Peterbilt keeps breaking airbag studs

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

  1. lester

    lester Road Train Member

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    Judging by that odd wear on the inside tire something is out of alignment
     
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  3. tamip

    tamip Light Load Member

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    The leaf spring bushings were just replaced so that probably had something to do with it
     
  4. Mattmanstroked

    Mattmanstroked Light Load Member

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    The answer to this riddle has been given

    Three failures in one day. One of mine was failure of a new air bag. Replaced leveling valve. 100,000 miles later no more issues.
     
  5. tamip

    tamip Light Load Member

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    So if I change the leveling valve and it continues to do this then what
     
  6. Mattmanstroked

    Mattmanstroked Light Load Member

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    Leveling valve fixed mine.
    Will it fix yours I can't say for certain. I didn't change anything but 3 air bags and the leveling valve on mine. Didn't do anything with any suspension components. One of the new air bags didn't last but a little over 100 miles before it failed just like the older ones.

    Ran the truck another 100,000 miles with two of the old air bags and the two that I replaced. Didn't give me anymore trouble.

    You mentioned the leveling valve was replaced on yours about 3 years ago? Had any troubles until just now with this?
    Have you checked your ride height? From the picture of the rod that goes to the axle it doesn't appear to be bent. So unless someone has messed with the ride height nothing should have changed.
     
  7. Don379

    Don379 Medium Load Member

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    ITs very difficult to find a shop that does that stuff bro. Just start with lowering your bags. They are overfilled by alot and thats why the heck they are blowing out like that. So overfilled that they blow out the back. No support. . I would start by dropping them down to about 10.25 inches about where mine are set at. You can do this easily without going through all that nonsense in video. The forward axle has a weld through the centertube. Measure from that centerline on axle on the forward axle to directly to the bottom of the frame rail straight up and down. Adjust your leveling valve accordingly. Then take the truck for a quick trip up the road and get it up to 50-60 mph and listen for any driveline vibration or noise due to pinion angles. If none, you are good. Enjoy no bag blow outs

    New leveling valve is only if the valve is leaking or it is over inflating becuase wont shut off. That would be easy to know. Your load gauge would be reading 120 psi if it isnt shutting off.
    Start with the basics. If you can adjust your leveling valve and it stabilzes at normal unladen psi. The leveling valve is fine
     
  8. Don379

    Don379 Medium Load Member

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    Leveling valve when it fails doesnt shut off or it leaks air. Your load gauge would tell you if it is stuck open and has 120 psi in bags. Ill bet your load gauge reads normal unladen.
     
  9. Brettj3876

    Brettj3876 Road Train Member

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    If it's growling like you said im betting ride height is off + some alignment issues with that tire pattern
     
  10. tamip

    tamip Light Load Member

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    I haven't checked my ride height since Peterbilt last did it several years ago when I did the leveling valve. The problem just started last month with it breaking the studs. To my knowledge no one has messed with the ride height. It isn't making any strange noises while driving. I have had all my bags deflate when one of the studs broke and wore a hole in the bag so I would know that sound if it did it again. I'm gonna get all that checked again when I get home. I've also heard that maybe the shocks are letting it extend too far I don't know. It's been at least a year since shocks were done maybe 2 yrs. The bushings for the shocks are already cracking so those will be changed too.
     
  11. tamip

    tamip Light Load Member

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    I don't have a load gauge
     
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