See also:

Deactivating HDC
Press the button again; the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

Switching on/off
Press the button. ...

Putting into operation after a power failure
Putting the parking brake into operation The parking brake should only be put into operation again if it was manually released due to an interruption in the supply of electrical power. Otherw ...