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85 W900 Parking brake

Discussion in 'Kenworth Forum' started by Goldie85, Nov 13, 2020.

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  1. Nov 13, 2020 #1
    Goldie85

    Goldie85 Bobtail Member

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    Nov 13, 2020
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    I have a 85 W900B with a 3406 Cat. The yellow parking brake valve wont stay engaged. I can hold it in and drive the truck. Sometimes I can get it to stay in for a few minutes, but then it will leak for about 2 seconds then pop out on me, then i just hold it by hand for a while. Ill try to let off and if I dont hear it leak then it will stay but eventually leak then pop out. I had a brake chamber leaking and thought that was it, changed the chamber and nothing changed. I dont have any audible air leaks. Could it just be the valve on the dash needs to be replaced?
     
    Goldie85, Nov 13, 2020
    Goldie85, Nov 13, 2020
    #1
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  3. Nov 13, 2020 #2
    FozzyNOK

    FozzyNOK Road Train Member

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    You need new O rings on the spool valve.. or a new valve. ASAP.. like MORE than ASAP
     
    FozzyNOK, Nov 13, 2020
    FozzyNOK, Nov 13, 2020
    #2
    Roger McG Thanks this.
  4. Nov 13, 2020 #3
    I glide 47

    I glide 47 Road Train Member

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    New valve at truck pro or fleet pride or any local truck parts store
     
    I glide 47, Nov 13, 2020
    I glide 47, Nov 13, 2020
    #3
    Roger McG Thanks this.
  5. Nov 14, 2020 #4
    Roger McG

    Roger McG Light Load Member

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    Does this truck have 3 brake buttons 1 red 1 blue 1 yellow? if so push in the blue and yellow, try that
     
    Roger McG, Nov 14, 2020
    Roger McG, Nov 14, 2020
    #4
  7. Nov 14, 2020 #5
    Goldie85

    Goldie85 Bobtail Member

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    Nov 13, 2020
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    It has a third one but its not blue, its just metal. Im guessing its supposed to be blue. Ive tried putting them in together and nothing. What is the blue one used for? I dont ever use it.
     
    Goldie85, Nov 14, 2020
    Goldie85, Nov 14, 2020
    #5
  8. Nov 14, 2020 #6
    Roger McG

    Roger McG Light Load Member

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    Oct 22, 2016
    western mass
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    If I recall Blue button was tractor only but I thought both had to be in. Is this a recent problem that has just turned up? If it is something that has just come up, as others above has stated replace the valve. A lot of todays replacement parts are no longer repairable.
     
    Roger McG, Nov 14, 2020
    Roger McG, Nov 14, 2020
    #6
  9. Nov 14, 2020 #7
    AModelCat

    AModelCat Road Train Member

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    Yeah I believe you had to charge the system with the yellow button first, then use the blue button for the tractor and red for the trailer.
     
    AModelCat, Nov 14, 2020
    AModelCat, Nov 14, 2020
    #7
    Roger McG Thanks this.
  10. Nov 14, 2020 #8
    AModelCat

    AModelCat Road Train Member

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    If you have no obvious and serious leaks, chances are the dash valve is done.
     
    AModelCat, Nov 14, 2020
    AModelCat, Nov 14, 2020
    #8
    Roger McG Thanks this.
  11. Nov 14, 2020 #9
    FozzyNOK

    FozzyNOK Road Train Member

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    Blue was an emergency system that has its own air tank/supply. It was only used to get the truck to move a VERY short distance to clear traffic etc
     
    FozzyNOK, Nov 14, 2020
    FozzyNOK, Nov 14, 2020
    #9
  12. Nov 14, 2020 #10
    FozzyNOK

    FozzyNOK Road Train Member

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    [​IMG]
     
    FozzyNOK, Nov 14, 2020
    FozzyNOK, Nov 14, 2020
    #10
    AModelCat Thanks this.
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