One problem related to brake drum wheel cylinder has been reported for the 2000 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 GMC Yukon based on all problems reported for the 2000 Yukon.
While coming to a stop, at low speed on dry pavement my vehicle's antilock brake system (abs) activated and despite continued pressure on the brake peddle the vehicle advanced ~8 feet beyond the intended stopping position, nearly hitting a stopped school the process. Intrigued by the problem I experimented to better understand the intermittent problem for several weeks before, for safety reasons, defeating the abs by removing the fuse that powers the control module. As I have now discovered, activation of the abs to low speeds continues to be a relatively common problem with gm light trucks of the 2000 model year and newer. Indeed my vehicle was recalled in December, 2005 to supposedly provide a "fix" so that this problem would not occur. I have spoken with a gm engineer (maybe a marketing person in reality) who told me some nonsense about this not being a recurrence of the sensor problem. Actually it was the conversation with the engineer that lead to making this complaint. I am not so upset about the fact that the system failed, failure do occur, the problem is with how the system reacted in failure. I work on vehicle sensor systems (suspensions and fluid diagnostics) and a major design constraint for any system is that any failure mode cannot not lead to an unsafe condition. In the case of my vehicle's abs, the failure mode almost allow me to hit the school bus. I thought dual channel master brake cylinders were required many years ago (1968 if I recall correctly) to take the excitement out of brake failures. Looks like gm has tried to renew the thrill of brake failure.