One problem related to abs brake fail has been reported for the 1997 Chevrolet C2500. The most recently reported issues are listed below.
Whenever the abs brakes are applied, they feel very hard; also, make noise when applied. Vehicle would stop 1 car length further. Happened 5 times. It's intermittent. Took to dealer to check out. Problem not found. Abs also failed when applied over rough pavement/rail road tracks/bumps, etc.