[frankym]

the bore on the slave is 7/8 (.88 inches) and the master looks like a girling and is either 3/4 or 7/8 but I don't think the size is the problem because the stroke of the pedal is farely long which is genearlly associated with a smaller master bore; going to a larger bore at the master (relative to the bore at the wheel cylinders or in my case the slave) would give me a shorter stroke and require more pedal effort, since I have good travel and hard pressure, I think the problem would be unrelated to a bore size mismatch, but I am NO expert so I am really not sure.