One problem related to brake master cylinder has been reported for the 2015 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Yukon based on all problems reported for the 2015 Yukon.
Driving the 2015 GMC Yukon, tried to apply brakes, brakes went to floor and no braking available. Had to jump a median in the road to get car stopped. Called dealership, they were aware and said drive it there, almost wrecked again pulling into parking ot at dealership. You cannot drive the car like this, very dangerous. Being told its a common problem that GMC knows about but will only fix if its 70,000 or 6 years. Not ok, fix the problem my car is still under warranty until 100,000 miles! vacuum pump, vacuum pump belt, brake booster, master cylinder and vacuum pipe all need replacing!!!!!! make a recall before more people are hurt!!!!.