i shouldnt even reply because after your second post,..you just sound like a fawking idiot,..but since we are talking about brakes,..this means safety and so ill try to give you some help

if you can, go ahead and source out a rear disc swap from a GSR,..after you got disc all the way around,..go with brembo blank rotors with hawk or axxis brake pads,...also i suggest steel braided brake lines and some new brake fluid