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2003 379 Tractor/Trailer valve leaking

Discussion in 'Peterbilt Forum' started by Hammerdowntrucking, Apr 7, 2015.

  1. Apr 7, 2015 #1
    Hammerdowntrucking

    Hammerdowntrucking Bobtail Member

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    Apr 18, 2014
    0
    I have a 2003 379 EXHD. Tractor/Trailer valve on dash leaks when I try to set the trailer brakes. If there is no air in the system and I build up pressure the valve doesn't leak. At full pressure the valve starts leaking when I try to set the trailer brakes. I have replaced the valve. Any help would be great. Thanks
     
    Hammerdowntrucking, Apr 7, 2015
    Hammerdowntrucking, Apr 7, 2015
    #1
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  3. Apr 8, 2015 #2
    Mark Kling

    Mark Kling Technology Contributor

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    I had this once and it turned out to be a leak on the trailer. I had tore the dash apart looking for the leak.
     
    Mark Kling, Apr 8, 2015
    Mark Kling, Apr 8, 2015
    #2
    Hammerdowntrucking Thanks this.
  4. Apr 8, 2015 #3
    icsheeple

    icsheeple Trailing the Herd

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    Yeah, the valves will hiss when there is a good sized leak. I'd check outside the truck and trailer. Get some soapy water.
     
    icsheeple, Apr 8, 2015
    icsheeple, Apr 8, 2015
    #3
    Hammerdowntrucking Thanks this.
  5. Apr 8, 2015 #4
    tompetty69

    tompetty69 Light Load Member

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    Jan 9, 2015
    TX Panhandle
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    A mechanic told me the best place to start looking for the leak when that happens is by checking the brake chambers on the trailer. He told me how, but I can't put my hands on my notes right now.
     
    tompetty69, Apr 8, 2015
    tompetty69, Apr 8, 2015
    #4
    Hammerdowntrucking Thanks this.
  7. Apr 8, 2015 #5
    Hammerdowntrucking

    Hammerdowntrucking Bobtail Member

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    Apr 18, 2014
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    That mechanic was right. Bad brake chamber on the trailer. Thanks for the help!!
     
    Hammerdowntrucking, Apr 8, 2015
    Hammerdowntrucking, Apr 8, 2015
    #5
  8. Apr 14, 2015 #6
    Loaderlou

    Loaderlou Medium Load Member

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    Feb 24, 2014
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    My friend taught me how to check
     
    Last edited: Apr 14, 2015
    Loaderlou, Apr 14, 2015
    Loaderlou, Apr 14, 2015
    #6
  9. Apr 14, 2015 #7
    Loaderlou

    Loaderlou Medium Load Member

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    Feb 24, 2014
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    My friend taught me how to check that out by clamping vise grips to the supply lines of each maxi can on the trailer, than one by one remove one and listen and watch your air gauge. Does that ring a bell?
     
    Loaderlou, Apr 14, 2015
    Loaderlou, Apr 14, 2015
    #7
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