[joyridin']

I believe most of them came with GM rotors and Wilwood calipers. Are your cars set-up with twin master cylinders or a single cylinder? More than likely, it is the rear that are fading. Solid rotors tucked into the small space in the rear generate a lot of heat with nowhere to go. JH Engineering makes a kit for vented rear rotors, but it is not cheap by any means.