Hello,
The wheel lug bolts hold the drumi on tight . The caliper is in the way and must be removed so that the disc can be removed. The caliper can just be unbolted without dis-connecting the brake line.
Note the small "peg" coming out of the axle hub, it is used to index the drum duming re`-assembly. Make sure the emergency brake is released or it will hold the drum on. !
