Maybe you have some aged dacromat coating that is discoloring. The dacromat finish when new is nearly silver in color. On the SVT, the front and rear rotors ans well as front and rear calipers are dacromat treated. There should be no discoloration on the face of the rotor though since the dacromate would have worn off from normal braking within two or three thousand miles.
If the discoloration is on the face of the rotor then I don't know why unless it is something from the pads.
Congratulations on your newly aquired SVT.
Jim Johnson
98 SVT
