The problem has been traced to restricted oil supply from the intake camshaft to the brake vacuum pump, which may cause the brake vacuum pump to fail, resulting in a loss of power brake assist. While the hydraulic brakes will still function, the driver must much apply greater pedal pressure and the distance required to stop the vehicle will increase.
BMW has reported three minor accidents with no confirmed injuries. According to Bimmerfest, drivers who encounter a braking problem should "pull the emergency brake and apply as much brake pedal pressure as possible. If your BMW has an electronic parking brake pull up and hold the switch to engage the brake." Drivers should then park in a safe location and contact BMW Roadside Assistance.
While a repair is not yet available and we have yet to see any official notice from NHTSA, BMW will begin notifying owners of the recall in November. Repairs will be performed free of charge.
The affected models, as reported by Bimmerfest, are:
- 2012-14 320i/328i, 320i/328i xDrive Sedan manufactured between May 2012 – August 2013
- 2014 328i xDrive Sports Wagon manufactured between March 2013 – May 2013
- 2012-13 528i, 528i xDrive Sedan manufactured between June 2012 – June 2013
- 2013-14 X1 sDrive28i, X1 xDrive28i manufactured between June 2012 – June 2013
- 2013-14 X3 xDrive28i manufactured between June 2012 – August 2013
- 2012-14 Z4 sDrive28i manufactured between June 2012 – June 2013