Brakes not very good..... :(

I changed the booster on the car. I put the booster back on that originally came with the car. First time I pushed the brake pedal it felt good. After that the pedal started getting soft. I see that I have a slight leak at the proportioning valve. I tightened one of the lines (I could see which one was dripping) and thought I was cured!! Well I start the car today to take it down the street for the first time....hardly any brakes at all. :( The pedal is soft and spongy. So I am stuck on what to do next????