BREAKS HAVE OUT AT 36.5K MILES. VACUUM TO BREAK LINE MESSED UP. WAS IN BUSY TRAFFIC GOING 50-60MPH. TRAFFIC SLOWED DOWN BUT TRUCK WOULD NOT BREAK. VERY VERY SCARY SITUATION. GMC DEALERSHIP KNEW EXACTLY WHAT THE ISSUE WAS OVER THE PHONE. TOOK IT TO THEM AND CAR WAS OUT OF WARRANTY BY 500 MILES. 800$ OUT OF POCKET AND TOOK THEM 10 SECONDS TO IDENTIFY ONCE THE VEHICLE WAS AT THE DEALERSHIP. SEEMS LIKE THEY KNOW THE ISSUE VERY WELL