rear hydro brake

hi all got a blaster recently and it had front disk brakes (seems to be yamaha warrior hubs disk and spindels with upper balll joint removed and rewelded a warrior ones) might make a post about that for futur people. i havent looked to much into it, it works anyway here is my rear brake settup...

Hello I am looking for more info on doing a hydro rear brake swap on my blaster to replace the mechanical one. I hear the gsxr brake caliper and master work with some fabrication. Any tips on which caliper to buy would help and also any tips. Thanks