GMC Sierra Denali brake failure problems

Filed Oct 29, 2020 · Brakes, Engine · 350 miles · TN

Two issues broken valve spring caused engine to shut down, second service brake, brake failure light, service ESC, service trailer brake messages causing brake failure

Filed Oct 26, 2020 · Brakes, Driver assistance · 14,700 miles · TX · 1 injury

I nearly died when my brakes failed on my 2018 gmc denali this morning. I was only going 60 MPH when another driver cut in front of me, and hit their brakes but when I tried to stop, I could not! I then began swerving from lane to lane because it was raining. Thank god I didn't die and that the person on the right slowed down and moved out the way. The truck seemed to be pulling me to the right. Why I have no idea. But why is gm putting people lives at risk like this? Why are we having to suffer or put our families in jeopardy. This makes no sense. My chest started hurting really bad afterwards, because I was so scared. I was on a 2 lane highway going straight but even that doesn't cause a vehicle not to respond like it did.

Filed Jan 25, 2020 · Electrical, Steering · 970 miles · TX

On january 23rd I started the gmc via the gmc phone app and when I got in the truck pushed brake and start button and that's will gauges went crazy saying brake malfunction .steering ,speed reduced to 62 MPH and brake pedal went to floor with little to no brakes and stopped the truck turned it off and on twice before all codes cleared except now the check engine light is on . Brakes appeared to work fine after te second time of turning the truck off and on .970 miles on it!

Filed Jan 13, 2020 · Electrical · 6,200 miles · NH

Tl* the contact owns a 2019 gmc sierra denali. The contact stated that the vehicle was taken to the tulley bmw of nashua dealer (603‑888‑5050, located at 147 daniel webster hwy, nashua, nh 03060) for an oil change, and it was mentioned that there was a recall. The technician performed a software update and repaired the seat belt under the federal safety agency campaign number: 19v814000 (seat belt). The contact stated that following the repairs, later that same day, the contact attempted to use the phone and the dashboard illuminated with all kinds of warnings, included, brake failure, no ABS brake. No power steering. Etc. The vehicle was taken back to the dealer who stated that the phone app should not be used with the software update. The manufacturer was made aware of the failure and provided a case number: [xxx], telling the contact to expect a call back. The contact was not called back. The vehicle was not repaired. The failure mileage was 6,200. *dt contact stated gmc phone app repaired. ('parts of this document have been redacted to protect personally identifiable information pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).')

Filed May 15, 2019 · Brakes, Transmission · 27,000 miles · AR

Brake failure issue at low speed. This happened in two separate occurrences in parking lots. The brake pedal became very still and required grabbing the steering wheel and using it to pull myself down harder on the brake pedal to get the vehicle to stop. This resulted in greatly increased stopping distance. Fortunately no vehicles or people were in my path during these occurrences. Gm has since repaired my vehicle. I have since received a notice that they are repairing this issue only after the owner has a brake failure problem. This is extremely unsafe and is unacceptable. Owners need a solution and do not need to worry that this issue will arise again. If I hit a person or a vehicle, will gm pay for medical bills, vehicle repairs, legal fees? This truck as well as my last 2009 chevrolet silverado had issues with the drive train that gm classified as normal. These trucks should not have drive shaft clunk when stopping at a traffic light. These vehicles have major mechanical concerns and their quality is trash!

Filed May 6, 2019 · Brakes · 67,000 miles · FL

The brakes did not work at slow speed going forward or in reverse

Filed Mar 23, 2019 · Brakes · 44,972 miles · PA

At 44,972 miles I began to experience loss of braking at slow speeds (10-15 MPH) on multiple occasions. The brake pedal lost its spongy feel and felt hard and dead. No matter how much pressure I applied to the brake pedal, my truck continued to roll forward. It was a scary feeling to lose control of the vehicle especially because I had my 10 year old daughter in my truck the first time it happened. I had to depress my emergency brake to bring the vehicle to a stop. I pulled the truck over and turned off and on the ignition and the brake pedal regained its spongy, normal pressure and feel. The brakes felt normal for about a week or so and I felt maybe it was an isolated incident until the same problem occurred when I was driving home from work in city stop and go traffic. I was driving about 5-10 MPH trying to come to a stop behind the car in front of me when the truck continued to roll forward. I barely had enough time to depress the emergency brake to stop and came very close to hitting the car in front of me. It would have been at very low speed, but nonetheless a collision. I took the truck to the dealer to have the problem checked out and ended up having to replace the vacuum pump assembly for $656.50, parts and labor. I definitely feel this is a valid safety issue that deserves investigating and doing either a safety notice to vehicle owners that could be effected or a recall. Had I known about the potential issue I would have been better able to deal with it. It really shook me up the first time it happened. I didn't feel safe driving the truck even 10 feet afterwards.

Filed Nov 24, 2018 · Brakes · 46,000 miles · MA

Power brake vacuum pump issue. Lost brakes while driving in stop and go city traffic. Had to have truck towed, was unsafe to drive due to no brakes.

Filed Oct 2, 2017 · Airbags, Brakes · WA · crash · 1 injury

I did not know about this site and this accident happened in oct 2014. I was going around a curve with 40 MPH speed limit and I was going 40 MPH. I started to brake as this was downhill and a very large truck and I did not wish to increase speed as I followed the curve. My brakes did not respond and sank to the floor with no resistance. I had no steering ability either. I ended up in a head-on collision with a very large tree and the airbags failed. I split my head open on the steering wheel despite blocking my face with my forearms crossed; a de-gloving 10-12 inch laceration down to the skull that wraps from my nose bridge around to my right ear in the circular shape of the steering wheel. My right leg was pinned into the center dash area as the engine block and steering column were shoved into the cab. I had to be removed from my vehicle with the jaws of life by emergency response teams. I am lucky to be alive. My quadrasteer was declared totaled by usaa insurance and destroyed without my knowledge. I called usaa 3 days after the crash after finding so many brake failures on this vehicle/year model and was told it was already destroyed, so doing an investigation was not possible. I have lived in pain and also paralyzing fear of driving since then; 3 years. I am a disabled military veteran with ptsd and prior brain surgery and this accident caused to me isolate so severely I could not even attend medical appointments due to my new fears of driving & riding in vehicles. My life is now ruined by this accident. Decreasing va disability due to inability to attend appointments caused a $1000.00 per month loss of benefits. I can't afford my bills and have been struggling with the va to gain access to medical evaluations since they are now striving to cut benefits from anyone they can. Please recall now!!!!! Who else has to be hurt or killed?????

Filed Jul 26, 2014 · Brakes · 100,000 miles · NJ

Total brake failure. I went to apply my brakes and pedal went right to floor, luckily I had the presents of mind to use emergency brake.