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Air leak right below the fifth wheel

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by KostaN, Mar 30, 2021.

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  1. Mar 30, 2021 #1
    KostaN

    KostaN Light Load Member

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    34225A6B-F28E-4F99-A5EB-4A752E9892E1.jpeg I have an air leak under this part on the circle rubber part
    Anyone know the part and if it’s repairable or need to be replaced?
    Cascadia 2011
     

    Attached Files:

    KostaN, Mar 30, 2021
    KostaN, Mar 30, 2021
    #1
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  3. Mar 30, 2021 #2
    Goodysnap

    Goodysnap Road Train Member

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    Get this professionally diagnosed.

    The air leak in question may not require repair or replacment of the exact component where the air is leaking.
     
    Goodysnap, Mar 30, 2021
    Goodysnap, Mar 30, 2021
    #2
    p608, AModelCat, Bean Jr. and 1 other person Thank this.
  4. Mar 30, 2021 #3
    bad-luck

    bad-luck Road Train Member

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    I believe that is the brain to the ABS system and is not serviceable.
     
    bad-luck, Mar 30, 2021
    bad-luck, Mar 30, 2021
    #3
    KostaN and Bean Jr. Thank this.
  5. Mar 30, 2021 #4
    KostaN

    KostaN Light Load Member

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    Yeah it seems that you were right buddy
    I did find a video it is the abs valve
    Thank you tho
     
    KostaN, Mar 30, 2021
    KostaN, Mar 30, 2021
    #4
  7. Mar 31, 2021 #5
    bad-luck

    bad-luck Road Train Member

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    Your welcome
     
    bad-luck, Mar 31, 2021
    bad-luck, Mar 31, 2021
    #5
  8. Mar 31, 2021 #6
    Inderjit

    Inderjit Heavy Load Member

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    When does it leak? When the brakes are applied of when the park brake is released?
    A leak between the maxi chamber and the service chamber will leak out the exhaust on the relay valve when the park brake is released.
     
    Inderjit, Mar 31, 2021
    Inderjit, Mar 31, 2021
    #6
    kwcam, AModelCat and KostaN Thank this.
  9. Mar 31, 2021 #7
    KostaN

    KostaN Light Load Member

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    All the time as long as it has air.
     
    KostaN, Mar 31, 2021
    KostaN, Mar 31, 2021
    #7
  10. Mar 31, 2021 #8
    Inderjit

    Inderjit Heavy Load Member

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    Sounds like the relay valve is the culprit. The two valves on either side of it are ABS modulator valves. It looks like its one valve so it might be pricey.
     
    Inderjit, Mar 31, 2021
    Inderjit, Mar 31, 2021
    #8
    KostaN Thanks this.
  11. Mar 31, 2021 #9
    AModelCat

    AModelCat Road Train Member

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    The joys of air system diagnosis. Many times the leaking valve isn't actually the culprit.
     
    AModelCat, Mar 31, 2021
    AModelCat, Mar 31, 2021
    #9
    KostaN Thanks this.
  12. Mar 31, 2021 #10
    KostaN

    KostaN Light Load Member

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    Most likely,I’ve heard around 170 just the muddle valve
     
    KostaN, Mar 31, 2021
    KostaN, Mar 31, 2021
    #10
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