I have changed the rear discs and pads on my 306 hdi due to one side pads discs warn.
So I checked the calipers other side was fine 2 bolts moving smooth and winding caliper in and out.
The other side out of the 2 bolts 1 was not free moving sliding so greased it up and got it free so both worked also winding caliper in out out ok to.
But its still sticking slightly there a rubber boot with the arm for handbrake cable going in to it I think it might need greasing up in there?