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Truck not building air

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

  1. Oct 21, 2021 #1
    Isxrookie

    Isxrookie Light Load Member

    82
    45
    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.
     
    Isxrookie, Oct 21, 2021
    Isxrookie, Oct 21, 2021
    #1
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  3. Oct 21, 2021 #2
    ibcalm19

    ibcalm19 Road Train Member

    1,439
    2,398
    Nov 30, 2015
    Pennsylvania
    0
    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.
     
    ibcalm19, Oct 21, 2021
    ibcalm19, Oct 21, 2021
    #2
  4. Oct 22, 2021 #3
    Omar2018

    Omar2018 Bobtail Member

    13
    7
    Nov 23, 2017
    0
    Maybe it’s the purge valve on the back of your air compressor.
     
    Omar2018, Oct 22, 2021
    Omar2018, Oct 22, 2021
    #3
  5. Oct 22, 2021 #4
    062

    062 Road Train Member

    5,849
    31,702
    Oct 20, 2013
    0
    Have you drained the tanks? It’s possible that they are full of water leaving no room for air.
     
    062, Oct 22, 2021
    062, Oct 22, 2021
    #4
    LoneRanger Thanks this.
  7. Oct 25, 2021 #5
    Isxrookie

    Isxrookie Light Load Member

    82
    45
    Jan 24, 2011
    New Orleans, la
    0
    I found the culprit. This is under the fifth wheel
     

    Attached Files:

    Isxrookie, Oct 25, 2021
    Isxrookie, Oct 25, 2021
    #5
    Vampire Thanks this.
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