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ONE WAY CHECKING VALVE
Valve prevents air from getting back into the compressor from the air reservoir.if air flows back brakes will not work.
TRACTOR PARKING VALVE
Hand controlled know can be push in to release the tractor parking brake and pulled out to set the parking brakes.
RELAY VALVE
Valve Is used to speed up the application and release of the rear wheel brakes.relay valve is responsible for making sure that all brakes apply at the sametime..
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