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2000 ABS Brake valve blowing air when releasing parking brake

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by greaseburner, Mar 29, 2019.

  1. Mar 29, 2019 #1
    greaseburner

    greaseburner Light Load Member

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    Was working fine when we had to replace a brake line on the passenger side front drive. Since then we have air blowing out of the drivers side abs brake valve that attaches to the center port when releasing the parking brake. We put a new drivers side piece on, still blows. Truck was not running when we did this test, as had air hooked up to it if that matters.

    Thanks
     
    greaseburner, Mar 29, 2019
    greaseburner, Mar 29, 2019
    #1
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  3. Mar 29, 2019 #3
    greaseburner

    greaseburner Light Load Member

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    We just replaced the center section of the abs valve assembly. Still blows air out the drivers side and now blows air out of the center section as well.

    It's on a 2000 379 Pete if that helps any.
     
    greaseburner, Mar 29, 2019
    greaseburner, Mar 29, 2019
    #3
  4. Mar 29, 2019 #3
    Goodysnap

    Goodysnap Road Train Member

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    Make sure you didnt get the brake hoses crossed. Service port on the chamber closest the the slack goes to the ABS modulator valve. Emergency line closest to the caging hole goes to the emergency valve and will be the smaller of the two hoses.

    If plumbing is correct, pull the service lines off at the chambers and release the park brake, if air comes out of the service port of the chamber, you have a chamber leaking internally.
     
    Goodysnap, Mar 29, 2019
    Goodysnap, Mar 29, 2019
    #3
    spsauerland, Working2party and Heavyd Thank this.
  5. Mar 29, 2019 #4
    Heavyd

    Heavyd Road Train Member

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    Yep, air lines crossed at your brake chamber, or maxi leaking through internally.
     
    Heavyd, Mar 29, 2019
    Heavyd, Mar 29, 2019
    #4
    spsauerland, Working2party and Goodysnap Thank this.
  7. Mar 29, 2019 #5
    greaseburner

    greaseburner Light Load Member

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    Sep 13, 2013
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    Bingo. Thanks

    Brake chamber
     
    greaseburner, Mar 29, 2019
    greaseburner, Mar 29, 2019
    #5
    Heavyd and Working2party Thank this.
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