Do you mean it brakes when it speeds up because the road is downhill or when supplementing the throttle yourself?
It is an angle sensor that downshifts at the start of hills or when descending, it also does something with the EPB release on a hill too.
This can also stop you retracting the pistons on the rear brakes to change the pads as I found out when on axle stands on my sloping driveway. It said "conditions not met" or suchlike in VCDS, took a while to figure out.
Last edited by snapdragon; 13th May 2014 at 12:33 PM.
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