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Air brakes

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jasonar15, Dec 14, 2017.

  1. Dec 14, 2017 #1
    Jasonar15

    Jasonar15 Medium Load Member

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    driver was at intersection and when released peddle the brakes didn’t release. Trooper called tow truck and when they showed up they pulled gladhands from trailer and air released and freed up brakes. $400 charge. Is this the foot valve going bad?
     
    Jasonar15, Dec 14, 2017
    Jasonar15, Dec 14, 2017
    #1
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  3. Dec 14, 2017 #2
    Shaggy76

    Shaggy76 Heavy Load Member

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    It sounds more like feedback in the trailer than the foot valve. If it was the foor valve, you would have it in the truck too.

    Most likely you have a brake chamber that is back-feeding or a bad relay valve. I would go to a shop and have the trailer brake system checked.
     
    Shaggy76, Dec 14, 2017
    Shaggy76, Dec 14, 2017
    #2
  4. Dec 14, 2017 #3
    Jasonar15

    Jasonar15 Medium Load Member

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    It was both trailer and truck
     
    Jasonar15, Dec 14, 2017
    Jasonar15, Dec 14, 2017
    #3
  5. Dec 14, 2017 #4
    Shaggy76

    Shaggy76 Heavy Load Member

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    Oh, then check the valve then for issues. It may have bound air in the system.
     
    Shaggy76, Dec 14, 2017
    Shaggy76, Dec 14, 2017
    #4
  7. Dec 14, 2017 #5
    Jasonar15

    Jasonar15 Medium Load Member

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    I removed valve and spring inside was very loose. Very easy to push and a lot of trash in there
     
    Jasonar15, Dec 14, 2017
    Jasonar15, Dec 14, 2017
    #5
  8. Dec 15, 2017 #6
    Shaggy76

    Shaggy76 Heavy Load Member

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    Orlando, FL
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    Sounds like you may have found the issue. That caused the brakes to stick.
     
    Shaggy76, Dec 15, 2017
    Shaggy76, Dec 15, 2017
    #6
    Jasonar15 Thanks this.
  9. Dec 15, 2017 #7
    Aradrox

    Aradrox Heavy Load Member

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    It was grimlins everyone knows that.
     
    Aradrox, Dec 15, 2017
    Aradrox, Dec 15, 2017
    #7
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