My facelift S3 has the problem of leaving brake lights on, even when no one is near the brake pedal. If I switch the car off, the lights (including third brake) will stay on, not only is this annoying but it is also killing my battery. I can pump the brake pedal a few times and move the car a few feet and the brake lights will go off, but after a few minutes they're on again. Obviously, this is draining the battery, and it's getting very tedious now coming back to find that the car is in a coma. Any ideas what it could be?