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Rear Brake Rotor Corrosion

Brakes

Model: 968, Year:1995, Mileage:115000, Type of use:Street use only
I'm looking at a 1995 968 resale with 115,000 miles. The rear brake rotors look corroded, like any disc brake car that is not driven for a few days or more. The fronts are smooth and shiny. I have driven the car in traffic for about 10 miles, and applied strong braking pressure, and I believe that if the rear brakes were working properly that they would "shine up" rather quickly. Am I right that the rear brakes are not working correctly? Does the 968 have a proportioning valve that might be stuck? Could both rear calipers be jammed or rusted in place? Could the pads be glazed in a way that fails to clean the rotors while braking? I believe there is a problem, which the seller fails to recognize.

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