7. The deep pushrod hole on the right is for manual pushrods, while the left shallow hole works with power boosters. Be sure and check this when buying a new master cylinder.
8. This close-up view shows the pre-'68, residual check valve on the left, and the post-'67 version in the center. The screw goes into the inverted seat for removal, then the rubber "duck bill" pulls out of the back of it. Some rebuild kits include the screw, so the master cylinder can be used for either disc or drum applications.
9. It was actually a very simple swap, since both mounting holes are in the same spot. This is a right-hand exit port application used backwards, the reason why both right and-left exit ports are offered.
10. This drawing should give you an idea of how different sized wheel cylinders and caliper pistons create pressure in the system, with a one-inch bore master cylinder (A). Drawing (D) could be seen as a caliper piston, while (B) and (C) could be seen as wheel cylinders.
11. Power brake bleeders can offer a lot of pressure and should be operated by a professional brake man that knows the correct pressure for your system. The basic system (air over fluid) operates with a head of adjustable air pressure on the tank, which is filled with brake fluid. The air line from the tank is connected to a special cover that can be tightened to the master cylinder. This provides pressurized fluid to the system.