Originally Posted by WAY
I don't think the rear caliper is going to be an issue as it is the front brakes that does all the work.
The rears make that major chatter when actuating the E-LSD. People have asked me about it as I had driven by them on the track and at autocross.
Granted, the piston is bigger in back, I wouldn't rule out the rear, as it continually hammers the pad against the rotor.
If you're thinking this is heat related, my back calipers discolored long before my fronts did...
I'm thinking it's material related.