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

See also:
Compact Design
Just as BMW's compact 3 Series ranks below the midsize 5 Series, the
five-seat X3 sits in the shadow of the larger X5. The styling clearly says BMW,
but it's the multi-paneled look of earlier mode ...
General information
Two different driver's seat and exterior mirror
positions can be stored and retrieved for each
remote control. Settings for the backrest width
and lumbar support are not stored in memory. ...
Calling up the desired speed and distance
While driving
Press the button with the system
switched on.
In the following cases, the stored speed value is
deleted and cannot be called up again:
▷ When the system is switched off ...
