I have a 1998 1.9TDI. I fitted new rear discs and pads a couple of years ago and all has been fine until about a month ago. On a short drive from home I suddenly became aware that the rear brakes were binding and overheating. Got the vehicle home and when all had cooled off, I removed the calipers and after have checked for any damage I wound the pistons back (they were easy to turn and not seized), checked, cleaned and regreased the caliper sliders and then re-assembled everything. I then checked all the handbrake mechanism, cables and arms, and then readjusted the cable making sure that it was on the loose side rather than over tight. All was then fine until today when the whole thing happened again. Any suggestions please?