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

See also:
Check the tire inflation
pressure regularly
Check and, if necessary, correct the tire inflation
pressure at least twice a month and before starting
on a long trip.
Low tire inflation pressure increases rolling resistance
and thus raises ...
Navigation system
General informationThe navigation system can determine the precise position of the vehicle, with
the aid of satellites and vehicle sensors, and can reliably guide you to every entered
destination. ...
Performance
For 2009, there's just one engine: a 3.0-liter six-cylinder that's good for
260 horsepower. It teams with either a six-speed manual or a six-speed automatic
transmission. All X3s have all-wheel dr ...
