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Tractor protection valve old 379 Pete

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Sep 13, 2023.

  1. Sep 13, 2023 #1
    mile marker 27

    mile marker 27 Road Train Member

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    Tractor protection valve is leaking when brake is applied when trailer attached. Pinched off each service line, one at a time on the trailer brakes but valve on truck is still leaking. Bad TPV or something else? IMG_4462.jpeg
     
    mile marker 27, Sep 13, 2023
    mile marker 27, Sep 13, 2023
    #1
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  3. Sep 13, 2023 #2
    Goodysnap

    Goodysnap Road Train Member

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    Block off both gladhands on tractor. Release trailer brake. The air leaks out exhaust with service brake applied= bad TP valve.
     
    Goodysnap, Sep 13, 2023
    Goodysnap, Sep 13, 2023
    #2
    Bigtruckdrivah, Keepforgettingmypassword, Coolbreezin and 1 other person Thank this.
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