Instruction book AUDI A1
 Audi A1   Controls   Automatic gearbox  S tronic® gearbox
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 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 Audi A1 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.
Downhill speed control is deactivated as soon as the road levels out again or you press the accelerator pedal.
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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