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

See also:
Maintaining/storing the speed
Press the button*.
When the system is switched on, the current
speed is maintained and stored as the desired
speed.
It is displayed in the speedometer and briefly
displayed in the instrument ...
Maintenance
Maintain the vehicle regularly to sustain the road
safety, operational reliability and the New Vehicle
Limited Warranty.
Specifications for required maintenance measures:
▷ BMW Maintenance ...
The concept
This system reduces undesirable vehicle motion
when using a dynamic driving style or traveling
on uneven road surfaces.
The system enhances driving dynamics and
comfort as required for the road ...
