1998 406 D8 wagon main brake lights not working but upper one is
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  1. #1
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    Default 1998 406 D8 wagon main brake lights not working but upper one is

    I'm stumped. Our 1998 406 wagon suddenly has an issue with the brake lights. The main brake lights do not work but the upper one does so can I assume the brake light switch is not the issue? How could the upper light work if the switch was not working? Yes I've checked and replaced the bulbs. I also checked the brake light switch and adjusted it as it seems as if it had slipped forward a bit. I have noticed a possible related issue when I turn the indicators on, I can hear the flasher unit inside the dash go on and off very quickly many times randomly. I hate electrical gremlins as everyone else does but I was hoping someone else had fixed a similar issue. Thanks!

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  2. #2
    1000+ Posts REN TIN TIN's Avatar
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    It's likely the earth is dodgy.
    Although both sides going out at the same time is unusual.
    Check the earth wire(s) are making good electrical contact with the body.
    The auxiliary brake light has a separate earth so is not affected.
    The indicators probably have the same earth as the brake lights so the brake light are coming on with the indicators.
    The extra load of the brake lights can cause the flasher unit to flash quicker than normal.
    "I cannot help but notice that there is no problem between us that cannot be solved by your departure. Mark Twain"

  3. #3
    UFO
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    CitroŽn Tragic UFO's Avatar
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    Do like I had to do in our C4 recently. This is highly technical....

    Grab each globe like you're going to remove it. ie push in and turn it a bit. Repeat a few times. Test the functions now with use of a brake pedal pushing assistant (ignition in ON position).

    It's likely there's some corrosion on the bulb holder terminals.
    Craig K
    2009 C5 HDi Exclusive

  4. #4
    1000+ Posts Beano's Avatar
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    I had the same experience as Ren Tin Tin....with other cars. A bad earth can cause all manner of weird effects as the electricity goes to ground through other circuits.

  5. #5
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    I feel so stupid...I thought the brake lights were in the lights on the tailgate and had neglected to check the ones on the body...it was the bulbs!

  6. #6
    1000+ Posts Beano's Avatar
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    Fathead, fathead !

    Still, it must be damn cold down there in Tasmania. God knows, even here in Brisbane my brain freezes up !

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