Brake Fluid Leak problems of the 2004 GMC Sierra

Nine problems related to brake fluid leak have been reported for the 2004 GMC Sierra. The most recently reported issues are listed below.

car   Brake Fluid Leak problem 1
Failure Date: 12/30/2014

After having a gm dealer perform oil change, perhaps 1/4 mile down the street from their facility encountered traffic stopped at an intersection in front of me. Applied the brakes to find that they felt mushy, and before completely stopping went to the floor. I used the parking brake to bring the vehicle to a stop without crashing into the cars in front of me. When the light turned green I nursed the vehicle into a parking lot using the parking brake and looked under the hood and could find no issue, the weather was very wet and sloppy, and light snow so I could not see the tell tale fluid leakage from a brake line. Because I had lost all braking I assumed that the master cylinder had failed. I had changed all calipers, rotors and pads several months before, and at 140,000 thought that the master cylinder failing would be unusual, but the only thing that would cause complete failure. After replacing the master I attempted to bleed the system only to find that the problem remained. Now that the under hood area was completely dry it was clear that the failure was rust through at a point the line to the left front wheel was in contact with the frame rail below the master cylinder. The oil change had probably caused movement of the line resulting in the failure. Moving some of the other lines made it apparent that all of the hard lines were shot. The slightest movement caused them to fracture. Worse than that, they were all encased in a "shell" of rust from one end to the other, concealing how fragile and dangerous they really were. Repair estimates were anywhere from $800 (local mechanics) to $3,400 (gm dealer). Lovely. I had a 1994 s10 blazer that I sold a couple of years ago with 290,000 miles on it, original brake lines and all. Changed the lines myself in a weekend for $120. 00, the gm parts guy new exactly what I needed and had the "kit" in stock, what a surprise.

car   Brake Fluid Leak problem 2
Failure Date: 12/28/2014

On December 28, 2014 I was driving my 2004 GMC pick-up truck and suffered total loss of brakes. This happened as I was approaching an intersection and I narrowly avoided an accident. There was no warning prior to the brake failure - no warning light was on, and no gradual decrease in braking ability. After the failure, I determined that there was a sudden and massive leak of brake fluid from a rusted brake line. Previously, in April of 2014 I had my pick-up truck serviced at an authorized GMC service center. At that time, the service ticket referenced “condition of brakes to be in yellow – requiring future attention”. It was my understanding that the issue at that time was brake rotors would need to be replaced at the next service interval. There was no mention of any potential danger from brake line rusting/failure. Upon researching vehicle issues on the web I have discovered that there seems to be an inordinate number of brake line failures for vehicles of my type. It appears GMC has refused to issue a recall. I had my vehicle towed to the GMC dealer and had them replace rusting brake lines ($801. 64). The replacement GMC brake lines installed are of a different (improved) design - they have a painted/protective coating on them, which appears to be an attempt to address past premature brake line failure issues.

car   Brake Fluid Leak problem 3
Failure Date: 11/21/2014

Started out when brake fluid started leaking from the truck. Brake petal went to the floor. Luckily did not happen when was driving. Found out the brake lines were rusted and was leaking and the repair cost would be over $1200. Looking on the internet this looks to be a known for certain GMC/chevy year trucks.

car   Brake Fluid Leak problem 4
Failure Date: 08/20/2014

I was driving in a 40 mph street when I noticed the trafic signal was about to turn red when I applied the brakes the pedal when down to the floor I lost all brakes I slowed down by down shifting the transmission and aplying the emergency brake. When I pulled over there was brake fluid leaking all over under drivers side door. Upon inspection I noticed the brake lines rusrted out and lost all fluid. I could have been killed there was no warning. I needed to have my brake lines replaced I beleive this is a start of something bad if gm dosent act on this problem.

car   Brake Fluid Leak problem 5
Failure Date: 08/16/2014

Brake pedal had no pressure and went to the floor. Truck wouldn't stop. Later I noticed a brake fluid leak. There was no leak before the incident and brakes worked perfectly earlier in the day. If I hadn't been in a parking lot and out on the road, there would certainly have been an accident.

car   Brake Fluid Leak problem 6
Failure Date: 07/09/2014

I had not driven my truck in a few months due to other problems with the ventilation controls. While beginning to prepare the truck to tow a 3500 pound boat I needed to reposition the truck in my driveway. The driveway slopes down to the street. While moving the truck, on my driveway, the brake pedal went completely to the floor. Pumping the brakes was not able to stop the truck that was traveling at idle speed. All braking was gone and the truck rolled down the driveway and into traffic on my street. By turning off the engine and coasting to a stop (in gear) just avoided an accident. After getting the truck back in my driveway I found two distinct puddles of brake fluid under the truck. Inspecting the brake lines showed that there were at least two different failure points in the brake lines. One closer to the master cylinder and another a few feet further back. I believe one failure occurred in the front brake circuit and the other was in the rear brake circuit which led to the *complete* loss of braking. This is contrary to gm claims that this failure can not lead to total brake loss. I have pictures and video of the failure points that I can forward if needed.

car   Brake Fluid Leak problem 7
Failure Date: 08/31/2012

I left my house for work and approx. 3 blocks from my house I attempted to slow down to make a right hand turn. I pressed on the brakes and the pedal went all the way to the floor. I had no brakes. At this time and this was the first time, the brake light on the dash came on. I was driving at 30 mph with no brakes, I coasted into a parking lot and used the parking brake to stop the truck. Outside and under the drivers door of the 2004 Sierra extended cab there was brake fluid leaking. The 8 year old truck had rusted brake lines that failed. My concern is that I lost all brakes without warning. After a little research I noticed many of these trucks have the same problem. They are 5000 pound torpedos on the road and without warning. Will something be done before a serious accident occurs? I tried contacting GMC via their website e-mail but an error message occurred. Try a complaint on their site. . . . . It don't work!!!.

car   Brake Fluid Leak problem 8
Failure Date: 07/09/2012

Brake fluid all leaked and I barely stopped the truck on my home driveway. Dealer says I need to replace all four metal brake lines.

car   Brake Fluid Leak problem 9
Failure Date: 02/15/2005

While driving 5 mph consumer lost power steering and braking control. Consumer managed to pull over, and had the vehicle towed. Dealership was notified, but did not resolve the problem. Consumer states he stepped onto the brake pedal and heard a loud explosion under the hood. The consumer immediately lost brakes and steering and smoke also poured from under the vehicle. Once he vehicle was stopped the consumer exited the vehicle and saw fluid pouring from the vehicle onto the ground. The hood was opened and the consumer saw the vehicle was taken to two different dealer but the found nothing wrong. The dealer replaced the hydrobooster assembly accumulator which had come apart.

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