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

See also:
Programs
The system offers two different programs.
The programs can be selected via Dynamic Driving
Control.
SPORT
Consistently sporty control of the shock absorbers
for greater driving agility.
SPORT+ ...
Radio
When the same radio source is selected in the
front and rear (e.g., FM/AM), the same radio station
is played.
Operation is the same as for the front radio. ...
Safety information
The tire characteristics and tire inflation pressure
influence the following:
The service life of the tires.
Road safety.
Driving comfort.
...
