would-be truck drivers without compromising highway ...