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Lost air pressure while trying to move Parking spots

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Dadetrucking305, Aug 9, 2021.

  1. Aug 9, 2021 #1
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    I’m at a truck stop loaded and went to love the truck across the lot to another spot and lost pressure right away so I got a water bottle and put sop in it and made little holes on the top.Sprayed around lines and didn’t find anything.Turned off the truck and tried to hear a leak but didn’t find anything.What can it be? Air compressor was changed 3 months ago.
     
    Dadetrucking305, Aug 9, 2021
    Dadetrucking305, Aug 9, 2021
    #1
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  3. Aug 9, 2021 #2
    tarmadilo

    tarmadilo Road Train Member

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    I had a similar problem, turned out to be a sticking pressure relief valve on the air dryer.
     
    tarmadilo, Aug 9, 2021
    tarmadilo, Aug 9, 2021
    #2
    Dadetrucking305 Thanks this.
  4. Aug 9, 2021 #3
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Sep 15, 2011
    Cibolo,Texas
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    I checked the outlet on the air compressor and I can keep my hand over it without any resistance.
     
    Dadetrucking305, Aug 9, 2021
    Dadetrucking305, Aug 9, 2021
    #3
  5. Aug 9, 2021 #4
    RigJockey

    RigJockey Bobtail Member

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    Aug 9, 2021
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    Could be unloader valve, typically on top of compressor. It controls whether the compressor is sending air to the drier/tanks or "cycling" the air in the compressor head. Could also be a bad governor or governor signal line.

    Assuming you've outright lost air pressure and not just when you hit the brakes.
     
    RigJockey, Aug 9, 2021
    RigJockey, Aug 9, 2021
    #4
  7. Aug 10, 2021 #5
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Sep 15, 2011
    Cibolo,Texas
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    I lost air pressure as soon as I disengaged the brakes.I replaced the compressor and governor in April.Replaced the compressor again today and all seems good.
     
    Last edited: Aug 10, 2021
    Dadetrucking305, Aug 10, 2021
    Dadetrucking305, Aug 10, 2021
    #5
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