Hi. I am installing a new brake master cylinder on my 72 240. Is there anyway to bleed it prior to installation so that I don't have to re bleed the entire system? Thanks. Bill.

New master cylinders should be bench bled first, to get the bulk of the air out of the master cylinder itself. But you will still need to bleed the rest of the system once you get it on the car, to remove the air that was introduced when the metal lines were connected to the new cylinder.