depending on the car and year....you will need a brake booster,brake booster push rod and mounting linkage that runs to the brake pedal,brake booster brackets and various brake booster support brackets,you should run with a power brake booster proportioning valve, brake lines from the valve up to the master cylinder plastic brake booster vacuum fixture and hose to run to the intake ,firewall gasket,brake booster bracket thin gauged metal plate,nuts and bolts and fluid.
I had a power brake set up in my duster but I was missing the booster and some other parts.....I bought everything i needed but COULD NOT find a new booster and the one used one I bought was a rusted out piece so I decided to say screw it and convert to manual brakes which required getting the manual brake pushrod set up and running new lines from the proportioning valve....and I decided to keep the power brake valve.
to drive manual brakes is deffinetly alot harder braking...you have to put your foot into it to stop....where as power brakes requires little effort.
BUT to pop the hood on a non power brake car looks MUCH cleaner and less clustered up.
the choice is yours but if you have to scavenge for parts to convert to power brakes...be prepared for a head ache LOL
I had tough luck finding parts for my 72 duster.