On a side note:
The valve is back in the truck without the o-ring and have a new master cylinder and booster.
Starting bleeding tonight and finally got fluid to my back brakes.
Couldn't get it to bleed with zero air in rear right so I switched over to the driver side rear and starting.ed bleeding some there and found a leak in a fitting from a soft line to a hard line in the rear. Probably was what started all this mess...

But it was 50 degrees and raining. Tomorrow's another day.

 

that sounds like progress. fix the leak there and i bet it'll be easy to get it back on its feet