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jake brake not working

Discussion in 'Kenworth Forum' started by jsmr, Apr 30, 2015.

  1. Apr 30, 2015 #1
    jsmr

    jsmr Bobtail Member

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    Apr 30, 2015
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    I have a 2005 w900 with a c15, my jake works when it is cold outside, when it starts warming up around 45 degrees it will work intermittently, if I sit with the heat running it will not work till I start driving to get cold air flowing, above 60 not working at all along with the cruise. Cat and Kenworth can not find the problem. I have had the motor rebuilt, the jakes rebuilt, new breaker, new clutch switch, and I have power to the on off switch. Does anyone have any ideas, I an starting to lose my mind. Thank you.
     
    jsmr, Apr 30, 2015
    jsmr, Apr 30, 2015
    #1
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  3. Apr 30, 2015 #2
    scotasmus

    scotasmus Bobtail Member

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    Apr 28, 2015
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    That is a weird one do you have a pro link or scan tool to check and see if the ecm is reading your clutch switch is on or off. I would check it when it is cold and when hot. I know you put a new switch in but that would also eliminate any wiring issue in the clutch switch system.
     
    scotasmus, Apr 30, 2015
    scotasmus, Apr 30, 2015
    #2
    jsmr and icsheeple Thank this.
  4. Apr 30, 2015 #3
    icsheeple

    icsheeple Trailing the Herd

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    Kansas City, KS
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    Good idea, but, wouldn't his cruise control not be working too?
     
    icsheeple, Apr 30, 2015
    icsheeple, Apr 30, 2015
    #3
  5. Apr 30, 2015 #4
    scotasmus

    scotasmus Bobtail Member

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    Apr 28, 2015
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    He said his cruise is not working either.
     
    scotasmus, Apr 30, 2015
    scotasmus, Apr 30, 2015
    #4
  7. Apr 30, 2015 #5
    icsheeple

    icsheeple Trailing the Herd

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    Oh! My bad... I see that now. Yeah, my money is on the clutch pedal switch or wiring.
     
    icsheeple, Apr 30, 2015
    icsheeple, Apr 30, 2015
    #5
  8. Apr 30, 2015 #6
    scotasmus

    scotasmus Bobtail Member

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    Apr 28, 2015
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    Ya me to. Good luck man
     
    scotasmus, Apr 30, 2015
    scotasmus, Apr 30, 2015
    #6
  9. Apr 30, 2015 #7
    Meskie

    Meskie Bobtail Member

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    Apr 8, 2009
    Saskatoon Saskatchewan
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    Sounds like wiring or switch caused by resistance. Heat causes resistance. Could be a bad ground.
     
    Meskie, Apr 30, 2015
    Meskie, Apr 30, 2015
    #7
    jsmr Thanks this.
  10. May 1, 2015 #8
    jsmr

    jsmr Bobtail Member

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    Apr 30, 2015
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    I noticed with my air on it doesn't fail as much. Is there a solenoid in the dash anywhere the all the wires go to before the fuse box.
     
    jsmr, May 1, 2015
    jsmr, May 1, 2015
    #8
  11. May 2, 2015 #9
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    From my experience with my truck, when my Cruise and Jake started working sporadically I traced it to the Accelerator Pedal Switch and Pedal. I installed a new one and it works perfect.

    The Accelerator Pedal was worn out had play in it and was not giving the ECM the right Pedal Position signal, in turn the Jake and Cruise Control functions were affected.
     
    boneebone, May 2, 2015
    boneebone, May 2, 2015
    #9
    jsmr Thanks this.
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