Brake pad/caliper problem?

[puglove]

In all honesty, I doubt it's any of the above although they're worth checking.

I suspect your pads are a tight fit in the carrier, and the caliper is forcing that pad to pivot rather than slide, hence wearing on the outside where the force is being applied. Take the pads out the caliper, wire brush the carrier where they locate, and be prepared to file a little off the edges.

Exaclty this ^^^^^^^^

I had this problem on my 266 calipers. Kept munching pads and discs. Couldnt for the life of me work out what it was. Anyway turned out there was a big lump of corrosion where should slide. Which ment they would slide so far then the bottom would get stuck but the top carried on slidding cousing the pad to pivot and only contact the top. This put all thr braking force on the top of the pad and shredding them.

Id advise a "pencil" wire brush bit in a drill the clean it up. The a mini belt sander (if you can get one. You can hire them) then copper slick the feck out of them. Oh and replace pad and disc depending on how bad the ware is.