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The guy had the car out on the track with stock BMW brake pads. He overheated the brakes, and BAM, this is what happens; the brakes literally start to crumble away. Proof that even though your ///M car may be built around the track, it doesn't come off the showroom floor to go on the track.
Funny part is that in the owners manual it even says to have the car inspected before and after taking it to the track and also recommends different pads for the track as well. This is the second time I have seen this in just a few months!