I changed to a larger bore MC on mine some time back, but not with huck brakes. I didn't notice any change in pedal pressure, but it did stop better. Having said that, I should add I rebuilt all the wheel cylinders and changed shoes, springs, etc at the same time. So it is hard to say if the MC was 100% the cause of the better stopping. About two years ago Rock Auto was offering the larger bore MC on a close out deal. I think they were $14 or $15, so I bought one for future use.
Jon
