There are no brake "bands" in there. No "brake cylinder" either. Just a big round piston.
Are you sure it's the brakes locking up? Did you check the big center-bolt in the final drive and make sure it's not backing out? It has a triangle-shaped lock-plate driven over it. That plate sometimes works loose and then that bolt starts backing out.
What did your brake linings look like when you had it apart?