Had my brand new S3 over a week now but I have noticed a knocking when I reverse and touch the brakes. It definitely comes from one of the front wheels (think driver side). It only does it once unless I move forward and then use the brakes again. Then next time I am in reverse I get the knock again on applying brake.
I am thinking possibly a loose caliper/pad?
Any ideas? Looks like it will be going back to the dealers again