I have delinked my brakes as part of the RC51 front end swap I completed. I drilled the center caliper piston to the internal supply line feeding the outside pistons on the stock rear brake caliper. I used the stock rear mastercylinder with one brake line feeding the front piston on the rear brake. I plugged the center piston feed line (previously from the front brakes), and left the bleeder on the rear piston of the back caliper. I can definately lock up the rear brake now. I am using EBC HH pads on the OEM disk, no need for anything fancier than that.
On the front I am using ferrodo pads on full floating brake tech discs with stock RC51 calipers. After bedding them in I can attest to the fact that they stop faster than with the older OEM setup. Very happy with the RC51 front end swap and improvement in braking.