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The increase in the piston surface area over stock means we needed a smaller-diameter master cylinder to create the same brake pressure. A new master cylinder from CPP brought the cylinder diameter down from 1 1/8 inches to 15/16 inches. There is a slight difference in pedal feel, with the new CPP unit exhibiting a longer, smoother stroke with better modulation. The new CPP master cylinder (PN 6150012, $115) is a direct swap for the stock unit.