1998 Dodge Caravan Brake Fluid Leaking Everywhere!

I noticed that the brake light came on when I was driving to work so my boyfriend changed the brake pads. The light went off. A couple weeks later it came back on again and it was because of low brake fluid. We filled the reservoir and the light went off. The next day on came the light again so we took the tire off to see what was wrong and there is brake fluid everywhere! The tire was completely soaked along with everything else there but only on the drivers side. The passenger side is dry as a bone. What do we have to replace???