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

See also:
Switching the system on/off
Press the left or right side of
the button
on the CD/DVD player in the rear for the
respective page.
Rear entertainment and screens are switched
on/off.
After switching off the ignition, th ...
On-demand control of ancillary units saves energy
Intelligent energy management in the new BMW 3-Series is further enhanced by
the ancillary units, which consume significantly less energy compared with
conventional systems. Examples include the o ...
Active seat ventilation, front
The seat cushion and backrest surfaces are
cooled by means of integrated fans.
The ventilation rapidly cools the seat, e. g., if the
vehicle interior is overheated or for continuous
cooling at ...
