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snottyotter
@Ben689908
Finally got around to having a go at unsticking a sticky piston, yesterday.
GRX800, front.
I cleaned both pistons thoroughly - three times. Worked them nearly all the way out, individually and cleaned with brake cleaner and then "lubricated" with a cotton bud of mineral oil.
Wheel back in, calliper loosened off, pads back in. Calliper centred, brake applied a few times to grab the disc and then tightened the calliper fixings.
It's better, but still not perfect. One piston still refuses to draw all the way back.
Am I missing a trick? These brakes are almost new so I am guessing a defect is unlikely.