Tractor protection valves are often positioned at the back of the cab. In case of a trailer breakaway or significant air leak, they are responsible for safeguarding the tractor air brake system. Before disconnecting the cables, they are also utilized to turn off the air supply to the trailer.
Tractor protection valve function
The tractor protection valve is designed to safeguard the tractor air brake system. Air enters through the tractor protection valve’s bottom and charges the trailer through the supply line when the trailer-supply valve is open.
How to tell if tractor protection valve is bad
The trailer service line must be turned off, and the service brakes must be engaged in order to test the tractor protection valve. There shouldn’t be any air escaping the trailer service line. If air escapes from the service line, there is a problem with the tractor protection valve.
What does it mean if the red valve is pulled out?
The red valve on the dash pulls out in the case of a loss of tractor air pressure, cutting off airflow from the tractor to the trailer. This will lock up all of the trailer’s wheels at once and automatically activate the sprung brakes on the trailer.
At what PSI will the tractor protection valve?
The tractor protection valve’s service line port opens when the supply line’s pressure hits 45 psi. As a result, when the brake is applied, application air pressure can move via the service line to the trailer.
Source:PoultryABC.com
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