Porportional valve adjustment no pressure to rear cyl

[Furno68C20]

Update! After hours of diagnosis and nothing making sense I’ve finally have a solution to this brake issue. Recap, i orders a front disc conversion kit from Brothers Truck. In addition to the conversion I updated the master cylinder and booster. After everything was installed I had trouble bleeding the new disc (front) original drums. The first issue was in the MC. Apparently the master cylinder I received was from a BAD casting batch from brother’s supplier. The lines connecting the MC to the porportioning valve leaked. Not a NPT Tap on the master. Contacted Brother’s about problem and they sent me a new MC. Swapped new MC and no leaks but now still not getting presssure to the rear. OMG. I then took apart every brake fitting from the front to rear. After hours of testing lines with compressed air I narrowed down to the single brake hose to the rear being clogged. Of course the last section of brake to check is the problem. Replaced rear brake hose with a 23” line from a suburban. Bleed system and now getting rear circuit to work. Hope this helps the next guy.

Thanks for all your help guys.
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