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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. Commercial driver's license - Wikipedia

   en.wikipedia.org/wiki/Commercial_driver's_license

   A commercial driver's license is required to operate a tractor-trailer for commercial use. A commercial driver's license (CDL) is a driver's license required in the United States to operate large and heavy vehicles (including trucks, buses, and trailers) or a vehicle of any size that transports hazardous materials or more than 15 passengers (including the driver).

4. Relay valve - Wikipedia

   en.wikipedia.org/wiki/Relay_valve

   A relay valve is an air-operated valve typically used in air brake systems to remotely control the brakes at the rear of a heavy truck or semi-trailer in a tractor-trailer combination. Relay valves are necessary in heavy trucks in order to speed-up rear-brake application and release, since air takes longer to travel to the rear of the vehicle ...

5. Spanish translation now available for CDL written test - AOL

   www.aol.com/spanish-translation-now-available...

   Jul. 12—Illinois residents applying for Commercial Driver's Licenses (CDL) can now take their written test in Spanish thanks to a new initiative to increase accessibility and address truck and ...

6. Truck driver - Wikipedia

   en.wikipedia.org/wiki/Truck_driver

   Acquiring a CDL requires a skills test (pre-trip inspection and driving test) and knowledge test (written) covering the unique handling qualities of driving a large, heavily loaded commercial vehicle, and the mechanical systems required to operate such a vehicle (air brakes, suspension, cargo securement, et al.), must be declared fit by medical ...

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

   www.aol.com/entertainment/cdl-skills-test...

   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 ...