Pneumatic brakes, or air brakes or compressed air brakes, use compressed air generated by a compressor and stored in a reservoir. When the operator actuates the lever or pedal, a valve allows the ...

Pneumatic brake and clutch assemblies are equipment drive components that consist of pneumatic brakes for slowing or stopping shafts and pneumatic clutches for connecting or disconnecting shafts.

Semis and similarly sized vehicles, like buses, have air brakes, and that sound is made by the safety valves resetting the ...