Truck not building air

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Isxrookie, Oct 21, 2021.

  1. Isxrookie

    Isxrookie Light Load Member

    62
    42
    Jan 24, 2011
    New Orleans, la
    0
    I was backing up and the truck air knobs randomly popped out. I checked the compressor, it’s pumping out air. I went through all the tanks to see if they were getting air. They are. The gauges are not moving but they did move when we hooked a air line to one of the tanks to move the truck. Airbags didn’t raise either. Truck doesn’t have a dryer.
     
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  3. ibcalm19

    ibcalm19 Road Train Member

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    Nov 30, 2015
    Pennsylvania
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    What truck do you have that doesn't dryer? There is a major leak if you lost air that quickly & your air bags are not inflating. You should be able to hear the air leak. If you trace the line coming from the airline compressor should lead you in the right direction.
     
  4. Omar2018

    Omar2018 Bobtail Member

    13
    7
    Nov 23, 2017
    0
    Maybe it’s the purge valve on the back of your air compressor.
     
  5. 062

    062 Road Train Member

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    9,752
    Oct 20, 2013
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    Have you drained the tanks? It’s possible that they are full of water leaving no room for air.
     
    LoneRanger Thanks this.
  6. Isxrookie

    Isxrookie Light Load Member

    62
    42
    Jan 24, 2011
    New Orleans, la
    0
    I found the culprit. This is under the fifth wheel
     

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    Vampire Thanks this.
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