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Air bag over-inflation

Discussion in 'Peterbilt Forum' started by Money-Mike, Nov 19, 2020.

Page 2 of 2
  1. Nov 19, 2020 #11
    Roger McG

    Roger McG Light Load Member

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    Oct 22, 2016
    western mass
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    Change the dump valve or exhaust valve mounted on same bracket as leveling valve facing back of truck. air is fed to leveling valve thru this valve.
     
    Roger McG, Nov 19, 2020
    Roger McG, Nov 19, 2020
    #11
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  3. Nov 19, 2020 #12
    Roger McG

    Roger McG Light Load Member

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    Oct 22, 2016
    western mass
    0
    20201119_184456.jpg This is the valve Im speaking of this is on my 93 same as my 94
    20201119_184456.jpg
     
    Roger McG, Nov 19, 2020
    Roger McG, Nov 19, 2020
    #12
  4. Nov 19, 2020 #13
    Roger McG

    Roger McG Light Load Member

    165
    198
    Oct 22, 2016
    western mass
    0
    Small round valve lower left corner
     
    Roger McG, Nov 19, 2020
    Roger McG, Nov 19, 2020
    #13
  5. Nov 19, 2020 #14
    Roger McG

    Roger McG Light Load Member

    165
    198
    Oct 22, 2016
    western mass
    0
    Although my 91 has almost like an old style tractor protection valve on the driver side frame rail right in front of the front drive
     
    Roger McG, Nov 19, 2020
    Roger McG, Nov 19, 2020
    #14
  7. Nov 19, 2020 #15
    Money-Mike

    Money-Mike Light Load Member

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    Sep 27, 2017
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    20201119_141836.jpg
     
    Money-Mike, Nov 19, 2020
    Money-Mike, Nov 19, 2020
    #15
  8. Nov 19, 2020 #16
    Money-Mike

    Money-Mike Light Load Member

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    Sep 27, 2017
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    So that's what I'm working with.

    Pic is of bags deflated, the arm is slanting up to the right. If I inflate it goes to dead straight across and cuts off like it's supposed to. After I drove for a little while, it slants down to the right, continuously exhausts from the clear hose but the bags never deflate down to level.
     
    Money-Mike, Nov 19, 2020
    Money-Mike, Nov 19, 2020
    #16
  9. Nov 19, 2020 #17
    Money-Mike

    Money-Mike Light Load Member

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    Sep 27, 2017
    0
    We have also replaced the distribution valve thats up near the front drives and catwalk, no change
     
    Money-Mike, Nov 19, 2020
    Money-Mike, Nov 19, 2020
    #17
  10. Nov 19, 2020 #18
    Roger McG

    Roger McG Light Load Member

    165
    198
    Oct 22, 2016
    western mass
    0
    Look inside frame rail just in front of your front rear for a valve mounted on a step out bracket
     
    Roger McG, Nov 19, 2020
    Roger McG, Nov 19, 2020
    #18
  11. Nov 19, 2020 #19
    Money-Mike

    Money-Mike Light Load Member

    97
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    Sep 27, 2017
    0
    I'm at home now. I've got to run a load of scrap concrete in the morning, so I'll look for that valve as well.
     
    Money-Mike, Nov 19, 2020
    Money-Mike, Nov 19, 2020
    #19
  12. Mar 1, 2022 #20
    Pete389562

    Pete389562 Bobtail Member

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    Feb 6, 2021
    0
    Was this fixed? I'm having the same problem on my 579
     
    Pete389562, Mar 1, 2022
    Pete389562, Mar 1, 2022
    #20
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