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secondary air tank loses pressure

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ptwn1, Jul 31, 2013.

  1. Jul 31, 2013 #1
    ptwn1

    ptwn1 Light Load Member

    94
    11
    Oct 4, 2012
    0
    hello i have a problem with my secondary air tank. the pressure will build to like 75 psi when idling then when i release the parking brake the pressure will drop to 40 or 50 psi. the primary tank will still have normal pressure. when i drive on the freeway everthing is back to normal.
     
    ptwn1, Jul 31, 2013
    ptwn1, Jul 31, 2013
    #1
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  3. Jul 31, 2013 #2
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,640
    Oct 11, 2010
    Borispol, Ukraine
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    Is it volvo with ISX CM870?
     
    Pablo-UA, Jul 31, 2013
    Pablo-UA, Jul 31, 2013
    #2
  4. Jul 31, 2013 #3
    ptwn1

    ptwn1 Light Load Member

    94
    11
    Oct 4, 2012
    0
    2002 century det 12.7
     
    ptwn1, Jul 31, 2013
    ptwn1, Jul 31, 2013
    #3
  5. Jul 31, 2013 #4
    JohnP3

    JohnP3 Road Train Member

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    682
    Feb 21, 2010
    Rock Creek B.C. Canada
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    The first thing I would be checking is for air leaks. It is easier to find with shop air, connected to the system, chock the tires and release the brakes wet you hand and see if there is air from the relay between the axles, if there is a leak you need to remove the service brake lines from the brake pots and look for the leaker. Use a soapy solution, on every connection and tank. A multiple of little leaks can add up to a large leak.
    Just a thought!
     
    JohnP3, Jul 31, 2013
    JohnP3, Jul 31, 2013
    #4
    RocketScott Thanks this.
  7. Jul 31, 2013 #5
    Kansas

    Kansas Road Train Member

    2,541
    2,579
    Apr 14, 2009
    aircap, Ks.
    0
    If ur on the road, a bottle of water w/ a little bit of shampoo in it. works great for finding leaks.
     
    Kansas, Jul 31, 2013
    Kansas, Jul 31, 2013
    #5
  8. Aug 1, 2013 #6
    claytonr1973

    claytonr1973 Light Load Member

    266
    289
    Jun 1, 2008
    miami,ok
    0
    I always use one of those pump pesticide sprayers that you can get at walmart for $15. Fill it with water and add soap. Pump it up and you can spray for a long time. I also use one for brightener but you can leave in there very long as it will eat the seal.
     
    claytonr1973, Aug 1, 2013
    claytonr1973, Aug 1, 2013
    #6
  9. Aug 2, 2013 #7
    JohnP3

    JohnP3 Road Train Member

    1,594
    682
    Feb 21, 2010
    Rock Creek B.C. Canada
    0
    Many times you will find a lot of leaks when you are washing the truck, all you have to do is look.
     
    JohnP3, Aug 2, 2013
    JohnP3, Aug 2, 2013
    #7
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