JustenGT4 has STi discs & Brembo calipers on his uber V8TT ST185, so I'm not sure how they work (but he has fully modded the steering knuckles for that car)
You are correct on the discs (WRX STi jobbies - same as I used), but the Calipers are Z32 300ZX (or maybe R33 Skyline ones)