Wondering if anyone else has experienced this:
When heavy braking from v.high speed (on my own private motorway of course), say at the termination of a motorway, my brakes make a real grumbling noise. At first I thought it might be the ABS, but its way too noisy for that. I can feel the grumbling through the wheel and the brake pedal. What do you reckon it could be? Surely not ABS, I've experienced ABS\ TSC on this S3 and plenty of other cars and none are this "unrefined". Warped discs? Loose front suspension components somewhere?
It's odd, coz the brakes behave perfectly well elsewhere (although they could be better) such as normal driving, and even B road blasts. It just seems to happen on roads where you have a real head of speed up, and brake heavily in a straight line for a roundabout. I only had the car serviced in November, about 5k miles ago, and there were no reported problems with the discs or pad wear.
Any suggestions appreciated...