The '84-89 Carreras use a thicker rotor than earlier versions 24mm vs 20mm, the thicker rotor will hold up better than the thinner variety. I don't remember seeing Brembo 20 or 24 mm rotors for 911s, could be wrong though(George,you have 20 or 24mm Brembos?). The most common are Zimmerman and ATE, both were oem suppliers. Yes, race pads will tear up rotors faster than street pads, and they will thermally stress the rotors to a greater extent, that is why you need cooling and change them out for street use. The ultimate solution is the 930/964/993 setup. the street pads on the other hand will glaze easily giving you almost no brakes hot or cold. Choose your poison
