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2. 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 ...

3. 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.

4. Railway air brake - Wikipedia

   en.wikipedia.org/wiki/Railway_air_brake

   These valves cut off the air from the train line and vent the coupling hoses for uncoupling cars. The air brake only operates if the angle cocks are open except the ones at the front of the locomotive and at the end of the train. [11] The air brake can fail if one of the angle cocks is accidentally closed.

5. Driver's brake valve - Wikipedia

   en.wikipedia.org/wiki/Driver's_brake_valve

   The driver's brake valve is a complicated valve system for controlling the compressed air brake of a railway vehicle. [1] Depending on its setting, it controls whether the brake pipes of a compressed air brake are evacuated and thus whether braking is applied or maintained; or if the brake pipes are connected to a compressed air reservoir, it ...

6. Electro-pneumatic brake system on British railway trains

   en.wikipedia.org/wiki/Electro-pneumatic_brake...

   It operates at 10 bar and in addition to feeding each brake cylinder reservoir also provides air for the secondary suspension systems (air bags) and power doors. Each brake reservoir stores air at a pressure of 7 bar and is fed via a pressure reducing valve off the main reservoir pipe. The driver's brake handle passes control voltages down ...

7. 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]

8. Steam locomotive components - Wikipedia

   en.wikipedia.org/wiki/Steam_locomotive_components

   Air pump / Air compressor Westinghouse pump (US+) Powered by steam, it compresses air for operating the train air brake system. [3]: 2 The Westinghouse air brake system is used world-wide; [3]: 93 in Europe two systems that use the same principle are the Kunze-Knorr and Oerlikon systems. It can be a single-stage or, when larger capacity is ...

9. Compression release engine brake - Wikipedia

   en.wikipedia.org/wiki/Compression_release_engine...

   A compression release engine brake, compression brake, or decompression brake is an engine braking mechanism installed on some diesel engines. When activated, it opens exhaust valves to the cylinders, right before the compression stroke ends, releasing the compressed gas trapped in the cylinders, and slowing the vehicle.