[mhughett]

Originally Posted by Finnegan

I have no idea why this is happening, but on our cars we have no "judder" and that's after a few track days.

Just thinking out loud, some possibilities:

Hub, as noted by Swanic
Calipers--applying even pressure both sides?
Calipers--sticking?

Some of the above seem unlikely given we have floating rotors. I'll leave the definitive answers/ideas to folks here who are much more technically saavy than I.

I took both sides apart last week looking for irregularities, including removing and cleaning both rotors and found nothing out of the ordinary. The caliper pins were lubed and there was no evidence of sticking. Given that the calipers float, it's unlikely to be a sticking problem if they move along the pins. I'll certainly let you know what they finally come back with. Since the technical rep will be involved and they can see the history of prior repairs, I hope he digs a little deeper this time.