The concept
HDC is a downhill driving assistant that automatically controls vehicle speed on steep downhill gradients. The vehicle moves at approximately walking speed without braking intervention by the driver.
You can activate the Hill Descent Control at speeds below approx. 22 mph/35 km/h. When moving downhill at speeds below approx.
22 mph/35 km/h, the vehicle reduces its speed to approximately walking speed, approx. 5 mph/ 8 km/h and keeps it constant.
Only use HDC in transmission positions D or R.
See also:
Interior motion sensor
The windows and glass sunroof must be closed
for the system to function properly. ...
System limits
Sudden tire damage
Sudden serious tire damage caused by
external influences cannot be indicated in advance.◀
A natural, even pressure loss in all four tires cannot
be detected. Therefore ...
The Appendage Factor
M cars have had what I call a high appendage factor — the feeling that the
car is an extension of the driver. It's typically experienced in cars whose
various systems and characteristics are well- ...