Dragging Brakes on a 2014 Volvo D13

Discussion in 'Trucks [ Eighteen Wheelers ]' started by hlancaster929, Nov 27, 2020.

  1. hlancaster929

    hlancaster929 Bobtail Member

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    Nov 27, 2020
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    I have a D13 that when the brakes are pressed for more than a sec have trouble releasing. It mostly gets stuck at 10psi of applied pressure. But sometimes worse. Most of the time I have to stop and cycle thru pulling the trailer brake button and that gets them to release but I can’t do that on the highway, and the dragging is not good, I am going to either burn my brakes up or wear them down when I can’t just stop. Any suggestions on what could be the issue and some solutions other than taking it to a shop. It does it on the trailer and tractor.
     
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  3. AModelCat

    AModelCat Road Train Member

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    I hope you're willing to do some troubleshooting because nobody can tell you 100% what the issue is without some diagnosing.

    I'd start with plumbing in a pressure gauge off the treadle valve. See if the treadle valve is sticking.
     
  4. baha

    baha Road Train Member

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    Take a look at the brake shoes with brakes set to see if the. S Cams to see if them are about to flip over, just one worn out brake shoe can make s cam try to roll over so far that it will not release when you let off brake.?
     
  5. BoxCarKidd

    BoxCarKidd Road Train Member

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    I would lock for a problem between the pedal and treadle valve ( or with the piston just before the valve ).
     
    lester Thanks this.
  6. bavarian

    bavarian Medium Load Member

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    If your unit is newer, you may have an option that is called "hill start assist". It holds the brakes applied with the pressure that was applied when the vehicle came to stop. If you want to get moving, the produced torque in the power train is calculated and the brakes will be released at the point when the torque exceeds the brake force. It makes it feel like brakes are stuck.

    You should be able to turn that option off.

    I'm not saying that anything else is ruled out.
     
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