refurbing rear brake calipers

[pug306driver]

So, to remove the pistons to clean the corrosion on  the land between the hydraulic seal and the outer gaiter is a pita??

This area tends to corrode causing the piston to be stiff.

There is an exploded view in the 306 Haynes manual nut its not that clear, or clear how the caliper self adjust system works??

Since the piston is wound back in, suggests a thread system, possibly with a "flat " area on part of the thread????

  great that worked

The 4 bellows parts on the top right are the slide pin gaiters. on the extreme top left  is the hydraulic piston outer gaiter.
Next to that on the right is the main hydraulic seal.  the 2 o rings are for the slide pins. the slightly larger o ring is for the caliper hydraulics?? probably a hydraulic seal for the handbrake rod to the hand brake mechanical parts??  and the "eared o ring" is similar??? looks as if the "ear" covers a port, a one way valve????the rest is self explanatory.

Hope this helps with any language problem as we now have the same hymn sheet.