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Truck parking breaks won't set even with no air in the tank

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Shawn19, Jul 26, 2023.

  1. Jul 26, 2023 #1
    Shawn19

    Shawn19 Light Load Member

    117
    34
    Apr 20, 2019
    0
    I got a sterling lt9500 dump truck sometime when I set my parking breaks it will not set truck just keep rolling normally when it does set I hear the release of air when it does not set there no release of air what is bad here the yellow parking valve in my cab (I don't think that bad) or the valve that release the air or is there something else some other valve ?
     
    Shawn19, Jul 26, 2023
    Shawn19, Jul 26, 2023
    #1
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  3. Jul 26, 2023 #2
    Big Road Skateboard

    Big Road Skateboard Road Train Member

    6,179
    33,916
    May 2, 2021
    0
    If there's no air, gotta be mechanical. Brake chamber springs broken, way out of adjustment, etc. Unless something is holdingvair in thevlines. Pull hose off chambers and see if there is air.

    Quick release valve failures are common, causing no set, or slow set symptoms
     
    Last edited: Jul 26, 2023
    Big Road Skateboard, Jul 26, 2023
    Big Road Skateboard, Jul 26, 2023
    #2
    D.Tibbitt, kutscher and Oxbow Thank this.
  4. Jul 26, 2023 #3
    livinglife982

    livinglife982 Bobtail Member

    10
    0
    Jul 26, 2023
    0
    Quick release valve, or hand valve.
     
    livinglife982, Jul 26, 2023
    livinglife982, Jul 26, 2023
    #3
  5. Jul 28, 2023 #4
    Deezl Smoke

    Deezl Smoke Medium Load Member

    494
    314
    Feb 12, 2011
    Hillsboro Oregon
    0
    In a dump truck application, I'm thinking debris may have gotten into the system somewhere.
     
    Deezl Smoke, Jul 28, 2023
    Deezl Smoke, Jul 28, 2023
    #4
  7. Aug 9, 2023 #5
    jmlloar

    jmlloar Light Load Member

    100
    13
    Jun 13, 2009
    Keyser, WV
    0
    sounds like bad quick release valve. getting worn inside and sometimes it is sticking and not releasing air to the spring brakes.
     
    jmlloar, Aug 9, 2023
    jmlloar, Aug 9, 2023
    #5
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