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bobtail valve leaking

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Undone, May 11, 2015.

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  1. May 11, 2015 #1
    Undone

    Undone Bobtail Member

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    May 11, 2015
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    I have a 94 volvo single rear axle, I've replaced both brake cans and the bobtail valve but the valve is still leaking air out the relief. ...what do I look at next?
     
    Undone, May 11, 2015
    Undone, May 11, 2015
    #1
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  3. May 11, 2015 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    What is the bobtail valve and what valve is still leaking air out the exhaust?
     
    BoxCarKidd, May 11, 2015
    BoxCarKidd, May 11, 2015
    #2
  4. May 11, 2015 #3
    GrapeApe

    GrapeApe Road Train Member

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    I'm confused as well. Do you have a separate bobtail ratio valve, like an LQ-5? Or do you have a bobtail proportioning relay valve? Were exactly is the leak? When is it leaking? All of the time? Only with the spring brakes released? Only with the service brakes applied? Need more info.
     
    GrapeApe, May 11, 2015
    GrapeApe, May 11, 2015
    #3
  5. May 11, 2015 #4
    cnsper

    cnsper Road Train Member

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    You sure it is not a leveling valve?
     
    cnsper, May 11, 2015
    cnsper, May 11, 2015
    #4
    KW Cajun Thanks this.
  7. May 11, 2015 #5
    KW Cajun

    KW Cajun Road Train Member

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    You beat me to it. That's what I was assuming he was trying to say.
     
    KW Cajun, May 11, 2015
    KW Cajun, May 11, 2015
    #5
  8. May 11, 2015 #6
    Oscar the KW

    Oscar the KW Going Tarpless

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    Pictures are worth a 1000 words.
     
    Oscar the KW, May 11, 2015
    Oscar the KW, May 11, 2015
    #6
  9. May 11, 2015 #7
    cnsper

    cnsper Road Train Member

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    That's funny, mine are only worth about 27 words....:)
     
    cnsper, May 11, 2015
    cnsper, May 11, 2015
    #7
    icsheeple Thanks this.
  10. May 12, 2015 #8
    Undone

    Undone Bobtail Member

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    May 11, 2015
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    It's a Bp-r1 valve. Leaks air out the bottom relief when you release the tractor brakes and get ready move. It's connected to the service side of the brakes, from what I've read supposed to make breaks less aggressive when not pulling a trailer.
     
    Undone, May 12, 2015
    Undone, May 12, 2015
    #8
  11. May 12, 2015 #9
    Undone

    Undone Bobtail Member

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    May 11, 2015
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    And only leaks when spring brakes are released.
     
    Undone, May 12, 2015
    Undone, May 12, 2015
    #9
  12. May 12, 2015 #10
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Disconnect the lines from the chambers and the control port. Chalk wheels, build air and release parking brake. Nothing should leak air. Air from chamber hose, bad chamber. Air from control hose, could be swapped with supply hose,( other hose on top of valve) or some thing is sending control air when it should not. Start by checking for brake pedal or piston under it sticking. No air leak from lines, new valve is bad.
     
    BoxCarKidd, May 12, 2015
    BoxCarKidd, May 12, 2015
    #10
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