Just buy a rebuild kit from Fowler ins Bristol(mail order) Comes with pistons and seals, Take out pistons (Use a set of 5 holes..or waterpump pliers...the ones that you can open up to a huge span) dig out the seals, thouroughly clean all the seal recesses with a pick/scrapper(not a srewdriver) or a softish wire brush on a dremmel. clean the caliper all over...personaly id replace the beed nipples with S/S items from HEL.
Then thoroughly rinseout the claiper with clean brake fluid, empty, and dry (Get a can of air duster from an electrical shop) then place the calipers indoors near a radiator to make sure that they are dry.
Rebuilding.
Put the seals in, then dip you clean finger into some clean brake fluid and rub over the seals. Dip the clean pistons into the clean brake fluid and insert them very carfuly into the holes and push both fully in. Undo bleed nipple slightly, and fill the cliper through the banjo hole, nip up the bleed nipple. Fit back to bike using new copper washers and tighten the banjo to 23ftlbs.
Repeat for other side.
Bleed brakes in one of the many ways that there are.
When re assembling, the thing is to be clean, spotlessely.
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