Cab leveling valve dumps air when I turn of my truck.

Discussion in 'Ask An Owner Operator' started by Ikamob01, Feb 2, 2023.

  1. Ikamob01

    Ikamob01 Medium Load Member

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    Cab leveling valve dumps air when I turn of my truck. Is it a bad leveling valve? First I thought it was the cab airbag or shocks. I replace them but issue persist. Sometimes when I get of my truck I will hear a little bite hissing sound.
    Any help will do it.
     
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  3. Lazer

    Lazer Road Train Member

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    What model truck? Does this happen immediately after turn the key?
     
  4. Ikamob01

    Ikamob01 Medium Load Member

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    International prostar. It happens overnight. When I wake up the leveling valve will be all the way down with deflated bags.
     
  5. AModelCat

    AModelCat Road Train Member

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    What's your air pressure at after its sat overnight? If the tanks are empty or very low then its leaking out somewhere on the truck.
     
  6. Ikamob01

    Ikamob01 Medium Load Member

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  7. AModelCat

    AModelCat Road Train Member

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    You've got an air leak somewhere on the truck. All trucks I've seen have a pressure protection valve and once reservoir pressure drops below somewhere around 75 PSI or so, it no longer allows air to flow to accessories like suspension, cab, seat etc.
     
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  8. Long FLD

    Long FLD Road Train Member

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    Take a spray bottle of soapy water and get under your truck. Unless you can already confirm the leak is at the cab bags or leveling valve. Even if your air is leaking someplace else your cab will be dumped when your tanks are empty.
     
  9. AModelCat

    AModelCat Road Train Member

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    I'm thinking he might find 2 leaks. If it was just from the cab suspension then the air reservoirs would maintain pressure once the pressure protection valve closed off.
     
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  10. Ikamob01

    Ikamob01 Medium Load Member

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    When I turn of the truck I hear a little bit leaks from the valve. Sometimes when I get out the truck it beeps air..
     
  11. Long FLD

    Long FLD Road Train Member

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    If you hear a small bit of air when you get out and then it stops that’s just the cab leveling itself because you removed your weight from the cab.
     
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