Most likely its the emergency brake cables adjusted up too tight & holding the shoes off the anchors. Its also possible the master cyl. pushrod is not adjusted correctly. It should have a little bit of play before it starts pushing on theb piston. It possible the shoes are too thick but if they are free when cold generally they dont drag like that. They are probably too thick at the edges. You can tell by the wear pattern. You can sand them down some. Wear a respirator if you do. There may be asbestos in it.
