Air leak on firewall 2018 peterbilt

Discussion in 'Flatbed Trucking Forum' started by David mcgill, May 9, 2021.

  1. David mcgill

    David mcgill Bobtail Member

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    May 9, 2021
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    So on the firewall u have the manifold with all airlines the one next to it is just capped off well it looks like one of the caps blew out now when I go to engage or did engage I here air and feel air coming out takes forever to set breaks or release trailer brakes if u cap it off then u can't disengage brakes this morning went to leave and now my tractor brakes won't disengage
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Some valves have a vent tube out the firewall. Maybe supposed to be open. Check the hand valve is fully released.
    A bit more information would help. Service brakes, parking brakes etc.
    It you turn off the engine with truck in gear. Pull the parking brake knobs. Then go disconnect the trailer glad hands. Any air still there?
     
  4. beastr123

    beastr123 Road Train Member

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    Check that somebody hasn't swapped your glad-hands around or blocked the red line at the glad-hand.
     
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  5. Isafarmboy

    Isafarmboy Road Train Member

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    Be nice if they'd confirm. A simple yup or nay would do.
     
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  6. cke

    cke Road Train Member

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    @David mcgill did you figure out what was wrong.
     
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