Secondary air completely gone.

Discussion in 'Commercial Truck Forums' started by Yagbt, Jul 12, 2019.

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  1. Yagbt

    Yagbt Bobtail Member

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    Hi,
    I'm a 3 year driver just got my truck last year. After fueling at a flying J that has no garage my secondary air went completely to zero psi. Primary holds about
    78 psi. What could be causing this? Help.
    I noticed a small round black tank under my truck that has a filter on it and it spits out some air with a small amount of liquid with it fairly often could this need a new filter?
     
    Yagbt, Jul 12, 2019
    #1
  2. Ridgeline

    Ridgeline Road Train Member

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    Get it towed to a shop or call a mobile repair service.
     
    Ridgeline, Jul 12, 2019
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    Roberts450 Thanks this.
  3. Opendeckin

    Opendeckin Medium Load Member

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    How do you not know what an air dryer is after 3 years?
     
    Opendeckin, Jul 12, 2019
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    Roberts450 and buddyd157 Thank this.
  4. Yagbt

    Yagbt Bobtail Member

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    Do you have a suggestion?
     
    Yagbt, Jul 12, 2019
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  5. Midwest Trucker

    Midwest Trucker Road Train Member

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    What he said. I’d start with mobile repair. It’s likely something simple and you’ll save money and time.

    Let us know what you end up doing.
     
    Midwest Trucker, Jul 12, 2019
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  6. x1Heavy

    x1Heavy Road Train Member

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    Yer OOS then and there.

    Find a shop big enough to deal with your problem.

    I might have a few ideas from my own experience losing both Pri and Sec Air at the same time over dinner. (Air Compressor burned up...)
     
    x1Heavy, Jul 12, 2019
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  7. frito bandito

    frito bandito Light Load Member

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    What engine manufacturer? If it's a cummins it could simply be the unloader valve is stuck. Mine it doing me like that right now. It's fine on the highway and dry climates but gets persnickety when there's no boost being made. Cummins has a procedure to 'unstick' it and I need to do that again next time I'm home.

    If you notice it going down often while driving check the cabin air bags for holes.
     
    frito bandito, Jul 12, 2019
    #7
  8. Socal Xpress

    Socal Xpress Road Train Member

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    Guessing games are fun. It's a Volvo right!!! I know it's a Volvo!!
     
    Socal Xpress, Jul 12, 2019
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    Bean Jr., Opendeckin and frito bandito Thank this.
  9. buddyd157

    buddyd157 Road Train Member

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    now, you get 3 guesses as to the color of this alleged Volvo
     
    buddyd157, Jul 12, 2019
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    Bean Jr. Thanks this.
  10. Opendeckin

    Opendeckin Medium Load Member

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    I'm gonna go with white...

    Don't think I'm gonna need the other 2 guesses.
     
    Opendeckin, Jul 12, 2019
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    Cattleman84, magoo68, Midwest Trucker and 3 others Thank this.
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