Trailer leveling valve

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by ZiplocW2019, Nov 25, 2023.

  1. ZiplocW2019

    ZiplocW2019 Bobtail Member

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    Replaced with new one, now air bags won't inflate. I replaced with identical unit. All air lines going to same location. Valve has integral dump

    1. When I push in trailer supply valve in truck - brakes release no air to airbags.
    2. When I pull out trailer supply - brakes set and air bags rise

    I don't understand...... IMG_2953.jpg
     
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  3. wichris

    wichris Road Train Member

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  4. IH Truck Guy

    IH Truck Guy Road Train Member

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    That don't look like a new valve..
     
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  5. ZiplocW2019

    ZiplocW2019 Bobtail Member

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    this was pic from before removal. everything worked. any chance pressure protection valve is bad?
     
  6. JB7

    JB7 Medium Load Member

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    See attached, page 3 has a diagram. Did you buy the same brand valve? Some may have ports in different places. Do you still have the old valve. Look to see if the ports are marked and they are the same.
    Probably not related to your problem but the connection where the vertical rod bolts to the valve rod is worn. Not just the washer hanging down but the rubber appears worn as the bolt does not look centered.

    Still sounds like the air lines are not connected properly.
    Not related but that looks like a big gap between the brake shoe and drum in the pic.

    Why were you replacing the valve to start with?
     

    Attached Files:

    Last edited: Nov 25, 2023
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  7. wichris

    wichris Road Train Member

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    Move the valve body 180 degrees and put the lines back like in the picture
     
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  8. Oxbow

    Oxbow Road Train Member

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    I'm not that smart, so I would disconnect the linkage to the axle and the output line and move the lever to see when the air comes out..........and then realize I have it 180 degrees off!
     
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  9. wichris

    wichris Road Train Member

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    Take off the airline and the exhaust fitting. Take off the two bolts holding the valve body. Turn the valve body 180. Put the air line and exhaust back like in the picture. 15 minutes work. Not like nobody has done that before.
     
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  10. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Same valve and mounted on the same side of the bracket….?
     
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  11. ZiplocW2019

    ZiplocW2019 Bobtail Member

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    Put old valve back in worked as it should. Faulty replacement
     
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