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ABS valve leaking air

Discussion in 'Peterbilt Forum' started by Loaderlou, Feb 22, 2019.

Page 1 of 2
  1. Feb 22, 2019 #1
    Loaderlou

    Loaderlou Medium Load Member

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    Feb 24, 2014
    0
    Hi everyone. My ABS valve is leaking air to the point when I turn the truck off with the air brake button in the release mode, the pressure drops from say 100 #’s (not hashtag, pounds) to 30 in a matter of 10 to 15 seconds. It’s not the modulator valves it’s the ABS valve itself. I just changed the whole group out 7 months ago and I also changed out the quick release valve. I’ve been told if one leaks change the other and visa versa. How about a bad air can? All opinions appreciated, thanks
     
    Loaderlou, Feb 22, 2019
    Loaderlou, Feb 22, 2019
    #1
    Another Canadian driver Thanks this.
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  3. Feb 22, 2019 #2
    swaan

    swaan Road Train Member

    2,942
    4,374
    Jul 12, 2009
    BC canada
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    Yes it's a maxi pot with a bad diaphragm. Its bleeding back into the service side and going out your abs valve. This is why it only leaks with yellow dash button pushed in. It's rare but does happen. I just changed one 2 weeks ago.
    If you want to make sure just put a vise grip on the line going to your maxi pot and see if it stops
     
    swaan, Feb 22, 2019
    swaan, Feb 22, 2019
    #2
    Abruner454, Cegrier, Another Canadian driver and 3 others Thank this.
  4. Feb 22, 2019 #3
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,801
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    Jun 14, 2009
    romulus,mi
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    Exactly what Swaan said. Follow that procedure and you will find your problem. You might be lucky and only have 2 30/30 chambers in back instead of 4. Cut down on diagnostic time.
     
    QUALITYTRUCK, Feb 22, 2019
    QUALITYTRUCK, Feb 22, 2019
    #3
    Another Canadian driver Thanks this.
  5. Feb 23, 2019 #4
    Loaderlou

    Loaderlou Medium Load Member

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    Feb 24, 2014
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    Thank you guys for the comeback. I will try that today. I also need to change my compressor as it is starting to bleed oil. Full day of work ahead of me. Thanks again I’ll let you know how I make out
     
    Loaderlou, Feb 23, 2019
    Loaderlou, Feb 23, 2019
    #4
    Another Canadian driver Thanks this.
  7. Feb 23, 2019 #5
    Loaderlou

    Loaderlou Medium Load Member

    342
    130
    Feb 24, 2014
    0
    Just pinched off the service lines one by one and when I pinched off the front driver side the leak stopped. When I released the visegrip it sounded as if I took my foot off the brakes and no more leak.
     
    Loaderlou, Feb 23, 2019
    Loaderlou, Feb 23, 2019
    #5
    Another Canadian driver, swaan and uncleal13 Thank this.
  8. Feb 23, 2019 #6
    swaan

    swaan Road Train Member

    2,942
    4,374
    Jul 12, 2009
    BC canada
    0
    Your yellow button probably popped at same time. Sounds like you found it.

    What I usually do is if all 4 your pots are same age , replace them all. I cant seem to get more 4-5 years out them.
     
    swaan, Feb 23, 2019
    swaan, Feb 23, 2019
    #6
    Another Canadian driver and spsauerland Thank this.
  9. Feb 24, 2019 #7
    Loaderlou

    Loaderlou Medium Load Member

    342
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    Feb 24, 2014
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    I think you’re right. And yes I agree about the longevity of the chambers. On my list as well as maybe having to change some or all of the air valves due to the oil from my compressor. It never ends. Thanks for the help
     
    Loaderlou, Feb 24, 2019
    Loaderlou, Feb 24, 2019
    #7
    Another Canadian driver and swaan Thank this.
  10. Jun 3, 2019 #9
    LostSouls001

    LostSouls001 Bobtail Member

    2
    2
    Jun 3, 2019
    0
    Having this problem now on my Y2K W9, just read all your comments going to pinch some air lines now. Be right back..
     
    LostSouls001, Jun 3, 2019
    LostSouls001, Jun 3, 2019
    #9
    Another Canadian driver Thanks this.
  11. Jun 3, 2019 #10
    LostSouls001

    LostSouls001 Bobtail Member

    2
    2
    Jun 3, 2019
    0
    OK, when I pinched off the right parking brake on rear drive it stopped leaking from ABS valve, so I will change out the chamber tomorrow. Will report results..
    Thank you..
     
    LostSouls001, Jun 3, 2019
    LostSouls001, Jun 3, 2019
    #10
    Another Canadian driver Thanks this.
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