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

See also:
Deactivating/activating DTC Dynamic
Traction Control
The system can be deactivated/activated via the
TRACTION and SPORT+ programs of the Dynamic
Driving Control. ...
Driving on poor roads
Your vehicle combines an all-wheel drive system
with the advantages of a normal passenger
car.
Do not drive on unpaved terrain
Do not drive on unpaved terrain, as otherwise
the vehicle may ...
Opening/closing the glass sunroof
When the sliding visor is open, proceed as described
under Sliding visor. ...
