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Q: brake rotor on 1997 Ford Mustang

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
why my brake rotor is rusting in the inside surface?
both sides.only lasted 1 year ,and this is the second time.
(1) Answer
Do you mean the ventilated brake rotors are rusting in the center ventilation area or are the discs rusting on the in board side of the brake rotor? The brake pads "clean the rotors" as the brakes are applied. The center vent slots will have surface rust in the center any way. Normal brake application should keep the rotors clean.