1. Switch on the ignition.
2. Press the reel while stepping on the brake pedal or selector lever position P is set.
It may take several seconds for the brake to be put into operation. Any sounds associated with this are normal.
The indicator lamp in the instrument cluster goes out as soon as the parking brake is ready for operation.
BMW X3 Owners Manual > HDC Hill Descent Control: Increasing or decreasing vehicle speed
Specify desired speed in the range from approx.
4 mph/6 km/h to approx. 15 mph/25 km/h
using the rocker switch of the cruise control on
the steering wheel. Vehicle speed can be
changed by lightly accelerating.
Press the rocker switch up to the point of
resistance: the speed increases ...