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Peterbilt keeps breaking airbag studs

Discussion in 'Ask An Owner Operator' started by tamip, May 23, 2021.

Page 1 of 7
  1. May 23, 2021 #1
    tamip

    tamip Light Load Member

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    Oct 9, 2013
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    20210521_161156.jpg 20210521_234734.jpg 20210516_153024.jpg 20210502_181805.jpg 20210502_181654.jpg 20210521_161156.jpg 20210521_234734.jpg 20210516_153024.jpg 20210502_181805.jpg 20210502_181654.jpg 20210521_161156.jpg 20210521_234734.jpg 20210516_153024.jpg 20210502_181805.jpg 20210502_181654.jpg 20210521_161156.jpg 20210521_234734.jpg 20210516_153024.jpg 20210502_181805.jpg 20210502_181654.jpg 20210521_161156.jpg I have a 2011 peterbilt 386 with the low leaf suspension. The problem I keep having is for some unknown reason the rear air bag studs keep breaking. I've already replaced 4 airbags so this needs to be fixed. After the first stud broke we assumed the stud was damaged and put another bag on. Well after the 2nd air bag broke I made an appointment to get my leaf spring bushings done. They were pretty bad. The torque rods on top were replaced before the air bag issues started. The shop did a 3 axle alignment when they did the bushings. These bags typically last maybe a week or two tops before they break again. Anyone have this problem before? Please help.
     
    tamip, May 23, 2021
    tamip, May 23, 2021
    #1
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  3. May 23, 2021 #2
    AModelCat

    AModelCat Road Train Member

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    Doesn't look like its breaking to me. Looks like its bending. Going on a limb and going to guess loose u-bolts or broken center bolt in the spring pack. That spring has got to be walking back and forth or it is severely misaligned.
     
    AModelCat, May 23, 2021
    AModelCat, May 23, 2021
    #2
    mitmaks, lester, 77fib77 and 4 others Thank this.
  4. May 23, 2021 #3
    tamip

    tamip Light Load Member

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    Never said bending I said it keeps breaking the studs.
     
    tamip, May 23, 2021
    tamip, May 23, 2021
    #3
  5. May 23, 2021 #4
    tamip

    tamip Light Load Member

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    The leaf spring bushings were just done. All new u bolts and such
     
    tamip, May 23, 2021
    tamip, May 23, 2021
    #4
    slow.rider Thanks this.
  7. May 23, 2021 #5
    AModelCat

    AModelCat Road Train Member

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    I never said leaking either. I don't see broken studs either. I see bent studs.
     
    AModelCat, May 23, 2021
    AModelCat, May 23, 2021
    #5
    Vampire, Don379, 77fib77 and 2 others Thank this.
  8. May 23, 2021 #6
    tamip

    tamip Light Load Member

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    Yea I used wrong word lol
     
    tamip, May 23, 2021
    tamip, May 23, 2021
    #6
    77fib77 Thanks this.
  9. May 23, 2021 #7
    tamip

    tamip Light Load Member

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    That one in the picture got fixed before it broke the stud
     
    tamip, May 23, 2021
    tamip, May 23, 2021
    #7
    77fib77 and slow.rider Thank this.
  10. May 23, 2021 #8
    Mattmanstroked

    Mattmanstroked Light Load Member

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    Been there and done this. Had three fail like this in one day.

    Replace the leveling valve.
     
    Mattmanstroked, May 23, 2021
    Mattmanstroked, May 23, 2021
    #8
    Vampire, Coffey, Midwest Trucker and 1 other person Thank this.
  11. May 23, 2021 #9
    tamip

    tamip Light Load Member

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    3 in one day ####
     
    tamip, May 23, 2021
    tamip, May 23, 2021
    #9
    77fib77 and Nostalgic Thank this.
  12. May 23, 2021 #10
    tamip

    tamip Light Load Member

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    Let me guess rear axle too
     
    tamip, May 23, 2021
    tamip, May 23, 2021
    #10
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