One problem related to brake master cylinder has been reported for the 2000 Chevrolet C/k Pickups. The most recently reported issues are listed below.
2000 Chevrolet silverado 1/2 ton 4wd. 114m. Abs activation under 6 mph. . . . . . . . . No lockup, no reason. Escalated to total brake loss when this condition starts. Looked on the internet at similar complaints; primarily found: rusted and leaking brakelines, or malfunctioning abs cured by removing the fuse for the abs system. Checked for fluid loss, there was none. Checked power booster and master cylinder; found no problems. Removed the fuse for the abs, problem fixed, brakes function normally. A brake system should not fail to a condition of no brakes when the abs system malfunctions. . . . . . . . . Google this and you will find numerous accidents/loss of vehicle control.