QUOTE(fiid @ Jun 11 2006, 08:26 AM) 
Regardless of that - why would you want consistently uneven pad wear? Is this a common practice on mutipiston calipers?
Yes. Every 3 piston caliper I've seen has different sizes. With a single piston, you have totally even pad pressure and the leading edge of the pad does ~80% of the braking. With more pistons with different sizes, you spread the braking effect throughout the rest of the pad.