Tractor protection valves are often positioned at the back of the cab. In the case of a trailer breakaway or significant air leak, it is their responsibility to safeguard the tractor air brake system. Before disconnecting the cables, they are also utilized to turn off the air supply to the trailer.
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At what PSI will the tractor protection valve open?
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.
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