Four problems related to brake master cylinder have 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.
I was driving on I 75 doing 70 mph I had to come to a sudden stop I applied brakes and there was no brakes. , I ended up putting truck in the ditch to avoid serious accident. It ended both brake lines from master cylinder both blew up from corrosiont hese lines went to the abs module. I was some what injured.
Brake line failed, no brakes while heading for a red light. Drive off road till vehicle stopped. Brake line from master cylinder to abs control , rotted out. Upon further inspection, all brake lines are rotted out. My mechanic states they all need to be replaced, it will happen again.
Severely rusted brake lines that split. Main line from master cylinder to abs module and rear line just inboard of lh rear tire. Pedal went to the floor on city street when driving.
Trip from long island new york to freeport maine. Traveling 65-70 mph during trip on highway 95. Arrived in freeport. Checked into hotel. Went out to truck 2 hours later with the intention of attending an event. Stepped on brake, started truck, brake pedal went to the floor. Pumped the brake pedal but it would not recover from the floor. Checked under truck for leaks and found badly rusted brake lines had burst releasing copious amounts of brake fluid. The truck was towed to sears auto department who had to rebuild the entire brake system from the master cylinder to each wheel. Sears had to replace brake lines and calipers since the calipers were also so rusted that they could not be bled. If these lines had burst on the highway; my wife, my son and me would have possibly been killed or severely injured and others on the road may have suffered the same fate. I have never seen this type of rust on any auto I have ever owned. This truck has never been exposed to salt water. Roads are salted in winter on long island. (as an aside, I had to replace the front bumper prior to starting the trip because it had rusted through from behind. It seems that inferior materials were purchased by gm).