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Thread: no brake lights - brake light switch?

  1. #1
    Join Date
    Dec 2011
    Location
    New York, NY
    Posts
    42
    My Cars
    2002 porsche carrera

    no brake lights - brake light switch?

    so my brake lights are not working. i have no idea when this started, but clearly this could be an issue.

    - there is no warning on the mid
    - the bulbs are good
    - when i pull the fuse, i get "brake light circuit" warning on the mid
    - i took a look behind the pedal, the switch is there seemingly fine, with no corrosion. the plunger appears to release and depress with brake pedal movement.

    could that switch be faulty without throwing an mid code?

    where else should i be looking?

  2. #2
    Join Date
    Oct 2008
    Location
    liverpool uk
    Posts
    2,146
    My Cars
    koenig ks8 /e31 850c
    Broken wire in boot lid

  3. #3
    Join Date
    Dec 2011
    Location
    New York, NY
    Posts
    42
    My Cars
    2002 porsche carrera
    third brake in the rear window light does not work also. is a wire in the boot lid still a possibility?

  4. #4
    Join Date
    Sep 2008
    Location
    Santa Barbara
    Posts
    3,462
    My Cars
    91 Dinan860 & 91 850 6sp
    no, it is the switch... a broken wire throws the warning code, the switch doesn't - it just never activates the brake lights
    '91 Dinan 860 Stage III (new 6L engine)
    '91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
    '91 850i 6sp (mint) (sold)
    '90 Dinan 750iL TT stage III (Guido - The Beast)
    '94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
    '96 850Ci, The George Carlin car
    ''73 3.0 csi, '08 535i, '03 X5 4.6is
    ...and a few other non BMW cars

  5. #5
    Join Date
    Dec 2011
    Location
    New York, NY
    Posts
    42
    My Cars
    2002 porsche carrera
    ok...well the switch is available for <$20, so i'll SWITCH it out and let you guys know.

    thanks!

  6. #6
    Join Date
    Jul 2017
    Location
    Santa Barbara, CA
    Posts
    8
    My Cars
    2009 MB CL63 AMG
    If you're going to remove the switch, pull/pry the red collar entirely forward with the brake pedal depressed before pinching the two release tabs to release the switch from the bracket. Don't ask me how I know.
    Last edited by Mark out West; 07-24-2017 at 07:04 PM.

  7. #7
    Join Date
    Dec 2011
    Location
    New York, NY
    Posts
    42
    My Cars
    2002 porsche carrera
    yup. brake light switch. replaced. lights work again.
    i just cut the tip of the plunger/button off and slid the collar and button out, rather that trying to pinch and pull.

  8. #8
    Join Date
    Sep 2008
    Location
    Santa Barbara
    Posts
    3,462
    My Cars
    91 Dinan860 & 91 850 6sp
    Good job
    '91 Dinan 860 Stage III (new 6L engine)
    '91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
    '91 850i 6sp (mint) (sold)
    '90 Dinan 750iL TT stage III (Guido - The Beast)
    '94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
    '96 850Ci, The George Carlin car
    ''73 3.0 csi, '08 535i, '03 X5 4.6is
    ...and a few other non BMW cars

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