One problem related to brake hoses, lines/piping, and fittings has been reported for the 1998 Chevrolet Express 2500. The most recently reported issues are listed below.
Hydraulic brake lines failed while in a parking lot. Driving about 20 mph, applied the brakes and pedal went to the floor. Held brake pedal to the floor and the vehicle eventually stopped. Had vehicle towed to a local repair shop and mechanic stated steel brake line to left front wheel had broken due to corrosion. I had all steel brake lines replaced. Several other lines were also badly corroded.