I had the same problem the following links helped, i used a g-clamp to put pressure on the piston the turned it clockwise using a pair of narrow grips (plumbers/electricians grips) Be careful not to damage the rubber dust boot around the piston when roating them back in. The anti seize compond mentioned above reduces the amount of chatter & squeeling when the brakes are applied. Once you get the hang of it its dead easy it took me 1.5 hours to get one side done but then about 10 mins for the other side once i had worked out what to do. Good luck.

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