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Air Leak when I apply foot brake pedal

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Brooker, Oct 8, 2018.

  1. Oct 8, 2018 #1
    Brooker

    Brooker Bobtail Member

    15
    3
    Apr 7, 2018
    Nova Scotia
    0
    When I apply foot brake pedal air is escaping through the exhaust port on the firewall of my 96 KW. This occurs only when the park brakes are applied. I have changed out the dash park valve, still same problem. Is there another air valve the likely culprit?
     
    Brooker, Oct 8, 2018
    Brooker, Oct 8, 2018
    #1
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  3. Oct 8, 2018 #2
    truckdriver31

    truckdriver31 Road Train Member

    6,998
    8,360
    Sep 18, 2013
    0
    did you hook up air lines on trailer backwards. also have you checked your trailer. also i never hit the pedal with nobs out.
     
    truckdriver31, Oct 8, 2018
    truckdriver31, Oct 8, 2018
    #2
  4. Oct 8, 2018 #3
    boneebone

    boneebone Road Train Member

    2,297
    2,371
    Mar 13, 2009
    0
    It could be the foot brake valve in the engine compartment that is mounted on the firewall is bad.
     
    boneebone, Oct 8, 2018
    boneebone, Oct 8, 2018
    #3
  5. Oct 8, 2018 #4
    Brooker

    Brooker Bobtail Member

    15
    3
    Apr 7, 2018
    Nova Scotia
    0
    No air lines hooked up right. Jacked up front end to apply front brakes to check king pins etc when I noticed this.
     
    Brooker, Oct 8, 2018
    Brooker, Oct 8, 2018
    #4
  7. Oct 8, 2018 #5
    Brooker

    Brooker Bobtail Member

    15
    3
    Apr 7, 2018
    Nova Scotia
    0
    Yes it may be but a nasty place to get at. Wondering if there is anyway to check it out first?
     
    Brooker, Oct 8, 2018
    Brooker, Oct 8, 2018
    #5
  8. Aug 13, 2020 #6
    Jungle Jim

    Jungle Jim Bobtail Member

    6
    0
    Jun 13, 2018
    0
    Did you ever figure out the problem?
     
    Jungle Jim, Aug 13, 2020
    Jungle Jim, Aug 13, 2020
    #6
  9. Sep 17, 2020 #7
    drdesl

    drdesl Light Load Member

    218
    388
    Oct 7, 2015
    Billings, Montana
    0
    Had this happen a bunch on a 2000-2007 W900 fleet where I used to work. Problem was the QR1AC valve on the left framerail (inside) immediately behind the cab. Quick Release / Anti Compounding combination valve. I know this is an old thread, just figured i might be able to help someone sometime.
     
    drdesl, Sep 17, 2020
    drdesl, Sep 17, 2020
    #7
    jsnell and God prefers Diesels Thank this.
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