listen, when youre in there (the wheel well) look on the brake, theres a silver or gold pin on there with a flat head screw driver slot, that has to be turned to release the pressure so you can remove the pad- youll know what im talking about as soon as you see it, its the only thing under there that looks like that-
just check this out:
http://www.danoland.com/nsxgarage/br.../rearpads.html believe it or not, the NSX brakes are almost exactly the same as the si's- hope this helped, have fun- peace