Unless you're planning on running at full gross weight all the time (actually using it as a truck, not a Cowboy Cadillac) I think you'll be surprised at how effective the original brakes are. That's assuming you rebuild them to factory-original condition, not do a half-donkey job of it. Once they're back to good original condition, then you can decide if you need more stopping power. A vacuum booster simply makes your leg stronger- - - -it doesn't actually increase the effectiveness of the brake system or improve the traction of the tires. You'll just be able to lock up the wheels quicker with boosted brakes unless you also figure out a way to make the tires stick to the road better. A good set of radial tires might be one thing to consider before you spend a lot of time, money, and effort on a brake upgrade.
Jerry
