The parking brake failed with an amber indicator showing on the dashboard when starting the car. Had to put the car in gear (6sp) and then get out and chock the wheels in order to keep the vehicle from rolling down hill. Independant repair station informed me there was an error code - 6017 wheel speed sensor dfa_emf in the parking brake module. This error is in fact a bug in the software and required a new verion of code to be loaded at the BMW dealer for a cost of $430. BMW has been aware of this problem since at least 2013 and has not issued a notice or recall. This issue affecting hundreds of bmws needs to be invesigated due to the obvious saftey concerns.

- Winston Salem, NC, USA

The contact owns a 2011 BMW Z4. While driving 35 mph, the brake pedal was depressed, but it failed to stop the vehicle. The emergency brake was engaged in order to stop the vehicle. The vehicle was taken to BMW of asheville (649 new airport rd, fletcher, nc 28732, (828) 681-9900) where it was diagnosed that the brake booster needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 36,000.

- Lincolnton, NC, USA

When exiting a parking lot into a city street, when the brakes where pressed, a loud pop noise was heard, then a hissing noise and the brake pedal sank to the floor. There was no braking power after that and my car rolled into the street out of control, it was a scary situation but no accident or collision ocurred at this time. To stop the car the brake pedal had to be pressed very hard all the way to the floor, there was no leakeage of brake fluid. The BMW dealership diagnosed a faulty brake booster.

- Little Elm, TX, USA

The incident occurred in auburn, ca. We had just finished lunch and were planning to head home. I placed my foot on the brake pedal to start the car and we heard a distinct popping noise. As I engaged the transmission and started to move forward I immediately realized the BMW had lost its braking ability. I was able to slow the car and re-park the vehicle. We had the vehicle flat bedded back to the dealership in sacramento, ca. The dealer took a week to repair it and when I retrieved the car the repair representative told me that the power assist and master cylinder had failed and been replaced. Recently I checked the internet for other similar incidents with bmws and found that BMW has been doing a "voluntary" recall on 2012S and 2013S. BMW has not yet issued a recall for 2011 models to my knowledge. I feel strongly that the NHTSA should require BMW to immediately initiate a mandatory recall on all bmws that have a similar braking system. If we had been traveling at speed there would most likely have been an accident and possible injury. If it had been on the freeway at highway speed we hate to think what might have happened. These vehicles are unsafe and should be removed from the road as soon as possible.

- Sacramento, CA, USA

The contact owns a 2011 BMW Z4. The contact stated that while driving 30 mph, the vehicle began to shake violently. The contact applied the brakes but the vehicle did not decelerate. The contact maneuvered the vehicle to crash into a curb in order to get it to stop. The contact was not injured. The vehicle was towed to a dealer for diagnosis but the contact was not informed of what caused the shaking or braking failure. The manufacturer was notified of the failure. The vehicle was repaired. The failure and current mileage was 33,000.

- Yonkers, NY, USA