another brake issue

[cheyenne10]

I guess we can spend a lot of time on brakes, the single most important part of truck!! Truck is 71 C20 2 wheeler with PDB.

I installed a new/rebuilt booster, prop valve and master cyl. I bench bled the master and installed the rest. I now go to bleed standard sequence and I keep checking master and front reservior is overflowing (brake fluid on my new parts,..........sob, sob) Anyway continue to struggle with this and same thing over and over. Front calipers have bleeder ontop of caliper so hard to get to and getting messy under there too. Doesn't seem to have volume of fluid expected coming our of bleeders in front. Work and work on it and end up calling it a night. Take for drive and all feels well. I am still uncomfortable with what I saw. Very dirty fluid coming out and strange symptom where front reservior seems fuller than when filled.

Is fluid passing from front to backc reserviors?
What have I done wrong? I opened the bleeder on prop valve 1st and then did all 4 brakes twice.

Is there special sequence for prop valve and master cyl. bleeding on truck? I will need to eventaully get to rebuild all brakes at wheels, just hoping to get it driveable for next 2 weeks.