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

See also:
Switching off automatically
The system switches off and the LED goes out:
▷ After approx. 165 ft/50 m when driving forward.
▷ After approx. 22 mph/35 km/h when driving
forward.
Switch on the system again if nece ...
Upholstery material care
Vacuum regularly with a vacuum cleaner.
If they are very dirty, e.g., beverage stains, use a
soft sponge or microfiber cloth with a suitable
interior cleaner.
Clean the upholstery down to the se ...
Switching on/off manually
Press the button.
On: the LED lights up.
Off: the LED goes out.
...
