65 Dart GT disc brakes

FWIW the Kelsey-Hayes brakes were used from 65-72. Identifying features were fixed 4-piston calipers and small bolt pattern rotors. From 73 on a single piston Delco style caliper and unicast hub/rotor were used.

As others have noted, there are plenty of write-ups out there, as a quick search will show. But this one is sort of the grandaddy of them all http://www.moparaction.com/Tech/archive/disc-main.html