Quote:
Originally Posted by mlhj83
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.
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taking your brakes below minimum thickness does not chew a rusty groove in the friction surface, nor does it corrode the chamfer around the drilled holes in the rotor. Mine are near minimum (thanks to track pads) and look absolutely nothing like that.