One problem related to power assist brake hoses, lines/piping, and fittings has been reported for the 2003 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 GMC Sierra 2500 based on all problems reported for the 2003 Sierra 2500.
2003 GMC sierra denali with brake line failure problems. The consumer complained of a very soft pedal and sometimes the pedal would go to the floor before stopping. The dealer claimed nothing was wrong. The consumers wife was driving the vehicle and when she applied the brakes, on an incline, she traveled backwards out of control and struck the neighborhood sign. She experienced neck and back pain. The consumer arrived at the scene to find massive amounts of brake fluid dripping down the frame from one of the brake lines located on the drivers side. The consumer was informed the brake lines had excessive corrosion and failed. The consumer stated when he attempted to stop, the brakes completely failed. The brake lines were rusted with a hole completely through. The consumer stated the right rear brake line was replaced under warranty. The second time the incident happened the dealer replaced the entire brake line system.