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I ran with front discs for about 5 years without any kind of booster with absolutely zero problems. A lot of guys will say that you have to have the booster or a proportioning valve to make them work correctly. That is both true and false. True, to a point. Most disc systems are designed with a boosted system & prop valve in mind. That being said, you run the hit and miss chance that it will or won't work with out it. I was one of the lucky guys that was able to run it without the boost system. When I went with rear disc as well, I moved up to hydroboost as well. I still don't run the prop valve and have never had a problem. Before you go plunking down $500+ on a booster system, look at both the hydro & vacuum systems. If you already have PS, it is cheaper to go the route of hydro than vacuum.One thing I did figure out is that front discs won't do you much good without the booster. I don't know how it would work with adding the booster and leaving the drum brakes as is.