Question about 2004 Audi A4

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Cold Weather causing the Left Rear Brake light to come on

When it is cold outside, the left, rear brake light will come on at some point during the night on my 2004 Audi A4 Quattro. This has killed the battery once, as it happens while I am asleep. I have checked the appropriate fuze, and all the rear lights still work.

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That's the most interesting problem I've heard all week. I'm pretty sure this has to be problem in the switch that operates the light. Are you positive it's the brake light and not just the tail light? Tail light switch is part of the headlight switch. If you're sure it's the brake light, replace the switch under the brake pedal arm, under your dash. I think this is the problem because unless the circuit is engaged at these switches, it's impossible to activate them from anywhere else. Brake switch is easy. You can do it your self. Headlight switch usually involves removing the steering wheel and is kind of a pain but not too overwhelming.

Posted on Nov 17, 2009

  • josephz Mar 06, 2011

    Similar thing happens to my 2005 A4 as well, the difference is that all three break lights come on. This only happens when the temperature gets below 40C, which is not that common for SF bay area, I ended up moving my car in the garage from the drive-way.

    The battery died twice because of this, very painful. Called the dealer, they said never heard of it! They told me that they couldn't do anything unless they can see the problem, but the lights go off when the temperature rise, which is when they open the door at 7:00am.



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