Bleeding Brakes - 9" Drums

65 Dart
Manual brakes
Dual pot MC
9"drums at all four corners (our first 4-wheel drum brake vehicle)


I replaced the drums, shoes, cylinders, and hardware on all 4 wheels. Used a mighty vac for initial bleeding, and wife on the pedal me on the bleeder for the next two rounds (three pumps and a bleed). RR, LR, RF, LF on all efforts. MC never ran dry. Clean bubble free fluid at all 4 corners. Despite this, the pedal is spongy and does not begin to offer stopping power until about an inch off the floor. Pumping brakes builds negligible pressure.

So after reading 20 or so theads, a few folks have mentioned "adjusting the drums" - what does this mean?