One problem related to brake disc has been reported for the 1998 Chevrolet Tahoe. The most recently reported issues are listed below.
Front end shimmy at speeds over 50mph. Balanced and rebalanced tires, aligned front end 3 times in 6 months. Finally replaced all 4 tires w/new firestone tires. Aligned front end w/new tires. 3 months later, rotated and balanced tires - front end shimmy continues to occur. Have tried alignment, balancing tires, and new tires. Not acceptable to have significant front end shimmy beginning at 15000 miles. Also increased vibration when braking - rotors have already been replaced twice and vibration that shakes steering wheel continues to occur when braking.