Hope this will help someone. I just got a early 71 240 z thats been setting in the garage since 1979. The break master cylinder was seized. I couldent get the pistons and springs out for the life of me.. Here is how i got them out - take out all the bleader screws get a big botttle of pine-sol and boil them for a couple hours.. then hit the bottom of the cylinder on some wood they will come out..