37 problems related to brake hoses, lines/piping, and fittings have been reported for the 2003 GMC Sierra. The most recently reported issues are listed below.
I purchased a 2003 GMC Sierra (used) -checked it out after a mechanic told me about brake line problems. My truck has extremely bad rust on the portions of line I can see (looks like clamshells opening). I have done some research and have found you have an open investigation on this problem. I own 1966 and 1980 vehicles with original tubing in better condition. My question to you is simple. A recall was issued for aftermarket fuel filters that may leak and catch on fire if you park over an ignition source but no recall on a major issue concerning brakes. I am pretty sure more people use their brakes more often than people change fuel filters. P. S. My neighbor has a 2005 Dodge that had a line rupture-lucky for him he was in his driveway!.
The contact owns a 2003 GMC Sierra. While driving less than 10 mph in a busy parking lot, the contact depressed the brake pedal before completing a left turn and felt the brakes shaking. The brake pedal extended to the floor. He was able to maneuver the vehicle to safety and continued to apply the brakes. He allowed the vehicle to coast until it came to a complete stop. The dealer stated that the failure occurred due to corrosion of the brake lines. The manufacturer would not assist with the repairs due to the corrosion. The failure and current mileages were 87,974. Updated 12/17/08. The rear main seal was leaking oil. The wheel speed sensor was replaced, due to the abs light illuminating. Updated 12/18/08.