69 300, hard brakes; booster and valve question

I'm gently reviving a 69 300 and it's responding well. That said, the brakes are hard to press when moving the car around the driveway and in and out of the garage (no dragging, grinding or other weirdness, just needs a real hard press) and I need to get this sorted before I do anything more. The car has drums front and back and has a power booster. I've been reading about the booster and check valve and I have a couple questions;

The car is very stock, like crazy un-touched, but I see...

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Author: potshot