The concept
The parking brake is primarily intended to prevent the vehicle from rolling while parked; it brakes the rear wheels.

See also:
Vehicle information
Owner's Manual
Computer
Vehicle
...
Parts and accessories
For your own safety, use genuine parts and accessories
approved by BMW. When you purchase
accessories tested and approved by
BMW and Genuine BMW Parts, you simultaneously
acquire the assurance ...
CBC Cornering Brake Control
When braking during curves or when braking
during a lane change, driving stability and steering
response are improved further. ...
