how the bias feels. From what I've read the piston is smaller than the Z32 with I believe the same pad. In comparison, the Z33 rear has a larger piston size and pad size to equalize the bias. I'm using the Z33 front with the Royalty Performance rear bracket and Z32 caliper and it seems very well balanced. Wouldn't mind the Brembo for cosmetics, but for the extra money and hassle to refinish and rebuild, not sure if it's worth it if performance is different. If you're not tracking at all, it's probably a mute point, but I would highly recommend using the RP bracket in the rear with whatever caliper you end up with.