Trailer brake release valve issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Badmon, Nov 30, 2022.

  1. Badmon

    Badmon Heavy Load Member

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    Oct 6, 2014
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    I cannot for the life of me keep this red button pushed IN to supply air to the trailer when the tractor brake is also released. The trailer brake will stay released on its own, but once you press the tractor release, that trailer valve is coming back out

    Anyone have a clue
     
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  3. Lyle H

    Lyle H Heavy Load Member

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    Apr 16, 2014
    0
    Not sure of proper terminology but something inside that tractor/trailer valve combo is getting weak. A check valve of some sort I would guess.
    You probably have to hold in the trailer button at the same time you press in the tractor button right?
    My guess is you probably have to replace that whole valve.
    But that’s just a guess. Mine does it too under certain circumstances.
     
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