Paint problems of the 2002 Chevrolet 1500

I was driving when I went to stop and the pedal was soft. The truck still stopped but the pedal didn't feel right. I was able to get to my in-laws house,about 2 miles. When I got out I saw brake fluid leaking from the brake lines running along the frame on the drivers side. They are the lines that go to the abs module. When I inspected further, all 4 lines were either leaking or about to. That is when I noticed both rocker panels, just under the doors, were rusted and the passenger side rusted through. The doors are not rusted and there is very little rust on the truck even where the paint has flaked off.