I used late seventies Lincoln Mark parts for the brake conversion. Grab the master cylinder, booster, pump, front calipers, and the complete rear disk assemblies. This will net you a matched system with lots of stopping power.
For power steering I like the 4x4x2 PS box as it is stouter, more powerful and cheaper than the stock Bronco box and it mounts in the stock position. (see BC Bronco's). I have been using the F150 2wd box for 15+ years and it works very well, its longer sector shaft is good at reducing bump steer on lifted Boncos, they are very very common and have plenty of power. The down side is they mount inside the frame and hang down further which bugs the rock crawlers but since I don't do that it has never been a problem.
Regards, Tony