The generally recommended course of action is to remove everyting from one specific donor car : spindles, rotors, calipers, m/cylinder, hoses, booster, proportioning valve, etc. Even if the parts are no good, one has a basis to compare the "new" pieces against, e.g., brake hoses. My 1971 had the floating caliper set-up, and, once I learned that the rotors in the early run of this style were two-piece (thus prone to breakage; I broke a rotor on a '73 T/C back about 1976 and never want to have that happen again), I made the swap from a '73 Fury (a Pursuit model, with police-spec only rotors) and bought the rest from NAPA. Was advised by someone that my 71 spindles would work fine with 73 rotors, but they wouldn't as there was a difference in diameter of over 1-16/inch at the shoulder. The one-piece rotors are more easily available (even J C Whitney) and less expensive to boot. I did not need to change the master cylinder/power brake booster/proportioning valve, but if I had I would have been sure to take the actuating rod, possibly even the brake pedal assembly to expedite any problems of fit and operation. Better too many parts than too few. Others have indicated that production line changes were made midway through the 1972 model run from two-piece to one-piece. For some reason I always seem to find more 1973's in the salvage yards more often than other fuselage year models and snagged the complete three-speed wiper assembly as various assorted small pieces while I was at it. (Before anyone asks, yes, the ENTIRE drivetrain was long gone from that Police Pursuit). As to brake pad and shoe material, I bought Performance Friction metallic/ceramic pieces from Firm Feel, Inc. (whom I'm happy to recommend for any suspension/steering related needs on a C-body). These components, while more expensive, are virtually fade free compared to the usual Raybestos "premium" shoes/pads. I also was able to find completely new MOPAR brake hardware, adjusters, etc. My braking is substantially improved now, with reduced worries over the stock configuration. I made the mistake of buying a remanufactured master cylinder (NAPA), but strongly advise against this piece being anything but brand new after swapping it out for other "remanufactured" replacements. (Obviously, same with wheel cylinders). New steel or stainless steel hard lines are available from a number of sources, prebent, armored, and even the correct clips supplied. I also found this to be good time to service the rear axle bearings as well as changing the rear axle fluid. If you wish to upgrade braking performance even more substantially, see the website maintained by Praise Dyno Brake. Good luck. Ross