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Brake Lights Won't Turn off

Discussion in 'Trucks [ Eighteen Wheelers ]' started by OldRed98, Jul 4, 2017.

Page 2 of 4
  1. Jun 9, 2020 #12
    Peter387

    Peter387 Bobtail Member

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    Jun 9, 2020
    0
    Hi
     
    Peter387, Jun 9, 2020
    Peter387, Jun 9, 2020
    #12
  2. Jun 9, 2020 #13
    Peter387

    Peter387 Bobtail Member

    6
    1
    Jun 9, 2020
    0
    I have problem with 2006 peterbilt 387 , brake lights stays on , checked all fuses and relay.. everything looks ok .. tried to unplug brake switch from trailer valve under cab , did not work either.. does anyone knows if 387 has any other brake switch and cruise control doesn’t work either. Please help me ....
     
    Peter387, Jun 9, 2020
    Peter387, Jun 9, 2020
    #13
  3. Jun 10, 2020 #13
    OldRed98

    OldRed98 Light Load Member

    297
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    Apr 18, 2017
    Colorado
    0
    Hi Peter387. I'm not as familiar with the newer trucks. I would still think your issue is related to the trolley brake or a switch for the foot brake. You've checked the trolley brake? As dumb as that sounds... I was posting on here because my brake lights were not turning off. My trolley brake was just barely on.
     
    OldRed98, Jun 10, 2020
    OldRed98, Jun 10, 2020
    #13
    Peter387 Thanks this.
  4. Jun 10, 2020 #14
    FLHT

    FLHT Road Train Member

    1,006
    1,502
    Aug 2, 2014
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    Carpet or floor mat pushed into foot valve ?
    Trolley Brake ?
     
    FLHT, Jun 10, 2020
    FLHT, Jun 10, 2020
    #14
    Peter387 Thanks this.
  6. Jun 10, 2020 #15
    AModelCat

    AModelCat Road Train Member

    27,713
    145,185
    Jul 7, 2015
    Canuckistan
    0
    Ok for starters, drain all of your air. If the lights go out, you have an air problem. If the lights stay lit, its electrical.
     
    AModelCat, Jun 10, 2020
    AModelCat, Jun 10, 2020
    #15
    xsetra, RubyEagle, Peter387 and 1 other person Thank this.
  7. Jun 13, 2020 #16
    Peter387

    Peter387 Bobtail Member

    6
    1
    Jun 9, 2020
    0
    yes I checked trailer brake too.. nothing under brake pedal .. but I unplugged brake lights at night and plug back in morning .. now everything working normal .. still couldn’t find out the problem.. but cruise control still not work
     
    Peter387, Jun 13, 2020
    Peter387, Jun 13, 2020
    #16
  8. Jun 13, 2020 #17
    Peter387

    Peter387 Bobtail Member

    6
    1
    Jun 9, 2020
    0
    Ok thanks .. I will try this..
     
    Peter387, Jun 13, 2020
    Peter387, Jun 13, 2020
    #17
  9. Jun 13, 2020 #18
    Peter387

    Peter387 Bobtail Member

    6
    1
    Jun 9, 2020
    0
    None.. all clear..
     
    Peter387, Jun 13, 2020
    Peter387, Jun 13, 2020
    #18
  10. Jun 13, 2020 #19
    bad-luck

    bad-luck Road Train Member

    3,023
    5,433
    Nov 16, 2013
    Baltimore, Maryland
    0
    Had a similar issue with my old truck. Try an air hose and blow all the dirt and dust out around the break pedal. Then use wd40, as it displaces moisture. Work the break pedal with your hand or foot. This worked for me, my breaks were actually hanging up for the dirt around the break pedal
     
    bad-luck, Jun 13, 2020
    bad-luck, Jun 13, 2020
    #19
    650cat425 Thanks this.
  11. Jun 14, 2020 #20
    RubyEagle

    RubyEagle Medium Load Member

    631
    777
    Apr 17, 2010
    0
    Had same issue with the 2016 KW. We went to the back of the rig the harness to the brake lights was filled with dirt and sand. Peeled off the tape, cleaned it out, think we added a new plug but it fixed it.
     
    RubyEagle, Jun 14, 2020
    RubyEagle, Jun 14, 2020
    #20
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