Binding rear calipers

Having problems with both my rear callipers, one was really hot today so thought I had better take a look. With rear off the ground and hand brake off both wheels can be turned by hand but do not spin, no where near free spinning. I would say if you gave them a really good spin you might get a single spin.



Took the calliper off the carrier on each side and sliders were fine and pads were moving freely in carrier too. On the Near side it looks like the issue is the handbrake spring on the calliper not returning the handbrake to the fully off position. It is not far but enough to cause it to hold the wheel to some extent. Guess that's a replacement calliper or a refurb of the handbrake mech, lubed it for now, hopefully that will help short term.



The off side was worse, however this didn't appear to be down to the hand brake as this was fully returning to its correct position. I cleaned everything up and tried to wind the calliper back a bit to see if the hand brake was poorly adjusted. In doing this I found that the piston was really tough to turn. I pumped the pedal a few times and it pushed out as it should but screwing it back in was really hard. I took it right back, put everything back together and then pumped the brakes again to adjust the calliper. When I had done this I tried to spin the wheel and found the same situation (without even touching the handbrake).



My question therefore is, if the piston is not moving as freely as it should (especially inwards) could this be preventing the brakes from releasing properly after being used? How does the piston retract to free the brakes?



Next question, should I bother trying to refurb or just buy a reconditioned one?

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