So I've basically ignored the Twizy since before Christmas, left it outside, knowing the brakes would need looking at before I started using it again. I asked Renault to have a look just before Xmas and they fobbed me off with a "they're not binding".
So this weekend I stripped the calipers, cleaned, lubed and reassembled. Everything is good, silky smooth pistons, calipers move freely on pins.
However the brake pads are still scuffing when moving, this goes away when brakes applied. So I'm thinking either the brakes aren't self centering, a disc isn't round (although i did check for this) or the handbrake cable needs adjustment (although it seems spot on when applied, totally gripping at the top of the lever range).
What else could I be missing?