Unsticking brakes 411-S1

[Claude]

Rebuilt 2 miles and 18 years ago, the 411-S1 rear brakes have become sticky from inactivity. Now that I have sorted the overheating (rebuilt the radiator), it's time to move the car. But moving tends to be slightly dragging, and jacking up the rear wheels, it varies... sometimes easy to move, but hard pressing of the brakes tends to find they do not release.

I've been through the forum looking for hints, but appreciate if someone can guide me through the best way to get them less sticky. Do they require removal and refurbishment, or is there a less complicated way to get them working smoothly? If removal, are there tips that would be helpful?

How are the rear calipers removed? I read somewhere that it is more complicated than just unbolting. And if it is not completely locked up, but tends to stick and unstick, is this something that can be lubricated and unstuck, or is it a candidate for rebuild.

All advice welcome.