brake upgrades

wanting to put a 1.8 20v t in my mk1 1.3 1983 driver and was wondering what sort of brake upgrades people have done, i have read on a couple of forums that alot of people have been putting the 16v servo and master cylinder to get enough brake fluid thought to caliper and discs on the rear. i was just wondering what caliper and discs upgrades people have done before and what changes people had to make to the hub set up to fit the new caliper and disc's.