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trailer air supply problem

Discussion in 'Peterbilt Forum' started by comebackkid79, Aug 4, 2016.

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  1. Aug 4, 2016 #1
    comebackkid79

    comebackkid79 Bobtail Member

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    Aug 4, 2016
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    Hey all, new to this site, please bear with me. I own an '89 Pete 379, just recently I picked up a reefer type trailer for someone that had been sitting for over 16 years. Brakes did not release, had to cage. Ever since then I've had issues with air flowing to trailer supply and to the point where now you push in the red supply button on dash and when glad hands are disconnected, no air comes out. Thought it was a bad valve behind the dash. Anyone got any suggestions as to what the issue might be? I'm kind of stumped.. Thanks in advance
     
    comebackkid79, Aug 4, 2016
    comebackkid79, Aug 4, 2016
    #1
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  3. Aug 4, 2016 #2
    BigPerm

    BigPerm Medium Load Member

    511
    304
    Sep 4, 2012
    Fron Calif, NM, NV, & now TX.
    0
    Tractor protection valve. Does air come out of the blue/application side when hit the brakes/trolley valve?
     
    BigPerm, Aug 4, 2016
    BigPerm, Aug 4, 2016
    #2
  4. Aug 4, 2016 #3
    comebackkid79

    comebackkid79 Bobtail Member

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    Aug 4, 2016
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    No
     
    comebackkid79, Aug 4, 2016
    comebackkid79, Aug 4, 2016
    #3
  5. Aug 4, 2016 #4
    BigPerm

    BigPerm Medium Load Member

    511
    304
    Sep 4, 2012
    Fron Calif, NM, NV, & now TX.
    0
    Check supply @ T.P. valve, and work back to foot valve. After that logical stuff, someone more knowledgeable will Prolly chime in, but you have a supply problem. Don't be dragging any trailers around until it's fixed.
     
    BigPerm, Aug 4, 2016
    BigPerm, Aug 4, 2016
    #4
  7. Aug 4, 2016 #5
    comebackkid79

    comebackkid79 Bobtail Member

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    Aug 4, 2016
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    Ok will do. Thanks!
     
    comebackkid79, Aug 4, 2016
    comebackkid79, Aug 4, 2016
    #5
  8. Aug 4, 2016 #6
    Old school 362

    Old school 362 Medium Load Member

    392
    249
    Mar 6, 2016
    Pensacola Fl
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    Is the trailer brake staying Released .
     
    Old school 362, Aug 4, 2016
    Old school 362, Aug 4, 2016
    #6
  9. Aug 4, 2016 #7
    BigPerm

    BigPerm Medium Load Member

    511
    304
    Sep 4, 2012
    Fron Calif, NM, NV, & now TX.
    0
    He already caged the spring brakes. No air out a both gladhands.....no trailer brakes.
    OT: When I test drive a new hire...two questions;
    1.) What does the power divider / axle interlock do, and when should you use it?
    2.) What does the T.P. valve/ "red" knob do?
    No know...NO PASS!!!

    Arghh!
     
    BigPerm, Aug 4, 2016
    BigPerm, Aug 4, 2016
    #7
    Bean Jr. Thanks this.
  10. Aug 5, 2016 #8
    Old school 362

    Old school 362 Medium Load Member

    392
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    Mar 6, 2016
    Pensacola Fl
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    Remove dash valve and check for air supply. Think your dash valve is toast
     
    Old school 362, Aug 5, 2016
    Old school 362, Aug 5, 2016
    #8
  11. Aug 6, 2016 #9
    comebackkid79

    comebackkid79 Bobtail Member

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    0
    Aug 4, 2016
    0
    Changed that, replaced TPV, same problem..
     
    comebackkid79, Aug 6, 2016
    comebackkid79, Aug 6, 2016
    #9
  12. Aug 6, 2016 #10
    comebackkid79

    comebackkid79 Bobtail Member

    6
    0
    Aug 4, 2016
    0
    Replaced the valve behind the dash, replaced the TP valve as that seems to be what everyone is leaning towards, same problem... I'm starting to think something blew back into the system and is clogging the supply somewhere if that makes any sense
     
    comebackkid79, Aug 6, 2016
    comebackkid79, Aug 6, 2016
    #10
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