Does the A5/S5 have the automatic brake wiping system as found on the A8/A6? Can't recall reading about it anywhere. Was driving down the motorway in torrential rain and hadn't used the brakes for about 60 miles. Some fool pulled out in front of me and when I hit the brakes there was a momentary lack of bite - so I suspect there's no system keeping the pads/discs dry. Or is there?