Quote:
Originally Posted by tpintas
Multi piston brake calipers work better because the pressure is distributed better along the brake pad; there is less tendency for the pad to "bend" in the middle. More of the pad pressing against the rotor = better braking.
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Ignoring the physics part of the question this pretty much sums up why multi piston calipers work heas better.
You'll also notice that each piston is a differant size. The leading edge of the pad grabs the hardest as it bends so its the smallest, the the last pistin is the largest as it has to overcome the bending force and then apply braking force on top of that.