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

See also:
Radar sensors
The radar sensors are located under the rear
bumper.
The system may not be fully functional in the
following situations:
▷ Dirty or icy bumper.
▷ Stickers on the bumper.
A Check ...
Safety information
The tire characteristics and tire inflation pressure
influence the following:
The service life of the tires.
Road safety.
Driving comfort.
...
Switching on/off manually
Press the button.
On: the LED lights up.
Off: the LED goes out.
...
