Its possible the master cyl. pushrod is out of adjustment & not letting the piston come back all the way to relieve the pressure.
Also if the emergency brake cable is stuck or out of adjustment.
Have you compaired the new shoes to the old ones? There might be a difference. Some used a different type of pushrods from the wheel cyls.
Try opening the bleeder valve & see if you can't push the shoes back in.
The master cylinder worked before maintenance so I've sorta ruled that out for now. Also, E=Brake cable are free and slack. They were next for adjustment when we discovered this problem.
I can open bleeder screw and shoes will return to normal, ie snug around the anchor pin. As per a suggestion here, I'm going to check wheel cylinder pushrods are appropriate length.
Thanks.
