One problem related to brake fluid leak has been reported for the 1998 Chevrolet Silverado 1500. The most recently reported issues are listed below.
Pulling into driveway to park into garage, pressed on the brake and it went all the way to the floor. Pushed down on emergency brake to stop the truck before it hit the garage wall. After placing the truck in park I opened the hood to see one of the badly rusted lines connecting to the front driver side wheel leaking fluid. Inspected all the rest of the brake lines personally all of the lines are severely rusted leading to abs & master cylinder. Only line not affected was the rear break line I had replaced 2 years ago due to the same issue.