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Old 03-19-2003, 09:08 PM
Kestas Kestas is offline
I told you so!
 
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,791
Discoloration from heat is anywhere from straw to black. The stages are: light straw-straw-purple-blue-black. Brown is hydrated iron oxide. I think you're looking at rust.

Does the car sit idle for long periods? Brakes suffer first on a car that sits unused. If the shiny metal doesn't come back on the rotor surfaces after running it for a couple weeks, then check into the possibility you may have a seized caliper.
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