Minitim's Clubby - Blaze

[Enzio]

I see your replacement stainless steel caliper pistons do not have the step in them like the originals. And this is similar to others I have seen.

When I had mine made, I used an original steel one as a sample and had the step cut in - this was also advised by Kollie to be done since I borrowed the sample from him.

I can only imagine that the cut-out was added to change the pressure applied over the back of the brake pad, perhaps they had issues with the stock pad material degrading on the outer edge of the pad. Not really sure as I haven't investigated it any more, but it would be in line with the modern designs on multi piston calipers where the pressure over the pad is controlled via the piston size.