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Air spewing at brake knob

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by wjhuskey, Oct 17, 2019.

Page 1 of 2
  1. Oct 17, 2019 #1
    wjhuskey

    wjhuskey Bobtail Member

    25
    10
    Nov 1, 2014
    Arkansas
    0
    I have a Peterbilt 379 with air leaking around the brake knob area. Only does it if the yellow knob is pushed in. Haven't heard any air spewing from outside. Anyone know if it's an urgent fix? Thanks in advance.
     
    wjhuskey, Oct 17, 2019
    wjhuskey, Oct 17, 2019
    #1
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  3. Oct 17, 2019 #2
    mitrucker

    mitrucker Road Train Member

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    Lapeer, MI
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    mitrucker, Oct 17, 2019
    mitrucker, Oct 17, 2019
    #2
  4. Oct 17, 2019 #3
    goforce

    goforce Light Load Member

    168
    76
    Apr 12, 2007
    South, Ga
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    Replace the park valves.
     
    goforce, Oct 17, 2019
    goforce, Oct 17, 2019
    #3
    Tb0n3 and wjhuskey Thank this.
  5. Oct 17, 2019 #4
    OldeSkool

    OldeSkool Road Train Member

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    Yes the valve is probably leaking and I would replace it ASAP. I was stranded at a truck stop once because it blew out on me. Couldn't build up enough air to drive anywhere.
     
    OldeSkool, Oct 17, 2019
    OldeSkool, Oct 17, 2019
    #4
    wjhuskey Thanks this.
  7. Oct 17, 2019 #5
    OldeSkool

    OldeSkool Road Train Member

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    And just FYI I tried JB Weld and everything I could think of to fix it and nothing worked. I just wanted to get somewhere that had the part I needed.
     
    OldeSkool, Oct 17, 2019
    OldeSkool, Oct 17, 2019
    #5
    wjhuskey Thanks this.
  8. Oct 17, 2019 #6
    wjhuskey

    wjhuskey Bobtail Member

    25
    10
    Nov 1, 2014
    Arkansas
    0
    Thanks for the advice. I had a feeling it wasn't a good idea to keep driving it for long. Sure enough, I made it back to the field where we are harvesting and parked, then the truck wouldn't move and low air pressure light came on the dash. It will only stay at 50 psi. Thank God I made it back safely.
     
    wjhuskey, Oct 17, 2019
    wjhuskey, Oct 17, 2019
    #6
    OldeSkool Thanks this.
  9. Oct 17, 2019 #7
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    Rotate the knob clockwise, if the leak changes or goes away with rotation I agree replace the MV3.

    However, if the leak is coming from the back of the valve or passing through the valve there is a separate issue such as brake chamber bypassing or other leak somewhere.
     
    Goodysnap, Oct 17, 2019
    Goodysnap, Oct 17, 2019
    #7
    magoo68, wjhuskey and starmac Thank this.
  10. Oct 17, 2019 #8
    truckdriver31

    truckdriver31 Road Train Member

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    do you have the airlines backwards
     
    truckdriver31, Oct 17, 2019
    truckdriver31, Oct 17, 2019
    #8
    wjhuskey Thanks this.
  11. Oct 18, 2019 #9
    x1Heavy

    x1Heavy Road Train Member

    34,017
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    White County, Arkansas
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    That would be considered a DOT item. Don't move that truck until you have found the core leak and resolved it properly.
     
    x1Heavy, Oct 18, 2019
    x1Heavy, Oct 18, 2019
    #9
    wjhuskey and truckdriver31 Thank this.
  12. Oct 22, 2019 #10
    wjhuskey

    wjhuskey Bobtail Member

    25
    10
    Nov 1, 2014
    Arkansas
    0
    Not that I know of. My full time mechanic is very experienced and knowledgeable. He looked at it later and has it temporarily fixed til he gets more time to replace a brake chamber.
     
    wjhuskey, Oct 22, 2019
    wjhuskey, Oct 22, 2019
    #10
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