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Jake brakes Problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Truvker dad, Aug 11, 2020.

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  1. Aug 11, 2020 #1
    Truvker dad

    Truvker dad Bobtail Member

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    1997 detroit 60 series engine The jake brakes keep coming on even with jake brake switch in the off position .I already changed the switch. Any knowledge of this would be greatly appreciated.
     
    Last edited: Aug 12, 2020
    Truvker dad, Aug 11, 2020
    Truvker dad, Aug 11, 2020
    #1
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  3. Aug 11, 2020 #2
    Razorwyr

    Razorwyr Road Train Member

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    If its in the "on" position, its supposed to be coming on
     
    Razorwyr, Aug 11, 2020
    Razorwyr, Aug 11, 2020
    #2
    LameMule Thanks this.
  4. Aug 12, 2020 #3
    Truvker dad

    Truvker dad Bobtail Member

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    I meant to say off position (pardon me)
     
    Truvker dad, Aug 12, 2020
    Truvker dad, Aug 12, 2020
    #3
  5. Aug 12, 2020 #4
    Truvker dad

    Truvker dad Bobtail Member

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    Oct 28, 2018
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    97 detroit 60 series.Jake brake keeps coming on even with the jake brake switch in the off position.Any help would be appreciated.Thanks
     
    Last edited: Aug 12, 2020
    Truvker dad, Aug 12, 2020
    Truvker dad, Aug 12, 2020
    #4
  7. Aug 12, 2020 #5
    AModelCat

    AModelCat Road Train Member

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    Sounds to me you've got two possibilities:

    A harness/wiring issue. If you can plug in to the truck you could see if something is commanding the jake on. Maybe a short to power on the jake solenoid wire, actuating the solenoid when the jake is not commanded on.

    Other possibility could be an issue with oil getting past the solenoids on the jake heads, actuating the jake pistons. Not sure how likely this scenario is but I could see it happening.
     
    AModelCat, Aug 12, 2020
    AModelCat, Aug 12, 2020
    #5
    magoo68 Thanks this.
  8. Aug 12, 2020 #6
    Truvker dad

    Truvker dad Bobtail Member

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    My mechanic says it can't be the jake wiring harness he keeps say ecm and i just don't think so.
     
    Truvker dad, Aug 12, 2020
    Truvker dad, Aug 12, 2020
    #6
  9. Aug 12, 2020 #7
    AModelCat

    AModelCat Road Train Member

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    It could be the ECM but it is very unlikely. They have a very, very low rate of failure.
     
    AModelCat, Aug 12, 2020
    AModelCat, Aug 12, 2020
    #7
    magoo68 Thanks this.
  10. Aug 12, 2020 #8
    magoo68

    magoo68 Road Train Member

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    Unplug the switch and see if issue persists . If it doesn’t then new switch is faulty or wrong one maybe.. if issues persists I’d check wiring closely to see if it’s rubbed through and power is crossing over.
     
    magoo68, Aug 12, 2020
    magoo68, Aug 12, 2020
    #8
  11. Aug 12, 2020 #9
    Truvker dad

    Truvker dad Bobtail Member

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    Thanks for your feedback I will have a look at it this weekend
     
    Truvker dad, Aug 12, 2020
    Truvker dad, Aug 12, 2020
    #9
  12. Aug 12, 2020 #10
    Hulld

    Hulld Road Train Member

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    Hook a test light in to the wiring going In to the Jake solenoids.
    If you have power there when the the problem occurs it’s an electrical problem.
    If the problem occurs with no power there it’s a hydraulic mechanical problem under the valve cover.
     
    Hulld, Aug 12, 2020
    Hulld, Aug 12, 2020
    #10
    shawnhhllc and magoo68 Thank this.
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