One problem related to brake light on 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.
Driving on two lane road at 35 mph. Weather was clear, roads dry, temp 86f. Approaching a hill with intersection at bottom of hill, applied brakes and brake pedal had no resistance, nearly to floor with very little braking. Brake warning light came on when brakes applied(not before). Used parking brake to stop truck at intersection, barely missing colliding with crossing traffic. Was able to get truck to trusted mechanic, who determined every inch of brake line from abs booster to all four wheels badly corroded, like paper. Line was perforated over rear axle causing loss of brake fluid, all hydraulic pressure and no braking ability. Mechanic is certified master mechanic with over 20 years experience, said has never seen this before even in antique or abandoned vehicles.