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.
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.
Source:PoultryABC.com
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