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

See also:
Open trunk lid with no-touch activation
With Comfort Access, the trunk lid can be
opened with no-touch activation using the remote
control you are carrying.
A sensor detects a directed foot motion in the
center of the area at the rea ...
Requirements
Via the Control Display, set a language that is
also supported by the voice activation system
so that the spoken commands can be identified.
Set the language ...
For US customers
The following only applies to vehicles owned
and operated in the US.
If you believe that your vehicle has a defect
which could cause a crash or could cause injury
or death, you should immediate ...
