Originally Posted by Bubbles
My bet is your Vacuum line with pressure sensor under the brake reservoir went bad. Are you hearing a constant buzz from the front left of the car? if so thats my guess.
Hey thanks for the reply but this was 1 year ago
Our first thought was the master cylinder connecter shorted because some brake fluid might have spilled (not leaked) during replacement. The dealer when through all the steps, even changing out all the parts in my car with another M3 and that didn't do anything. It was determined that the DME went bad so they took out the ECU, sent that to germany, and gave me a fresh one. Problem was solved.