See also:

The concept
HDC is a downhill driving assistant that automatically controls vehicle speed on steep downhill gradients. Without requiring brake application, the vehicle moves at slightly more than twice wa ...

Switching on automatically
With the engine running or the ignition switched on, shift the selector lever into position R. ...

Dimensions
Coupe All dimensions given in inches/mm. Smallest turning circle dia.: 35.1 ft/10.7 m 135i: height 55.4 in/1,408 mm Convertible All dimensions given in inches/mm. Smallest turning circle dia.: 35 ...