Downhill speed control is activated on a downhill gradient when the selector lever is in D or S and the driver applies the foot brake. The S tronic gearbox automatically changes down to a suitable gear for the gradient. The downhill speed control function attempts to maintain the speed at which the vehicle was travelling when the foot brake was applied (subject to the laws of physics and technical drive limitations). It may be necessary to adjust the speed again using the foot brake.
The system can only be switched on when driving below approx. 60 km/h. The driving speed is controlled to between 4 and 30 km/h. On vehicles with a manual gearbox, the downhill assist function will only maintain the speed at levels below approx. 9 km/h if you keep your foot on the clutch or select neutral gear. If you release the clutch with the vehicle in gear at a speed of less than approx. 9 km/h, the target speed will be increased. You can increase or reduce the speed within this range anytime by pressing the accelerator or brake pedal.