Also be prepared for the disc to be stuck on the hub. Possible on older cars. Soak the area where the hub meets the disc with release fluid. Leave it to do its job. Try pulling the disc off but you may need more rust release fluid, a bench press would make this easier but careful drifting should do it. Keep the hub bearing areas sealed off.
Two years ago I upgraded with new solid discs and Mulfab callipers with braided pipes. The old discs were QUITE tight so used careful drifting to ease them apart. Hubs off and soaked the mating joints overnight on the bench. I put a VERY small smear of copper grease on the hub/calliper mating surfaces before bolting back on. Clean everything thoroughly before refitting callipers.
