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losing air pressure question

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Allan Decker, Mar 23, 2014.

  1. Mar 23, 2014 #1
    Allan Decker

    Allan Decker Bobtail Member

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    Nov 19, 2009
    montz, la
    0
    05 c15 cat bxs, after air pressure build up and the air purge I and feel air coming from where it purges. Is it leaking back from compressor? These things always confused me.
     
    Allan Decker, Mar 23, 2014
    Allan Decker, Mar 23, 2014
    #1
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  3. Mar 23, 2014 #2
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    It will purge air for about 20-30 seconds, this is part of the normal purge process. Does it leak continuously though?
     
    Heavyd, Mar 23, 2014
    Heavyd, Mar 23, 2014
    #2
  4. Mar 23, 2014 #3
    Allan Decker

    Allan Decker Bobtail Member

    43
    21
    Nov 19, 2009
    montz, la
    0
    Yes, and if it sits over night I lose most of my air pressure, and when I start truck it's ticks and I have to reach under and push the valve up to stop it so it will build pressure. And after a couple cycles it works properly. But when it hit 120 it's purges, and I still feel air coming out as air pressure drops
     
    Allan Decker, Mar 23, 2014
    Allan Decker, Mar 23, 2014
    #3
  5. Mar 23, 2014 #4
    Pablo-UA

    Pablo-UA Road Train Member

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    Borispol, Ukraine
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    seems to me air driyer goes bad. it must purge for some seconds.
     
    Pablo-UA, Mar 23, 2014
    Pablo-UA, Mar 23, 2014
    #4
  7. Mar 23, 2014 #5
    rank

    rank Road Train Member

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    50 miles north of Rochester, NY
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    Is it leaking from a round rubber diaphragm about the size of a quarter?
     
    rank, Mar 23, 2014
    rank, Mar 23, 2014
    #5
  8. Mar 23, 2014 #6
    Allan Decker

    Allan Decker Bobtail Member

    43
    21
    Nov 19, 2009
    montz, la
    0
    Yes it's leaking from the round diaphragm. Not purging just can feel air constantly coming from it.

    And after sitting over night, when it's below 90lbs, I have to push that round diaphragm up so it stops dropping air and builds up to 120
     
    Allan Decker, Mar 23, 2014
    Allan Decker, Mar 23, 2014
    #6
  9. Mar 23, 2014 #7
    chalupa

    chalupa Road Train Member

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    Houston,Texas
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    Replace or rebuild the drier.....
     
    chalupa, Mar 23, 2014
    chalupa, Mar 23, 2014
    #7
  10. Mar 23, 2014 #8
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    You do not need to rebuild the Air Dryer, depending on what brand Dryer you have, it has a Turbo Boost Valve or a Purge Valve, some have both. All you need to do is buy the Rebuild Kit for whichever Valve is bad, it's about $45-$50 dollars. All you need a is pair of Snap Ring Pliers and 15 minutes and you can do it yourself. If you look under the Air Dryer you can see the Snap Ring holding the Valve in place. The Instructions come with the Rebuild Kit.
     
    Last edited: Mar 23, 2014
    boneebone, Mar 23, 2014
    boneebone, Mar 23, 2014
    #8
    Allan Decker Thanks this.
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