See also:

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

Applying
The lever automatically engages after being pulled up. ...

Releasing
Press the switch while the brake pedal is pressed or transmission position P is engaged. The LED and indicator lamp go out. The parking brake is released. Take the remote control with you Ta ...