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May I jump in out of curiosity because I am puzzled SImon? Why the concern over a lack of MOT, lack of cat, and modified suspension if it is to be a track car? I assume none of those things are relevant for off road use, and you would in any case modify or alter the car to meet whatever regulations are in force for the class of racing you intend.

I think the genuine Audi discs are poor quality. They shouldn’t be wearing like this. I’ll try and find someone local to me who can resurface them on a lathe properly as they’re off the car. Then install them in about another 10k miles. There will be enough in the discs for another ~40-50k miles imho.

Hi nice picture and you obviously have the right kit for the measuring, I used to have a friend that was an instructor for the Nigel Mansell racing school at Sneterton so I had the privilege of spending a lot of weekends there and learnt a lot, what you have is classic wear caused by basically what is a track car set up on a road car, this system is essential on high performance road cars such as Ferrari etc that are running over 400bhp, you could have the discs skimmed but I think you would achieve bottom limit before they cleaned up, my theory for what its worth is if I used genuine discs and pads on my A6 they never lasted that long but the reverse is if I bought ATE high carbon discs and used Brembo pads I got at least a third more wear out of the discs and pads and on a cab thats not bad going, I think on later vehicle Audi have probably done the cost cutting thing with the carbon content for the discs, lets face it they would do this just save money. Steve.

Could this be related to your previous question from two years ago, and which you did not respond to the suggestion made at that time? https://www.audiownersclub.com/forums/topic/27669-key-fob-issue-now-no-light-on-dash-engine-turns-over/#comment-109201

It’s great when vital details are not mentioned until the 11th hour! Such detail would save contributor’s coming up with irrelevant - but what they think are meaningful - comments. There we are then? Regards, Gareth.

Apologies for jumping in on this, but from a simplistic viewpoint, if you agree the noise originates from the area of the clutch, then the assembly has to be dismantled for inspection with a minimum of delay. Failure to do this could result in catastrophic failure. The running issue is probably not connected, but please bear in mind that no one on here has access to inspect what you describe. Regards, Gareth. Post overlapped with Cliff’s reply.