Bench bled and installed an original rebuilt M/C, installed two new (AC Delco) rear wheel cylinders, brake shoes and brake lines. Bled rear brakes 2x each 'till all bubbles were gone and could see good fluid movement thru the hose, but the brakes are not working. I pulled the drum off and had my son press the pedal—nothing happens, the rear shoes don't move at all. I then bled right front caliper, and was going to bleed left front until I but ran into an immovable bleeder screw so I am stuck for right now. But that shouldn't affect the rear brakes, should it? I thought this would be "easier." I should know better by now. Anyone have a suggestion? Thanks.