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1994 kenworh tradle

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Perchie15, Aug 20, 2023.

  1. Aug 20, 2023 #1
    Perchie15

    Perchie15 Light Load Member

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    Aug 16, 2021
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    I have an issue with a tradle valve on a 1994 kenworth. I changed it cuz I thought old one was broken. But after putting new one on it does same thing. Truck gets no brakes. Doesn’t release the air. Gauge stays up on air apply psi and the spring under brake pedal is stiff.
     
    Perchie15, Aug 20, 2023
    Perchie15, Aug 20, 2023
    #1
    BoxCarKidd Thanks this.
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  3. Aug 20, 2023 #2
    AModelCat

    AModelCat Road Train Member

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    Sounds more like a relay valve out back may be sticking. The treadle valve does not actually send the air to the chambers, it sends air to the top port of the relay valve. Just a small volume of air to shuttle the relay valve and allow air directly from the tanks to fill the chambers. Its done this way to reduce lag time.

    I would start with checking the service relay valve and go from there.
     
    AModelCat, Aug 20, 2023
    AModelCat, Aug 20, 2023
    #2
    singlescrewshaker and blairandgretchen Thank this.
  4. Aug 20, 2023 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Did you take the piston out under the pedal and clean all that up?
     
    BoxCarKidd, Aug 20, 2023
    BoxCarKidd, Aug 20, 2023
    #3
  5. Aug 20, 2023 #4
    Perchie15

    Perchie15 Light Load Member

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    Aug 16, 2021
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    Well it’s a new one now. Like which piston outta the air valve? There wasn’t one under the pedal just like a roller to sit in top of that spring/piston
     
    Perchie15, Aug 20, 2023
    Perchie15, Aug 20, 2023
    #4
  7. Aug 22, 2023 #5
    Diesel Dave Australia

    Diesel Dave Australia Bobtail Member

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    Aug 22, 2023
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    Possibly the reference line to the brake relay,
    Could be blocked or kinked.
    Dont just throw the parts cannon at it. usually its fixable with something minimal
     
    Diesel Dave Australia, Aug 22, 2023
    Diesel Dave Australia, Aug 22, 2023
    #5
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