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Air pressure problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by trucker29, Apr 17, 2015.

  1. Apr 17, 2015 #1
    trucker29

    trucker29 Bobtail Member

    2
    0
    Feb 3, 2015
    0
    Hi I own a 2005 International Model 8600. When putting weight on the rear axles, such as pinning to a loaded trailer, my air pressure goes down. Takes a while for my air bags to fill again and the pressure to go to 120 psi. When rolling on a highway, my air pressure maximizes to 120 psi and will immediately descend to 90 psi. It will repeat then repeat this as long as I'm driving on a highway. Once I start city driving it will only go to about 90 psi.
     
    trucker29, Apr 17, 2015
    trucker29, Apr 17, 2015
    #1
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  3. Apr 17, 2015 #2
    The Admiral

    The Admiral Heavy Load Member

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    Jul 18, 2010
    Akron,Ohio
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    Check the leveling valve and the air bags. If you shut the truck off I would think you could hear a leak like that. On the air bags I would spray them down with some windex. If they are leaking you will see bubbles. A leak the size of what you are describing should be easy to find.
     
    The Admiral, Apr 17, 2015
    The Admiral, Apr 17, 2015
    #2
  4. Apr 17, 2015 #3
    trucker29

    trucker29 Bobtail Member

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    Feb 3, 2015
    0
    Thanks. Will do.
     
    trucker29, Apr 17, 2015
    trucker29, Apr 17, 2015
    #3
  5. Apr 17, 2015 #4
    RSQ20

    RSQ20 Medium Load Member

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    Jul 11, 2013
    Upper Fraser Valley, BC Canada
    0
    We just had a leaker on the Peterbilt.. small enough to not hear it and only deflated on certain load lever.. Up inside the cone...

    ... Philip
     
    RSQ20, Apr 17, 2015
    RSQ20, Apr 17, 2015
    #4
  7. Apr 17, 2015 #5
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    Yep, sounds like a leaking air bag or line.
     
    Heavyd, Apr 17, 2015
    Heavyd, Apr 17, 2015
    #5
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