I had 4 wheel twin power assissted disk brakes on my 1000 coupe,but it was a rallycar

now I did buy the car with this conversion so some of the details I am not totally sure of but here goes: 1200 hubs,bearings,and rotors then it had mitsubishi sigma front calipers and brackets,they were the early sigma which had a small and simple disk caliper.The sigma bracket needed 2 of the bolt holes oversized and it would bolt straight up to the 1000 stub axle,then the brake caliper bolts straight on.I think the disk rotor needed 1mm taken off it in a lathe aswell (get out the tape measure).
The rear disks were N12 pulsar rear disk calipers on R31 rotors and a hand made bracket.I recently made one of these brackets for my sunny disk rear,it looks like a pair of sunglasses and bolts up to the inside of the diff axle bearing flange.Then you simply cut all the drum brake assemble off leaving the 4 bolt holes which hold the axle and bearing in place and put it together.
Sounds like a lot of work but it stopped like a F1 datto,I have no idea what the boosters were just they were remote vacuum units.
goodluck
Al.