Trouble with trailer brakes

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Freelancer001, Oct 24, 2014.

  1. Freelancer001

    Freelancer001 Bobtail Member

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    Oct 24, 2014
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    I have a trailer has 3 axles with all service brake chambers ( dont have spring brakes ). the problem is that the brakes apply when i push the dash valves in. I put a new Emergency Relay Valve on trailer and no change. Could someone help me? Could it be the tractor? Could it be a bad valve?
     
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  3. Pool6710

    Pool6710 Medium Load Member

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    Aug 10, 2014
    Minnesnowta
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    Red and blue lines on the correct sides from the tractor?

    do you get any air out the service line when the button is in?
     
  4. Freelancer001

    Freelancer001 Bobtail Member

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    Oct 24, 2014
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    Traced all the lines, they are all hooked up right. did not try to see if service side had air or not
     
  5. Pool6710

    Pool6710 Medium Load Member

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    Aug 10, 2014
    Minnesnowta
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    Has this trailer sat a long time?

    you could try back feeding the red line to the service line a few times.
     
  6. Freelancer001

    Freelancer001 Bobtail Member

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    Oct 24, 2014
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    The trailer has been sitting for a while because of this brake problem. how do i back feed?
     
  7. Pool6710

    Pool6710 Medium Load Member

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    Aug 10, 2014
    Minnesnowta
    0
    Put the red line onto the blue.
     
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