One problem related to brake abs warning light has been reported for the 1998 GMC Sierra 1500. The most recently reported issues are listed below.
The contact owns a 1998 GMC Sierra 1500. While driving at any speed, the rear brakes shake. The vehicle was taken to a service station and the tires were replaced and balanced, the brakes were adjusted, and the brake shoes and rear brake pads were replaced. However, the rear of the vehicle continues to shake. The contact was informed that the brake shoes move about and there was no way they could be repaired. The contact also stated that the abs light and the service engine soon light were illuminated and have been since April of 2006. The current mileage was 161,000 and failure mileage was 147,625. Updated 3/5/08 updated 03/05/08.