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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. 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]

  4. S-cam - Wikipedia

    en.wikipedia.org/wiki/S-cam

    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] 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]

  5. 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 ...

  6. Railroad Safety Appliance Act - Wikipedia

    en.wikipedia.org/wiki/Railroad_Safety_Appliance_Act

    [3] Its first section makes it unlawful, among other things, for a railroad company engaged in interstate commerce to run any train without having a sufficient number of the cars so equipped with train brakes (such as air brakes) that the engineer on the locomotive can control the speed of the train without requiring brakemen to use a hand ...

  7. Braking distance - Wikipedia

    en.wikipedia.org/wiki/Braking_distance

    Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop. It is primarily affected by the original speed of the vehicle and the coefficient of friction between the tires and the road surface, [Note 1] and negligibly by the tires' rolling resistance and vehicle's air drag.

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