Brake Master Cylinder problems of the 2003 GMC Yukon

Brakes lines rusted which led to catastrophic failure of brake system. Repair cost $1,000. There are multiple thousands of complaints regarding this type of brake failure in this make, model, & year. This should be a mandatory factory recall. Someone is going to die because gm is not being forced to fix their faulty equipment. My vehicle was in motion and when I depressed the brake pedal the pedal went completely to the floorboard. I was driving straight ahead in moderate city traffic & narrowly missed striking the vehicle in front of me on a city street. My master cylinder was completely empty of brake fluid when examined. I was traveling 25 mph and my vehicle has 110,000 miles. (the next page wouldn't allow me to enter the speed & mileage information where it was requested).

I let my freind take vehicle and she said when she braked the pedal went to floor. She was half mile away and made it back . I looked at level in master cylinder and had to put fluid in. Noticed brake fluid on the undercarrige which led me to rusted brake line up front.

Brake line failure from abs to master cylinder due to corrosion. Upon inspection both lines needed replacement with corrosion present on the other lines, too.

Was backing up into parking space and applied brakes to stop. Brake pedal went all the way to the floor with no braking capability. Had vehicle towed to service facility and they reported that the front brake lines had rusted through causing fluid to be pushed out. I thought that these vehicles had a dual brake cylinder so that there would be braking capability on the rear brakes but that did not happen. Fortunately was going slow and applied emergency brake to stop. Paid repair facility to replace front brake lines. Second incident occurred on November, 2013 where I applied brakes prior to moving transmission from park to drive while on a hill. When I applied brakes the pedal went all the way to the floor with no braking capability. I determined that the left rear brake line is spewing fluid. Again, no braking capability in the front brake system. Had vehicle towed to a repair facility. I assume that the rear brake lines have also rusted through. I have read numerous incidents on internet about GMC brake lines rusting. This is a serious problem as there is no braking ability at all except for the emergency brake if one of the brake lines rusts. First, these lines should be made of materials that do not rust. I have multiple 60's and 70's vehicles where the brake lines are not rusted. Second, there is a problem in the dual master cylinder of these vehicles where they fail to work when either the front or the rear lines fail.

Rear brake line opened up causing the rear brakes to fail and empty master cylinder. Front brakes barely work. Estimated cost from local firestone dealer to be about 600. 00.

All of the break lines are completely rusted out. My wife had a complete break failure while driving my daughter to school. Break line over frame leading front to back failed and completely emptied the master cylinder of brake fluid, result car would not stop. This must be made into a recall, as the possibility of a major accident and loss of life is very probable.

No crash. Vehicle had not been driven for approximately 6 weeks prior to July 15, 2006. Vehicle was used for a short trip about 2 miles total. When brakes were applied the pedal went to the floor and longer than normal distance was required to stop. Brakes were very spongy. Fluid level checked found to be within normal range, normal color and no apparent leaks. Vehicle had approximately 27,000 miles at the time. Vehicle taken to dealership for repair of brakes (while there had 30,000 mile service done as well). Dealer advised that the master cylinder was bad (interior failure) new part was ordered and placed on the vehicle. Upon vehicle being returned the vehicle appeared to still have a very spongy pedal and the pedal traveled excessive distance (approximately 4") before feeling some pressure. Travel distance appears to still be longer than before problem was discovered. Tried driving the vehicle a few miles maybe 100 to see if anything changed with brakes. Brakes remained the same. Returned the vehicle to the dealership service manager agreed with me after testing that the brakes appeared spongy. Attempt to fix by the dealership advised they "found air in the lines, bled brake system seems to be working in proper order". I picked up the vehicle and the brakes still feel the same, spongy pedal travels approximately 4" before any noticeable braking function, stopping distance still appears to be a little excessive. Contacted GMC service online and advised of the problem and that I am in the process of contacting a different dealer to attempt service repairs. They gave me the name of another dealership to try. At this point problem is not resolved.

Hydraulic brake system. Vehicle was sitting in driveway without use for a few weeks. When used brakes were very spongy, long pedal travel before reaction then extended stopping distance. Fluid level ok, clear appeared normal, no apparent leaks, normal temperature. Drove to dealer carefully, service manager when moving vehicle said he almost ran through the back otf the building. Vehicle not in any accidents, service maintenance conducted at normal intervals according to service recommendations. Approximately 27000 miles on vehicle. Driven by myself 50 years old and my wife 47 years old safe drivers speed limit speeds large amount of stopping distance for braking not jamming on brakes at last minute. I scheduled vehicle for service at win kelly Chevrolet where purchased for brake check and 30,000 mile checkup. While there they advised it was interior failure of master cylinder and they replaced it under warranty. The brakes feel a little better but the pedal still moves approximately 4" before applying any pressure. I feel this is still a problem and will be taking it back to the dealer again. I believe they have a problem with the system like they had on previous s10 models in late 90's with the slow speed braking recall. Just want to send a complaint for you to be aware of in case you receive more complaints. I emailed a letter to gm while it was in the shop with the same comments and the reference to the previous for the smaller versions in the late 90's and have yet to receive a response. If this is the same problem then they may have a valve design, operation or part assemble/install defect with the system.