Whats the purpose of having a big piston and a small piston in a caliper (staggered pistons)?
Multi-piston calipers, normally with six or more pistons, have bore sizes that increase in size from front to rear. This allows a pressure differential between the leading and trailing edge of the caliper, thus providing an even wear pattern along the entire length of the brake pad, hence it controls brake taper. This is necessary because incandescent material and debris from the leading edge of the pad is trapped between the pad and rotor; it tends to float the trailing edge of the pad off the rotor. A larger piston at the trailing edge of the pad provides more pressure to compensate for this debris buildup and keep the pad flat against the rotor.
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