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

See also:
Deactivating HDC
Press the button again and the
LED goes
out. HDC is automatically deactivated
above approx. 37 mph/60 km/h. ...
Ignition on
Press the Start/Stop button, and do not press on
the brake pedal at the same time.
All vehicle systems are ready for operation.
Most of the indicator and warning lamps in the
instrument cluster ...
Display
The following is displayed in the instrument
cluster.
Speed limit detection
▷ Current speed limit.
▷ No speed limit - for the German
autobahn.
▷ Speed limit detection is no ...
