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7. Before '68, the residual check valve was in the cylinder bore, and disassembly was required for its removal. Since '68, the check valves (two assemblies at bottom of photo) are in the outlet ports behind the visible (brass) inverted flare seats for the brake lines, and can easily be removed with a small screw, shown in one of the inverted brass flares.
8. The deep push rod hole on the right is for manual brake installations, while the left shallow hole works with power boosters. Be sure to check this when buying a new master cylinder.
9. This close-up view shows the pre- '68 residual check valve on the left, and the post- '68 check valve, center. The screw goes into the inverted brass seat for removal, then the rubber "duck bill" pulls out the back of the brass flare. Some rebuild kits include the screw so the master cylinder can be used for either disc or drum applications.
10. This drawing should give you an idea how different size wheel cylinders and caliper pistons create pressure in the system, with a one-inch diameter bore master cylinder (A). Drawing D could be seen as a caliper piston, while B and C could be seen as wheel cylinders. |
