See also:

General information
Switch position: 0, If the driver door is opened with the ignition switched off, the exterior lighting is automatically switched off at these switch settings: ...

Safety
Neither the Insurance Institute for Highway Safety nor the National Highway Traffic Safety Administration has tested the 2007 X3. Standard safety features include four-wheel-disc antilock brakes, ...

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