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

See also:
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 available in a vehicle, ...
Locking and unlocking
Pressing the buttons locks and unlocks the
doors and the tailgate when the front doors are
closed, but they are not secured against theft.
The fuel filler flap remains unlocked. ...
Removing: Electrical* head restraints
Note
Do not remove the rear head restraints.
To avoid damage, they can only be installed by
your service center.
Removing
Only remove the head restraint if no one will be
sitting in the seat ...
