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. ...
Service and warranty
We recommend that you read this publication
thoroughly. Your vehicle is covered by the following
warranties:
▷ New Vehicle Limited Warranty.
▷ Rust Perforation Limited Warranty.
...
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, ...
