One problem related to brake light on has been reported for the 2000 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 GMC Sierra 1500 based on all problems reported for the 2000 Sierra 1500.
On my way to the store I noticed reduced brake pedal and increased stopping distance. No warning lights were on at this time. On my way home the brake warning light came on and I had even less pedal and needed extreme stopping distance. I went directly to the repair station and the mechanic found heavily rusted lines especially in the areas of the abs module. One of the lines was rusted thru and leaking in the area of the abs module causing the malfunction. I already have had the brake lines to the front calipers replaced in July of 2012 due to extreme rust. I am having all the brake lines replaced with stainless steel at the time of this posting. This vehicle gets very light duty personnel use and shows no signs of rust in the body.