Thanks for your responses. The visible part of the piston is pretty rusty, but it pushed back OK with a screw G Clamp with a 1 inch thumb screw, it seemed to be the same effort as the "good" side, though incidentally that hub was pretty warm after the 3 mile run too - the fronts were stone cold!
When I fitted the new discs and pads I clamped off the brake pipe and pushed the old piston fluid out through the bleed nipple. Fluid was last changed about 35k miles ago (5 years) and will be changed with the new callipers, I have a pressure bleed system which makes the job easy.
I considered rebuilding the callipers but from all accounts it is a bit hit and miss with the rears and the PFV ones are £60! These are new units with all the hardware and not the usual rebuilt units with a £30 deposit on the old ones, so not bad value.
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52 Silver V70 D5 SE Manual
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