Originally Posted by MaxL
Just checked - all pistons are exactly the same size. I'm pretty sure I've read that Alcon uses differential sizing, but I could not find evidence of that. Anyway, I do not think anything is reversed because the lettering on the calipers is just like in their brochure and everyone's photos - not reversed.
If the pistons are non-staggered, that would be the cause of taper wear. All the bbk's I've seen for the M3 offer staggered piston sizes. Perhaps there is a special reason for Alcon's design?