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Air suspension leveling valve

Discussion in 'Ask An Owner Operator' started by Hayland, Jul 8, 2019.

  1. Jul 8, 2019 #1
    Hayland

    Hayland Bobtail Member

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    Jul 8, 2019
    0
    Hello all,

    I have been having an issue with a 2013 Peterbilt 579. When driving my air suspension leveling valve is activated and dumps the air on the bags of my truck. This happens empty, fully loaded, and bobtail. There is no warning on my dashboard just the grinding of my axles and the switch in the cab is in the off position. When the air dumps my tractor air bags I turn the switch to the on position then to the off position and it corrects itself. This could happen several times a day or weeks apart. Had two different TA’ look at it and don’t seem to find the problem. Any help is appreciated, thanks.
     
    Hayland, Jul 8, 2019
    Hayland, Jul 8, 2019
    #1
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  3. Jul 8, 2019 #2
    SteveScott

    SteveScott Road Train Member

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    Go to a Peterbilt dealer and don't let a TA mess with it. Sounds like a bad solenoid.
     
    SteveScott, Jul 8, 2019
    SteveScott, Jul 8, 2019
    #2
    flood, Long FLD and Bean Jr. Thank this.
  4. Jul 9, 2019 #3
    Hayland

    Hayland Bobtail Member

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    Jul 8, 2019
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    Bad solenoid? Would that be the protection valve or the leveling valve?
     
    Hayland, Jul 9, 2019
    Hayland, Jul 9, 2019
    #3
  5. Jul 9, 2019 #4
    Ridgeline

    Ridgeline Road Train Member

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    Go to the dealer and have them look at it. I have electronic leveling on a few trucks and one was a nightmare to get fixed, it was a number of things but it was under warranty so it was just downtime costs I had to deal with. Shops like t/a can barely change oil and are not equipped for much more than oil changes.
     
    Ridgeline, Jul 9, 2019
    Ridgeline, Jul 9, 2019
    #4
    HoneyBadger67 Thanks this.
  7. Jul 9, 2019 #5
    Powder Joints

    Powder Joints Subjective Prognosticator

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    Sep 25, 2007
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    The tractor protection valve is part of the brake air lines running to the trailer.
     
    Powder Joints, Jul 9, 2019
    Powder Joints, Jul 9, 2019
    #5
  8. Jul 9, 2019 #6
    Long FLD

    Long FLD Road Train Member

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    The switch in your dash is electric. Could be a faulty switch, a bad solenoid, or a hole rubbed in a wire between the two. Happy hunting!
     
    Long FLD, Jul 9, 2019
    Long FLD, Jul 9, 2019
    #6
  9. Jul 10, 2019 #6
    Midwest Trucker

    Midwest Trucker Road Train Member

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    Aug 31, 2018
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    My little 2011 KW 660 daycab taught me something new the other day.

    It would randomly lose all the air in its bags and then the drive line would start grinding.

    Replaced the leveler and the dash switch. Thought all was fixed and it did it again couple days later. Traced the airline from the leveler back up the truck and it hooked into the air dryer. Well, the line wasn’t getting any air. What I did next was replaced the air dryer filter. Boom it aired up immediately and I haven’t had a problem since.
     
    Midwest Trucker, Jul 10, 2019
    Midwest Trucker, Jul 10, 2019
    #6
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