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

See also:
Message from the Concierge service
Starting destination guidance
1. Select the desired message.
2.
"Start guidance" or "Add as another
destination"
3. Start destination guidance, if necessary.
Dialing ...
Wheels and tires
Vehicle equipment
All standard, country-specific and optional
equipment that is offered in the model series is
described in this chapter. Therefore, equipment
is also described that is not avai ...
Enabling operation in the rear
Only possible via the iDrive in the front.
1. "Settings"
2. "Allow rear control"
3. Select the desired priority.
...
