Question about 1999 Audi A4

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Left rear brake light stopped working but bulb and fuses are OK.

Dashboard warning system indicates brake light failure.
Left rear brake light does not work when brake pedal depressed.
Bulb checked and definitely not "burnt out". Fuses checked and definitely not "burnt out". (All 5 amp fuses checked and OK)
Car is 1999 A4 Saloon.
Any ideas?

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  • 5 more comments 
  • b1lb0b4gg1ns Jan 03, 2009

    Reply to Bunnydawg:

    I checked the bulb using an AVOmeter. I also replaced the bulb as a double check. I have also tested the circuit on the rear light assembly - just in case there was a brake there but all is OK.

    There is a suggestion in the owners guide that the problem may be with the brake light switch - but I would have thought that that would have affected all of the rear brake lights, not just the left one.

  • b1lb0b4gg1ns Jan 03, 2009

    Reply to regeetone:

    Thanks. Interestingly, there was condensation on the outside of the bulb when I first opened up the assembly. However, I have just tested the circuit to the bulb (with 'her indoors' depressing the brake pedal) and there is no voltage. I think this points to the brake light switch or a circuit break in the wiring? Thanks again and have a happy new year!

  • Roberta Smith
    Roberta Smith May 11, 2010

    how exactly did you check the bulb ?

  • Anonymous Mar 13, 2014

    Left brake light quit working.bulbs and fuses are OK

  • Anonymous Mar 19, 2014

    all other lights work fuses are good but no center or two side rear lights illuminate when brakes are depressed

  • Anonymous Mar 29, 2014

    Checked the fuse

  • Anonymous Mar 30, 2014

    Brake lights stay on when car is running



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Take the bulb back out have someone sit in car apply brake get your self a circuit tester and check to see if this circuit is carrying efficient 12 volt current! some times in cold weather these bulbs get hot with long period of breaking and when released condensate and rust begins and you get what you have perhaps bad socket! this would be a ideal location to begin and probably end,

Posted on Jan 03, 2009

  • Craig Buentgen Jun 25, 2013

    no i have a honda accord


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You need to buy a new Audi

Posted on Sep 27, 2013

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You have a bad ground on that side... find where the ground attaches to the frame... unscrew the connect... clean it up with abit of sandpaper and reattach it... you should be good to go on that

Posted on Jan 03, 2009

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