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air leak from gladhands


mackr1989

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a bad maxi should leak as soon as the brakes are released. if it only leaks when the tractor or trailer brakes are applied with out the red knob energized its a faulty tractor protection valve. to test charge trailer and pop the supply glad hand off it should exhaust air until the air tank pressure reaches 60 psi the red knob should pop out, and stop the flow of air. if the knob pops out then step on the treadle valve no air should come out of the glad hand if it does replace the tractor protection valve.

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