Why does my break light keep coming on and off while driving

You have damage to the front area brake system. It could be very serious but if car stops OK most likely not that serious you just won't have abs or traction control. The damage is most likely a speed sensor or something similar. I said it could be serious that is only worst case.
Here is a breakdown of what lights mean
ABS keeps your breaks from locking up
BREAK ASSIST helps your breaks
Traction control if you one wheels spin more than others system adjust wheel spiN

As simple as this answer is you may not believe that it is just the bulb. The problem is that you have a double filament bulb and when one filament breaks loose it will come into contact with the other filament causing the malfunction.

Check the brake switch. A Chilton book will tell you where it is.

It might be the parking brake warning - you may need to check the parking brake switch.

sounds like a short circuit

YOUR PARKING BREAK IS CAUSING THAT YOU NEED TO HAVE THELINE REPLACED

The tcs/abs and brake lights are all on the same warning circuit. First i would check the brake fluid level and make sure it is topped off, next i would have the problem codes read and see if it helps you pinpoint the issue. If the light sometimes come on and sometimes are off i would suspect connection problems in the wiring. hope this helps

there is a fault code in the ABS system need a code to help you further

I had the same problem with a 99 sable and it was the drive belt

does all break grab?? if so, the break master cyclinder need attention. if only one break grab then one of the break cyclinder need attention. the cyclinder is not backing off when the break is released.
do not keep driving the car if you don't fix the break. the car will lock up and going to cost you more.


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