BMW Questions? Ask a BMW Repair Expert for Answers.
Hello. If you lost brake lights on both sides it could be that your brake light switch is faulty. This is a switch at the brake pedal under the pedal that sends the signal to activate the rear brake lights. I would check the basics first and try a new bulb to make sure it is not in the bulb. If they still do not light then the next step would be the brake light switch. This switch is pretty difficult to replace and I recommend the dealer to install it. If should be no more than a 1 hour labor charge and should save you a lot of headache. Thank you. I hope this is helpful to you.