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Brake Lights Wont Turn Off?

Discussion in 'Truck & Equipment Repair' started by GTLS, Jan 21, 2010.

  1. GTLS

    GTLS Member
    Messages: 65

    For some reason when I was coming home last night, my brake lights wouldn't turn off. They were lit up as bright as they could(as if I was pressing the brake pedal) and they wouldn't turn off. I ended up disconnecting the battery after failing at trying to find the fuse which was a good temporary fix, but what could be wrong? And I know you're thinking that the floor mat may have jammed in the brake pedal, but that wasn't it, I already checked. Also, I'm not sure if this makes a difference, but I have this thing called a "Brake Master", and it accidentally got knocked off last night trying to put the truck back into 2WD because it was only held on by 1 screw. Any help would be appreciated.

  2. mansf123

    mansf123 Senior Member
    from mass
    Messages: 817

    try hitting the hazards on and off, i think the relay runs thru the hazard. could be dust in there...thats what happened to me. could also be what you knocked off
  3. GTLS

    GTLS Member
    Messages: 65

    Ok, thanks! Another LS member said there was a switch behind the brake pedal that tends to get stuck in Fords and Dodges. I'll check both of them out. And after looking, I don't believe it's that Brake Master thing... I think that's for trailers with brakes, but I'll look into both possibilities tomorrow. Thanks for the reply
  4. swtiih

    swtiih PlowSite.com Addict
    Messages: 1,179

    check the arm of the brake pedal usually there is a switch that the arm hits
  5. DugHD

    DugHD Senior Member
    from Maine
    Messages: 420

    Very good chance the plunger on the brake switch is stuck in.
  6. poncho62

    poncho62 Senior Member
    Messages: 431

    Yeah...and they slide out of the holder sometimes
  7. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Is the brake light over the rear window on also?
  8. maxximus98

    maxximus98 Member
    Messages: 52

    Sounds like a brake switch to me also!! They get stuck frequently. A little contact may clean it up!!
  9. delcosnow14

    delcosnow14 Junior Member
    Messages: 12

    theres a switch behind the brake pedal ive seen alot of fords and dodges that have a spacer that pushes the brake switch and that tends to fall off not letting the switch in far enough. i have just epoxied a a couple of plastic washers on there when they fall off. let me know how u make out.
  10. GTLS

    GTLS Member
    Messages: 65

    Yes it is......
  11. clark lawn

    clark lawn PlowSite.com Addict
    from NE ohio
    Messages: 1,233

    i had that problem on my dodge found i had some corrosion in the the trailer plug that was making a connection between the constant power wire and the brake light wire that was backfeeding to the brake lights.
  12. AC2717

    AC2717 Senior Member
    Messages: 690

    This is usually the case, real cheap part and real easy to do
  13. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    That rules out the trailer plug.......
  14. Mr.Markus

    Mr.Markus PlowSite Fanatic
    Messages: 5,779

    Try unpluging the power from the matercylinder, with the engine running. Turn off the engine and replug it in. Then restart your engine. Use to reset our ABS this way. May not be the same on dodge or ford but hey every little bit helps right.
  15. PeterD

    PeterD Junior Member
    Messages: 26

    At least in my truck, the trailer brake controller can energize the brake lights. But... It could be either. The only thought I have is that with the 'accident' with the trailer controller happening at about the same time that makes me suspect it...
  16. GTLS

    GTLS Member
    Messages: 65

    That's what I'm also thiking, and I looked today, but I didn't see a switch? And with the Brake Master thing, you're getting into some serious wiring. It gets thick! Tomorrow when I have more time I'll look into it...
  17. maxximus98

    maxximus98 Member
    Messages: 52

    Whats a brake master thing???
  18. Mr.Markus

    Mr.Markus PlowSite Fanatic
    Messages: 5,779

    "Brake master" in this thread I think refers to the trailer control...
    "Brake mastercylinder" is the oil reservoir under the hood.
  19. GTLS

    GTLS Member
    Messages: 65

    Problem solved... We disconnected the Brake Master, and the lights went off. So something happened while shifting back into 2WD
  20. PeterD

    PeterD Junior Member
    Messages: 26

    Good to hear you are up and running OK... I just noticed you are in our area, (I'm in Jaffrey). If you have similar electrical problems drop me a PM, I do a lot of electrical stuff on vehicles.