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Air problems 2001 peterbilt 379

Discussion in 'Peterbilt Forum' started by Jempy, Apr 5, 2017.

  1. Apr 5, 2017 #1
    Jempy

    Jempy Bobtail Member

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    Apr 5, 2017
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    so I got air leaking out the exhaust port on the fire wall when pushing on the brakes. I changed out the dash valve,treadle valve and also checked all my brake cans to make sure all the diaphragms were good by taking of the air lines and plugging them one by one. Anyone have advice on where to go from here. Also if u pull the johnny bar down it blows air out the exhaust port on the treadle valve.
     
    Jempy, Apr 5, 2017
    Jempy, Apr 5, 2017
    #1
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  3. Apr 5, 2017 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    You are moving right along there! Yes I have done that sort of thing also. Try to find the problem first and then replace that part. I would look toward something like the tractor protection valve, I saw that on a White GMC without a trailer hooked up. Check to see if it is back feeding through the hand valve. I then traced it to the valve in front of the coiled trailer air lines. Let us know what you find and or ask more questions.
     
    BoxCarKidd, Apr 5, 2017
    BoxCarKidd, Apr 5, 2017
    #2
  4. Apr 9, 2017 #3
    Rat

    Rat Road Train Member

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    Rat, Apr 9, 2017
    Rat, Apr 9, 2017
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