One problem related to brake disc pads has been reported for the 1998 GMC Sonoma. The most recently reported issues are listed below.
My 1998 GMC Sonoma developed a braking problem - pulling hard right. The vehicle (under warranty - 15,000 miles) was taken to the dealership to correct the problem. The front rotors were turned, pads deglazed, wheel bearings repacked, rear drums turned and shoes adjusted to correct the problem. The cost to me was $217. I have never experienced brake problems at such low milage on any vehicle I have ever owned. I am convinced that a defect exists in the braking system that gm is attempting to blame on the consumer.