How much are they asking?
I have a 97 C1500 pickup (same frame, drivetrain, etc.) and I've had numerous problems with mine. It'* finally stabalized, but the biggest issue I had was with the rear axle. It lost the carrier bearing and seized. That was at 91,000 miles. I eneded up swapping in a rear axle from a 94 K1500. That axle had only 50,000 at the time.
The other major issue I had was with the transmission. I had to have it rebuilt twice in the 30,000 miles I've owned it. Granted I do a fair amount of towing, but twice was a excessive. I also replaced the ball joints, wheel cylinders, all 4 02 sensors, u-joints, and the door latch on driver'* door. I haven't had the braking issues, however.