Quote:
Originally Posted by apecush
you left your car for way too long without driving it in a corrosive atmosphere and your brakes rusted. a lot. simple as that.
replace rotors, pads, and fluid.
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No, rust has got nothing to do with it - rust on the friction ring of the discs gets rubbed off when brake pads make contact; it's the discs that have worn below the specified minimum thickness, which is the main problem. Pads should otherwise be fine as they still have a decent amount of pad material left and can be properly bedded in with a new set of discs. Brake fluid level and condition will definitely need to be checked.
I regularly do pad swaps, thickness measurements and fluid changes for each track day, so I'm very familiar with the brakes of the M3.