Are the master brake cylinders on 4-piston front caliper the same as MBC's on single piston front calipers? I just replaced my MBC with one from a GXL that had 4-piston front calipers(I upgraded my front brakes to 4-piston over a year ago). After bleeding my brakes(several times), I still feel like there is a lot more free play in the pedal than I should have.