Just can't believe those guys on the GS Resources Forum. I was able, with their advice to remove this pesky piston:
To get the pistons out hook up an airline to the hole where the banjo fits. Make
it a push fit using a plastic round piece that you get in the kit for pumping up
an airbed etc. Place a thick rag quadrupled over on top of the piston - it'll
fly off (and keep fingers out of the way). If the pistons are marked on their
sides - even slightly - throw them away. Replace using stainless steel ones and
the job is done forever - I think Nick Chambers has them.
This is exactly what I did. Have to say I was pretty pessimistic that it would work. But it popped out like a champagne cork. I would have flown off and caused some damage to me or something in the garage had I not covered it as suggested with a rag.
What I did was to take a valve from an old bicycle inner tube. Cut it down and screw it into the hole where the banjo fits. Then I attached a foot pump and pumped away. It was necessary to hold the valve in very tightly and it took 2 of us to do. But there you are; done. Thanks Hampshire.
This is where we started.
The bicycle valve.
Inserted into the banjo hole.
After some pumping with a foot pump she popped out.
Can this piston and caliper be repaired / cleaned up / put back to use?
Inside the caliper is a bit rusty.
