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New drums and rotors are essencially bare metal because it allows for the most desirable characteristics for braking. Heat diffusion and friction surface and microsurface. When stored before sale, they are often coated with a film and sealed in plastic, before installing, they are removed and cleaned, so once put in to use, they will develop thin rust rather quickly.

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Q: Are new brake drums supposed to be rusty just had new brake drums put on van less than 1 month ago and they are rusty?
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