As I pulled from a stop, into an intersection, the car slammed on the brakes with no warning. Did not see the normal ‘BRAKE’ message as usually appears if you follow to closely for example and there was no car in front of me. It was a quick slam of the brakes, which threw my head forward and down suddenly, then released. I Continued driving and saw no warning lights or indication of a problem on the dashboard. However, when I parked the car and turned the engine off, it would not restart. Only clicked and displayed a continuous series of error messages on the dash including ‘Electronic Break System Failure’ and others. The car would not start. I tried to start it multiple times until the battery eventually ran down. Called tow service and they jump started the car. All error messages reset and did not reappear. I only drove it short distance home and have not driven it since.