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Thread: Constant brake light

  1. #1
    Join Date
    Feb 2012
    Location
    Roswell GA
    Posts
    844

    Default Constant brake light

    When I got back from https://www.atlantabritishcarfayre.com/ I noticed one of the brake lights was on. This tells me I have at least two problems to solve.
    1) Why is the light on
    2) Why only one
    I've got the factory wiring diagram to look at and a Simpson meter to probe with.

    As to the bulb that wasn't lit, by visual inspection it looks good. The next place I will be looking is the wiring just inside the rear wing, it was damaged and I wrapped some tape around that area.

    Any suggestions on testing the pressure switch and is it in direct contact with brake fluid?

    Thanks y'all

    Carl
    Life happens while you're making other plans
    1995 Caterham Crossflow RHD
    2013 Mini (Her's)

  2. #2
    Join Date
    Jul 2009
    Location
    Arkansas...and Indy
    Posts
    2,911

    Default

    Carl,

    Can you use a jumper wire (bypass the pressure switch) and see if you have brake lights? This might determine if the switch is/is not the problem.
    xcarguy

    Rise of the 'Super Chicken'...a Somewhat 'Suave' Story
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    Live life with passion; history has proven there’s no getting out of it alive.

  3. #3
    Join Date
    Feb 2006
    Location
    Erie, CO
    Posts
    3,941

    Default

    Do both lights come on when you press the brake pedal? One on and one off or one bright and one dim usually means a ground problem.

    Not sure about your Caterham but all of them I have inspected use a push button switch on the brake linkage under the pedal cover.

  4. #4
    Join Date
    Aug 2006
    Location
    Houston, Tx
    Posts
    319

  5. #5
    Join Date
    Sep 2007
    Location
    Houston, TX
    Posts
    341

    Default

    Paul great find at Auto Zone! And $9.69 to boot.
    Carl, Swap brake bulbs and see if the one is burned out. Most likely it is what others are saying, the brake light switch need to be replaced or adjusted/tightened, remove the peddle box cover unplug the brake light switch and see if it goes out. Somethings the jam nuts that locate the switch come loose and that is the problem, simply set it and tighten the jam nuts.

  6. #6
    Join Date
    Aug 2006
    Location
    Houston, Tx
    Posts
    319

    Default

    Ask for stoplight switch for a 1978 Jeep CJ at Autozone. It is a bit long requires a little bending of the terminal.

  7. #7
    Join Date
    Feb 2012
    Location
    Roswell GA
    Posts
    844

    Default

    Thanks for the feedback. I'll get to looking and checking after Irma gets out of town.
    Life happens while you're making other plans
    1995 Caterham Crossflow RHD
    2013 Mini (Her's)

  8. #8
    Join Date
    Feb 2012
    Location
    Roswell GA
    Posts
    844

    Default

    Boy was I wrong. The brake lights work fine with the ignition ON, ignition off, no. The light I observed as on was the tail light. I discovered the light switch was in the middle position, ie "running lights". The reason for the single light being on is yet to be determined. The bulb and socket are fine, so some where further up stream the voltage gets lost.
    Life happens while you're making other plans
    1995 Caterham Crossflow RHD
    2013 Mini (Her's)

  9. #9
    Join Date
    Feb 2012
    Location
    Roswell GA
    Posts
    844

    Default

    I forgot to ask, does the headlight switch light up when the lights are on. Mine does not.
    Is there a US source for a replacement switch that does light up?
    Life happens while you're making other plans
    1995 Caterham Crossflow RHD
    2013 Mini (Her's)

  10. #10
    Join Date
    Oct 2017
    Posts
    1

    Default

    You can check here https://www.icrfq.com/products/ for Duralast Stoplight Switch. Maybe you can find here.

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