See also:

Malfunction
In the event of a failure or malfunction of the parking brake, secure the vehicle against rolling using a wheel chock, for example, when leaving it. ...

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

Operating from the outside
▷ Via the remote control. ▷ Via the door lock. ▷ In cars with Comfort Access, via the door handles. The following takes place simultaneously when locking/unlocking the vehicle ...