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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 is generally used in heavy trucking applications or commercial vehicles where an air supply is readily available from the vehicle. It is normally powered by air, but hydraulic power can be used too. The S-cam foundation brake is being used in over 85% of vehicles in the U.S. that run with air brakes. [1]

  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. Gladhand connector - Wikipedia

    en.wikipedia.org/wiki/Gladhand_connector

    A pair of gladhand connectors between railroad cars A gladhand connector on a trailer. A gladhand connector or gladhand coupler is an interlocking hose coupling fitted to hoses supplying pressurized air from a tractor unit to air brakes on a semi-trailer, [1] or from a locomotive to railway air brakes on railroad cars. [2]

  6. 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).

  7. Air brake - Wikipedia

    en.wikipedia.org/wiki/Air_brake

    Air brake (aeronautics), a type of flight control system used on aircraft to reduce speed; On ground vehicles, (more formally, specified as) compressed-air-actuated braking systems: Air brake (road vehicle), friction-mediated type of brake used on large road vehicles in place of hydraulic brakes; Railway air brake (used on both locomotives, and ...

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