How to tell when airbags need to be replaced?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Thetrashnoob, May 5, 2021.

  1. jason6541

    jason6541 Road Train Member

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    Unhook leveling valve and manually overinflated the bags beyond normal
    Hopefully you can see base of the bags as they uncurl from bottom seat
     
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  3. jason6541

    jason6541 Road Train Member

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    I wonder if those bags are the correct ones. Maybe they are to short for application. May want to cross reference part # with originals.
     
  4. lester

    lester Road Train Member

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    Set the lift axle down and see if it still looses pressure. That amount in a couple hours isn't bad. Annoying sure.

    There is no leveling valve on the pusher axle, just a pressure regulator. To check you main bags un hook the leveling valve and raise the bags up. That will also over extend you pusher bags so you can check them all
     
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  5. Rideandrepair

    Rideandrepair Road Train Member

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    I’ve had air bags leak, always at the base. Accidentally found one in the rain, it was whistling. They may even stop leaking when more air is added, since the leaks on top of the base. Way over inflating them can cause a leak at the base. Hard to find. Have to spray bottom of bag, at base, maybe at different heights. Yours look fairly new. If they’re not leaking, or dry rotted, they’re good.
     
    Last edited: May 7, 2021
    Don379 and God prefers Diesels Thank this.
  6. Shawn2130

    Shawn2130 Heavy Load Member

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    Red circle is the lift axle air bags.

    4F9115A4-6BC0-43F5-8B4D-D5208D4BCF34.jpeg

    Spray these with soapy water.
     
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  7. Thetrashnoob

    Thetrashnoob Light Load Member

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  8. Thetrashnoob

    Thetrashnoob Light Load Member

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    Ive sprayed those with water, those aren’t leaking and look fairly new as well.
     
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  9. Thetrashnoob

    Thetrashnoob Light Load Member

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    The video is with the axle down and you can just hear it bleeding out bed. The pressure loss is annoying but not the end of the world, but I’d prefer to fix it if it’s easy enough. When the axle is down the pressure gauge is only reading 20psi, should I try increasing the pressure any? I don’t think it’ll make a difference as it’s just bleeding air at a extremely fast rate.
     
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