Question about 2005 Audi A4

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Audi A4 tail lights come on at night and drain my battery

I have a 2005 Audi A4 and sometimes at night my tail lights come on and this causes the battery to drain.  Is there a quick fix for this? Thanks!

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Its the sensor in the brake pedal, happens mostly at cold nights since cold weather loosens up the pedal it causes the pedal to go down by itself if like you were braking, I used to roll up the matt and put it underneath the pedal and that would put pressure upwards while i was researching on how to do it myself found out is complicated and decided to take it to the mechanic for a 200$ fix.

Posted on Jan 25, 2010

  • shanestewar Jun 08, 2011

    i have the same problem with my audi,will try that tonight,hopefully it cures it until..thanks..

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Have the same problem. It is the brake light switch that is faulty or broken.

Posted on Jan 03, 2010

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Will try putting a shim under the brake pedal but speculate that the computer is sending a wrong signal to the brake light. Thanks.

Posted on Nov 04, 2013

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I AM LOOKING AT A FAULTY LIGHT SWITCH.

Posted on Nov 13, 2009

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1 Answer

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SOUND LIKE YOU HAVE FAULTY BRAKE LIGHT SWITCH.

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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.

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HI there,

I had the same problem with mine. Managed to determine that it was the rear brake light switch that caused a short. This meant that once the car was turned off power was being drained. We thought it might be the computer module shutting down which can take up to 10/30 minutes. But No. Replaced with a new Brake Light Switch, Problem Solved

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