[SCOTI]

Instead of taking it off the truck to bench bleed, simply unbolt the brake lines from the master cyl, then install the bleeding plugs & submerge the lines into the mstr.cyl. & slowly pump the brake pedal until no air bubbles are seen.

Hook the lines back up & re-bleed the system. When I was having trouble w/mine, I went & got 4 clear bottles (1 for each wheel cylinder/caliper) & put a small length of vac line on each bleeder screw. This way I never allowed any air in the vacuum lines (since I left them in place while moving from farthest to closest) & I could monitor the bleeding results better.

Also FWIW, I always have my lovely assistant pump the pedal down until she reaches the end of travel & hold it there until I let her know I've got the bleeder screw fully opened/closed, then she slowly lets it all the way up. I don't pump the brakes more than once. I do each corner 3 seperate times before moving to the next, & refill the mstr.cyl. fluid level after each corner . I used a full qt. of fluid before getting all the air out of my 74.