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Sinking Sleeper

Discussion in 'Peterbilt Forum' started by Racked&Stacked, Oct 4, 2023.

  1. Oct 4, 2023 #1
    Racked&Stacked

    Racked&Stacked Bobtail Member

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    I have a 2020 Peterbilt 389 car hauler. It’s obvious to me the sleeper has dropped down. I’ve had a couple of mechanics test the leveling valve/ air bags and shocks who’ve all said they’re okay.
    I can tell by the rough/different way it rides, that something’s not right.
    The bags appear to be holding air but could they be dry rotted and/ or maybe I just need new shocks and bags?
    Anyone had any similar issues? IMG_7654.jpeg
     
    Racked&Stacked, Oct 4, 2023
    Racked&Stacked, Oct 4, 2023
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  3. Oct 4, 2023 #2
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Is it ever the right height? Has anybody adjusted the leveling valve?
     
    Big Road Skateboard, Oct 4, 2023
    Big Road Skateboard, Oct 4, 2023
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  4. Oct 4, 2023 #3
    Racked&Stacked

    Racked&Stacked Bobtail Member

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    it’s only been maybe a couple weeks that I’ve been able to notice it sinking and has stayed this way.
    I used to have a truck that would sink down overnight but this one’s never done that.
    Had a Peterbilt mechanic look at it and say the leveling valve was fine and the bags were holding air. He didn’t say anything about adjusting the valve.
     
    Racked&Stacked, Oct 4, 2023
    Racked&Stacked, Oct 4, 2023
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  5. Oct 4, 2023 #4
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    I'd see if the valve has moved. If not pull the rod off and lift the valve arm and see if the bags come up.
     
    Big Road Skateboard, Oct 4, 2023
    Big Road Skateboard, Oct 4, 2023
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  7. Oct 4, 2023 #5
    JB7

    JB7 Medium Load Member

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    Check and make sure that there is no contact between the top of the sleeper and the rails that the SUV is sitting on. Or that nothing is contacting the cab or sleeper. It does not look like there is enough space for the cab/sleeper to rise up and level off. If everything is all clear then check the leveling valve as Big Road Skateboard suggests.
     
    JB7, Oct 4, 2023
    JB7, Oct 4, 2023
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  8. Oct 11, 2023 #6
    Transportauto

    Transportauto Light Load Member

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    Just check the height and reset, maybe the valve rod last ots position, if the bags are not leaking enough to keep the cab up and of the valve is operating normal there isn't much else other then where the bags ride beginning to bend inward, then again the leveling valve would compensate, only seen that on rust buckets where the aluminum was so corroded it became weak.
    Also being a parking lot we don't want much movement, not 1 parking lot I owned had any suspension on the cabs
     
    Transportauto, Oct 11, 2023
    Transportauto, Oct 11, 2023
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  9. Oct 11, 2023 #7
    Lennythedriver

    Lennythedriver Road Train Member

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    Looks like an airbag is blown?
     
    Lennythedriver, Oct 11, 2023
    Lennythedriver, Oct 11, 2023
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