One problem related to brake popping noise has been reported for the 2002 Chevrolet 1500. The most recently reported issues are listed below.
The incident happened while driving home from toledo ohio to home in white lake michigan. My exit was normal when exiting the freeway. I applied brakes to begin slowing down. As I approached the end of the exit ramp the traffic light was red with other vehicles waiting. I applied the brakes harder and heard a popping noise. The brake pedal went to the floor. I tried to pump the brakes to get them to work to no avail. Rather than running in to stopped cars I ran my truck off the road. I was lucky that I was able to stop my truck without hitting the vehicles waiting for the light. I went online to review this and found there are numerous complaints. One comment from gm is that the vehicle will stop if a line ruptures. Not true. Also, since when are brake lines a maintenance issue and not a safety issue. My manual doesn't say replace brake lines every 20,00 miles or 5 years.