Five problems related to brake fluid leak have been reported for the 1999 GMC Sierra. The most recently reported issues are listed below.
Brake fluid leaking all over bottom of truck spraying out I took to a mechanic and had 1000 dollar brake line job done got truck back and abs brakes worked like manual brakes had a sensor and 2 ball joints replaced im being ripped of from a GMC loyal customer I was I guess back to Ford or Toyota for my next new trucks I had warranty issues you cheap [xxx] wouldnt pay for a waterpump that was leaking only a 7 dollar gasket also had a transmission on my work van repair and then replaced after a month of run around. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).
The contact owns a 1999 GMC Sierra. The contact stated that while driving 5 mph, he attempted to applied the brakes but the pedal went to the floorboard and failed to stop the vehicle. The contact noticed brake fluid leaking underneath the vehicle. The vehicle was not taken to the dealer. The failure and current mileage was 158,000.
Total brake failure occurred while moving out of a parking slot. Pedal went to the floor; upon investigation found brake fluid pouring from left rear wheel area (could not determine actual location); suspect corroded steel brake line. Further investigation found evidence of fluid leakage in home driveway where parked overnight. This is 2nd brake line failure on this vehicle (1st was January 2012; replaced line but was advised by mechs that other lines were ok at the time, this is two brake failures in 7 months on this truck).
While my buddy was backing my boat trailer and boat into the water for me, he yelled to get out of the way, the vehicle was sliding down the boat ramp. He was able to stop before going into the water. I told him I just had the brakes done this fall and he said the brake pedal went straight to the floor. I got in to pull the truck up and the pedal did go straight to the floor. A large puddle of brake fluid was on the ground at the boat launch. I had the vehicle towed to the repair shop and found that the brake lines had corroded so bad, they rusted right through and lost almost all of the brake fluid. The lines were so bad, I needed to get the entire brake line system replaced.
I was driving and went to apply brakes for the stop sign ahead, and I had no brakes. Once I had the truck home I parked it. I determined that the brake lines had rusted through by having a piece of cardboard under the truck to locate the leaking brake fluid. I'm so lucky that I didn't have a camper on the truck and had gone on vacation to colorado, as I intended this to be my recreational vehicle for this purpose. I am haunted by the possible scenarios and crashes that could have occurred to me and my family. Wife, son, and two daughters. This needs to be addressed before other human beings end up seriously injured, traumatized, or death being very highly likely. So I have a near new truck sitting in the yard for nearly the past five years. My attempt to install after-market brake lines has been a failure. Gm should be responsible for this catastrophic failure. I know as time goes by other brake lines on these models will rust and fail. I will be here as a witness, and so will the truck as I have refused offers to sell it.