Just to avoid confusion, I run an Evo 5 with the standard setup (Brembos). Quite a few people at the Ring took a look at the brakes, me and StevenRW had the pads out in the morning, and like I say, when cold to warm they are fine - good braking, no judder.

But once warmed up, they start juddering - and not just a little! You cannot hold the wheel straight, and braking power is about halved.

The strange creaking sound was witnessed by many people on the forum, and very slight flex during braking can be felt, which obviously should not happen with 4-pots. A few suggestions were the shims on the back of the pads, or the calipers themselves creaking. It was certainly something that noone had experienced before.

The difference in the face of the front disc is still noticable, I'll take a picture.

Apparently this is a known problem on the V and VI, which is why everyone is looking for a solution to the judder. If you read the MLR post, you'll see that PF themselfes had rotors sent back due to juddering, only to find they were fine.

So, the brake juddering must be coming from elsewhere - in my case I suspect the calipers. I can't see any other part of the system which would cause the problem, only when warm - but if you have any suggestions, I'd be glad to hear them and will investigate further.