One problem related to brake abs warning light has been reported for the 1999 Chevrolet Monte Carlo. The most recently reported issues are listed below.
I started to hear a slight clicking sound when I pressed on my brakes, only every once in a while, like the sound I would hear when I would hit a pot hole in the road while I was braking and my "low traction" light would come on. It progressively had started to get worse over the course of the month. I have had two garages look at my car, and they cannot figure out what is making the repeated and very evident clicking sound everytime the brakes are touched. I have had a diagnostic test done on the car and no codes are showing up. They say it could be the abs module, but they are not sure, and that I would have to bring it to the dealership to have it investigated further. They were (the garages) both puzzled at what this sound would be caused by.