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
...
Buttons at a glance
Buttons at a glance
1 System on/off, interrupt
2 Resume speed
3 Store speed
4 Reduce distance
5 Store, maintain/change speed
6 Increase distance ...
BMW Maintenance System
The maintenance system directs you to required
maintenance measures and thereby supports
you in maintaining road safety and the operational
reliability of the vehicle. ...