Power Disc conversion/ proportioning valve question

I did go back twice on Saturday and re-bleed the brakes in that order making sure the reservoir stayed full, still having the same issue. Ordered a new prop. valve from Inline Tube and will swap it out once it arrives. In the meantime on to changing the transmission tail shaft seal (glad I remembered to drain the trans fluid first).
No shortage of excitement at your place. I've had to replace the tail-shaft bushing while chasing down driveshaft chatter at highway speeds under coast conditions. That was interesting, because I bought a tool to do it with the seal removed but trans intact. It worked.