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And you don't really get more stopping power with more pistons in the caliper. There's only so much pressure a caliper can generate, and the pistons are generally smaller the more of them there are. More pistons apply a similar pressure over a larger area compared to a caliper with fewer pistons over a smaller area. The purpose of the larger pad is to increase heat capacity and reduce fade.
Higher friction pads and larger rotors do more do decrease stopping distance than more pistons in the caliper.
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