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

See also:
2009 BMW X3 Review
There is very little about the 2009 BMW X3 that hasn't already been covered
by Cars.com; the 2007 model that Kelsey Mays reviewed is essentially the same
vehicle that's offered for 2009. What has ...
Airbags
Airbags
1 Front airbags
2 Head airbags
3 Side airbags ...
Sound output
Switching on/off
When the ignition is switched off: press ON/OFF
button on the radio.
Muting
When the ignition is switched on or the engine
is running: press the ON/OFF button on the
radio. ...
