See also:

Engaging the transmission position
▷ Transmission position P can only be disengaged if the engine is running and the brake pedal is pressed. ▷ With the vehicle stationary, press on the brake pedal before shifting out ...

BMW X6: rear seats
The head restraints in the rear cannot be adjusted and cannot be removed. ...

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. ...