I just got back in the house, 1 hour late for work at the mo but im soaked to the skin,
Got the pins out and smoothed & polished the sticky one till it works perfectly. Not sure if the piston is sticking too tho cause the last owner let the pads get right down to the metal (all four!) so the piston has been extended for a loooooong time and it doesn't like retracting now.
Luckily the moving bit is easy to take off from the breakers. If i find one wi thick pads then chances are the piston is still free. I take it its a pain to remove the piston and clean it?