Yes, I appreciate it is normal for discs to rust, but although my front discs clear of rust as soon as I go on a short run, the rears do not appear to operate very often. Following a 6 mile drive and braking a number of times, the rear discs were still rusty with very few signs of it being removed. It would appear all the braking is concentrated on the front brakes, with very little if anything on the rears. I did brake very hard a couple of times, but it has made little difference. I understand long term rust left on a disc can cause issues with braking performance. With my last car, I could drive off with the handbrake gently applied on for a few yards and this would have cleared the problem, not an option with the new A3 and its electronic handbrake? Anyone else notice this? Any solutions?