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 walking speed.

You can activate the Hill Descent Control at speeds below approx. 22 mph/35 km/h. When driving downhill, the vehicle reduces its speed to approx. twice walking speed and then keeps its speed constant.

While you are actively braking, the system is on standby. The system does not brake the vehicle during this time.

    See also:

    Weights
    The values preceding the slash apply to vehicles with manual transmission; the values following the slash apply to vehicles with automatic transmission. ...

    Setting manually
    Setting manually Pull the button. The parking brake is set. The indicator lamp lights up in red. The parking brake is set. Indicator lamp in Canadian modelsTo set the parking brake, the r ...

    Switching on/off manually
    Press the button. On: the LED lights up. Off: the LED goes out. The PDC is shown on the Control Display. Switch on the backup camera via the iDrive. ...