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Air leaking when cold

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Ciufero, Jan 31, 2019.

  1. Jan 31, 2019 #1
    Ciufero

    Ciufero Bobtail Member

    19
    2
    Dec 29, 2018
    0
    Air is leaking when cold ( around 15 min after start up), when its warmed up everything seems normal. Anything to look for?
     
    Ciufero, Jan 31, 2019
    Ciufero, Jan 31, 2019
    #1
    Rideandrepair Thanks this.
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  3. Jan 31, 2019 #2
    Cattleman84

    Cattleman84 Road Train Member

    10,002
    71,350
    Nov 1, 2017
    The Sticks, Idaho
    0
    Frozen pressure relief valve?
     
    Cattleman84, Jan 31, 2019
    Cattleman84, Jan 31, 2019
    #2
    Rideandrepair Thanks this.
  4. Jan 31, 2019 #3
    Rideandrepair

    Rideandrepair Road Train Member

    17,451
    56,621
    Aug 8, 2015
    0
    I’ve had that happen a few times. Leaks show up when it’s cold outside. Usually a pinhole in pancake on brake chamber. Soon to fail fully.
     
    Rideandrepair, Jan 31, 2019
    Rideandrepair, Jan 31, 2019
    #3
  5. Jan 31, 2019 #4
    Cattleman84

    Cattleman84 Road Train Member

    10,002
    71,350
    Nov 1, 2017
    The Sticks, Idaho
    0
    Not fun... Had that happen last week.
     
    Cattleman84, Jan 31, 2019
    Cattleman84, Jan 31, 2019
    #4
    InTooDeep and Rideandrepair Thank this.
  7. Feb 1, 2019 #5
    BoxCarKidd

    BoxCarKidd Road Train Member

    4,525
    6,586
    Aug 26, 2014
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    Feel for air blowing out the bottom of the dryer. Next test the governor.
     
    BoxCarKidd, Feb 1, 2019
    BoxCarKidd, Feb 1, 2019
    #5
    Wannabe tech and Rideandrepair Thank this.
  8. Mar 16, 2019 #6
    Ciufero

    Ciufero Bobtail Member

    19
    2
    Dec 29, 2018
    0
    it was johnson bar valve (behind the dash) leaking when cold
     
    Ciufero, Mar 16, 2019
    Ciufero, Mar 16, 2019
    #6
  9. Mar 16, 2019 #7
    ichudov

    ichudov Heavy Load Member

    742
    642
    Mar 14, 2012
    Berkeley, IL
    0
    Invite a young person who can actually hear and have him or her help you find where it is leaking from.

    This is what I do.
     
    ichudov, Mar 16, 2019
    ichudov, Mar 16, 2019
    #7
    BoxCarKidd Thanks this.
  10. Mar 25, 2019 #8
    BigRedSA

    BigRedSA Bobtail Member

    15
    13
    Mar 24, 2019
    USA
    0
    Had to call roadside for a driver who froze his brakes up in the mountains, roadside guy put coolant in the trailer airline by funnel and pumped rhe trailer valve a good bit and it did the trick
     
    BigRedSA, Mar 25, 2019
    BigRedSA, Mar 25, 2019
    #8
  11. Mar 27, 2019 #9
    JohnC123

    JohnC123 Light Load Member

    135
    66
    Jan 25, 2018
    0
    Just a thought, secondary tank, old air bags (dry-rotted areas until rolled out full).
     
    JohnC123, Mar 27, 2019
    JohnC123, Mar 27, 2019
    #9
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