Invisible air leak

Discussion in 'Trucks [ Eighteen Wheelers ]' started by chopov78, Apr 1, 2016.

  1. chopov78

    chopov78 Light Load Member

    122
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    Feb 27, 2010
    illinois
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    Need help with air leak.
    I have Volvo 2007yr wit hyundai trailer 2004.Right now trying to find air leak from somewere but can not hear nothing,checked the air lines and air bags,everything looks fine.
    So,when stoped and engine shut 990 of the time the air dissapears in 5 to 10 minutes.
    Nobody can find it,and can not pass tha annual dot inspection.Any idea?Thanks!
     
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  3. otherhalftw

    otherhalftw R.I.P.

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    Is the leak in the trailer or the tractor?
     
  4. Jerry12

    Jerry12 Heavy Load Member

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    check the air lines going into the air regulator filter. (while ur there, clean out the metal filter)
     
  5. chopov78

    chopov78 Light Load Member

    122
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    Feb 27, 2010
    illinois
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    can not hear it
     
  6. GrapeApe

    GrapeApe Road Train Member

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    I find it very hard to believe that you lose all you air in 5-10 min and no one can hear anything. You should be able to find a leak that bad with a pin wheel, or when you hat blows off, you're close.
     
  7. chopov78

    chopov78 Light Load Member

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    Feb 27, 2010
    illinois
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    do you mean air dryer?
     
  8. otherhalftw

    otherhalftw R.I.P.

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    Let me rephrase the question....
    Is the trailer getting air but not holding it? or Is the trailer not getting any air at all?
     
  9. otherhalftw

    otherhalftw R.I.P.

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    That is why I'm asking if the trailer is getting any air at all.
     
  10. Jerry12

    Jerry12 Heavy Load Member

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    No. Auto shift tranny will have one to regulate the amount of air pressure going into the transmission. There will be another air regulator before hitting the brake chambers.
     
    otherhalftw Thanks this.
  11. chopov78

    chopov78 Light Load Member

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    Feb 27, 2010
    illinois
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    bouth getting air and not holding it.
     
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