I'm no pro but I'll see if I can jar some thoughts. If you have drum brakes did you adjust the brake shoes good? If you don't have them tighten enough you may not have pressure against the drum. You have to run the shoes up until you have good resistance when you rotate the wheel.
That would be my start.
I would usually get them close that way and then back the car up a few times and let the self adjusters finish it.
