The six piston calipers that look like a big brake kit are horribly made. They can't stand up for much abuse and are failing miserably on the track. I have a 135 and wish soooooo badly that they would have come with the single piston brakes found on most BMW's. My pistons are already crumbling after only four DE events. Stick with the single piston or buy a true BBK.
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