1965 Valiant low brake pressure

First off, my last post said something about a mod needing to see it before it would post, im not sure why its doing that.

The first replacement MC worked right till the wheel cylinder went out and since then I havent got the pressure back. So I assume its the correct one. Which makes me wonder if theres something wrong with the WC's but they are pretty basic and that I know of if theres no fluid coming out of them and they do move when you press the barkes theres nothing else to be wrong with them. Other than wrong size which im 99% sure they are correct.