I have a Series 2 Year 2000 model Stagea.
After 8 years of stock brakes with a master cylinder stopper, I did the R34 GTT Sumitomo "Brake Upgrade" with brand new standard RDA rotors a couple of months ago. I'm now at the tail end of bedding in because I don't drive it much.
From what I read up on, the BM50 that's stock on the S2 is isufficient, and it feels sufficient to me. There is barely any difference to brake pedal travel to me.
Only yesterday, for the first time since the upgrade I used the brakes somewhat hard, and I'm not yet convinced that they will pull up the Stagea any better than stock. It's a bit early to tell as yet.
So far the the only advantages from the upgrade would be:
- Weight reduction because they are alloy.
- Greater heat dissipation because they are alloy and the Rotors have larger mass, therefore less brake fade.
- Won't be prone to warping because of the above.
- R34 brake rotors and pads will always be readily available, and possibly cheaper, being more common.
- The Sumitomos look sexy!
Will post again in a couple of months with my final verdict.