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If you look around at a few different threads you'll find that the BMW pistons are ceramic and overheat when pushed hard. They also break down and need to be replaced. One mod that guys have done is replace them with 3 series brakes (gray or blue) brembos. Other option is big brake kits.
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2011 135i w/ DCT | ZSP Sport Pkg | PPK | Ohlins R
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