Instruction book Audi RS5 Version year 2014
 Audi RS 5   Setting off   Automatic gearbox  S tronic
The downhill speed control function helps the driver when driving down steep gradients.
Downhill speed control is activated on a downhill gradient when the selector lever is in D/S and the driver presses the brake pedal. The S tronic gearbox automatically selects 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 limitations of the power train). It may be necessary to adjust the speed again using the brake pedal.
Downhill speed control is deactivated as soon as the road levels out again or you press the accelerator pedal.
On vehicles with cruise control system* Link, downhill speed control is activated when you set a cruising speed.
WARNING!
The downhill speed control function cannot defy the laws of physics and may therefore not be able to maintain a constant speed in certain circumstances. Always be prepared to use the brakes!

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