My 2016 GMC Sierra has 44,000 miles on it. In the last 2 weeks I have had 3 occasions when traveling at very low speeds the brake pedal becomes stiff and requires both feet to depress enough to get the vehicle to stop. Even when completely compressed with my full force the vehicle continued to roll slowly. One time was in a parking lot and the other 2 times were at drive-thru fast food spots. Brake function seems completely fine at normal operating speeds. A search of the internet led me to find several forums with people describing the exact same situations. At low speeds the brake pedal becoming extremely stiff and cannot be depressed more than 1". I was lucky to be able to stop by putting my truck into neutral. If I had rolled out in cross traffic someone could have been killed. There are way too many stories exactly like mine all over the internet for there not to be a significant problem with the vacuum pump and or brake booster or some other brake system component on 2014-2018 GMC pickups and large SUVS.

- Sherwood, AR, USA

Vacuum pump failed and replaced at my own expense. Brakes would not depress, were very firm and truck continued to roll even with extra firm pressure on brake peddle.

- Irvine, CA, USA

Had to replace vacuume pump after intermittent brake failure at slow speeds with only 38,000 miles on the truck. Brake failure would occur without warning. Dealership diagnosed the issue after testing he vacuume pump, which was reading 6 psi. Was told there have been no recalls for this issue.

- Edmond, OK, USA

Several times I've experienced weak braking a different speeds or while shifting from parking. I also experience the brakes not fully depressing after I step on the brakes. I took my vehicle for a brake inspection thinking I may need new brakes and was told by the inspector that the pads are not the issue, he told me he has never seen an issue similar to what is going on with my truck and instructed me to take it to the dealership. When I contacted the dealership the service advisor told me that it sounds like I just need to replace the brake pads and rotors and told me that he doesn't believe there's an underlying issue based on what I was told at the other service center. Any issues with braking components should be addressed immediately by the manufacturer before people get hurt or someone is killed.

- Palmdale, CA, USA

Brake pedal rock hard and will not press down

- Kenosha, WI, USA

On multiple occasions, the brakes appeared to loose all brake booster function, causing incredibly weak braking at low speeds. Twice it failed in a parking lot situation, where the effect was minimal (just required pushing the pedal with maximum force I could generate) the most recent was a parallel parking situation where the brake failure almost cased a low speed collision. I missed the car behind me by mere inches!! I address this with the GM dealer twice and both times I received "could not duplicate" it will be noted again. This needs to be addressed via a recall as it is a major safety issue, and is not specific to my truck (this has been documented on the internet, and there is a tsb for it which mine supposedly was not part of) the problem is low speed, at idle manuvers where the brakes are replied repeatedly (like parking). I never noticed a problem at any speed above crawl

- Milwaukee, WI, USA

When backing into a parking spot at my residence. I pulled forward to straighten out and my break pedal got hard and would not come to a complete stop for a few feet after initiating stopping procedure. I almost ran into multiple vehicles. It was as if I was sliding on ice. I tried it a couple more times thinking it was a fluke and it persisted to continue with the same behavior. I even went as far as turning my truck off and starting it again to see if it was an electrical issue causing it and nope continued to do it. This is a huge issue that needs to be taken care of as I have read multiple complaints over the same thing.

- Rapid City, SD, USA

Brake failure - multiple time while driving my 2016 GMC Sierra, the pedal has gotten hard & will not stop the car. This generally happens after using the brakes several times quickly. The brake pedal will get hard & the truck will not stop. Luckily I have not been injured but the problem is very dangerous & I fear for my life while driving this truck. There is a technical service bulletin on the problem, tsb # pit5361C, however it is not a safety recall. How many people have to die before the NHTSA enforces a recall?

- Houston, TX, USA

The second incident on September 1, 2018: 2016 GMC Sierra 1500 Z71 4X4 cc I was speeding up to merge onto a busy highway in denver, headed to the mountains to take my wife and three boys camping. A car in front of us had began slowing down, so I began slowing down, they slammed on their brakes, so I slammed on mine. The only difference between our vehicles besides size was that they came to a complete stop, as soon as I slammed on my brakes, the truck just glided on the pavement as if it were a sheet of ice. The only thing to stop us was the back of their vehicle! we got a rental truck and carried on with our camping trip. As we drove past the accident scene slowly hours later to head back towards the mountains, (traffic was much lighter) we noticed that the skid marks from my truck were straight with no breaks in the skid lines, which to my knowledge indicates that the ABS system was not working properly. I never had any indicator lights show up on the dash. After that accident, my wife and I conducted a lot of research, come to find out that GM trucks had multiple complaints with their brakes, wish I had done my research first.

- Amarillo, TX, USA

In March of 2018, I bought my 2016 GMC Sierra 1500 Z71 4X4 used with 36,000 miles on it from crain Kia of conway, ar. The salesman started off by telling me that they didn't have anything I wanted, but of course when I was about to head out the door, he runs up to me and tells me that he found one that he thinks I would like, told me that they had lost track of it on their lot and it had been there for over 100 days. I liked what I saw, it was a good price, and it seemed like a mechanically sound truck. After about a couple weeks, I began to notice that I was having to pump the brakes just to stop, but didn't seem real bad at the time. The problem only worsened so I brought it by a local GM dealership and body shop to see if they could diagnose the issue, which of course they told me that everything was fine. I continued to drive it and when I wouldn't pump the brakes, they began gliding, almost like I was trying to stop on ice before they would actually come to a complete stop. I had two incidents' regarding this issue with the brakes within two months of each other. The first on July 7, 2018: I was at a stop sign, completely stopped. I was heading left at a three way intersection and there was a car turning right slowly onto the street that I was leaving, so I barely lifted my foot off the brake to make my left turn when the car decided that they were gonna go straight. I immediately slammed on the brakes, but the truck just kept going for another few feet until the brakes finally stopped me along with the other individuals car. I immediately had the brakes checked out again and of course nothing was found. I took it to a different body shop to have the bumper replaced and asked him if he could check it out, nothing turned up. To be continued.........................

- Amarillo, TX, USA

At low RPM, 's and at low speed the vacuum assist pump cannot supply enough assist pressure to the brakes, this does not let the power brakes work as they are designed. When this happens, mostly when backing a trailer up but also when going forward at slow speeds, there is no power assist brakes and a type of manual brake exists. This type of manual brake requires maximum leg pressure is required to slow down and/or stop, and when pressure is applied there is a time lag for pressure to be applied so that the vehicle stops.this same problem occurs with no trailer load involved and the vehicle is going slow. It is a dangerous situation when entering traffic at a perpendicular angle. Other complaints have been made regarding the same problem.

- Sterling Heights, MI, USA

The brakes on my 2016 GMC Sierra 1500 with only 31,700 miles exhibited a hard brake petal and the vehicle would not stop. This happend at slow speeds while attemping to stop in parking spaces and at red lights on local roads.most frightening was while back my truck and boat into a boat ramp the brakes would not stop the vehicle! I brought the truck to the local dealer who replaced the brake booster & the vaccum pump. I questioned if there were any service bulletins and I was told there were none. Fearing this could happen again, I searched on line and found other complaints effecting not only my make and model year but other GM/GMC models and years. I also found a Texas lawsuit where the plaitiffs experience was very similiar to mine. I contacted GMC customer support to lodge my complaint and requested an extension to my bumper to bumper warranty. I was instructed to contact my local dealer to purchase and extended warranty. They went on to say there are no service bulletins or recalls for this issue for my vehicle.... this needs to be investigated as I am of the opinion that this is a saftey issue that is not being addressed properly. A vehice with less than 32,000 miles should not be having this type of dangerous problem. I'm of the belief there is a defect somewhere that needs to be fixed based on the complaints I'm seeing from others online.

- Orlando, FL, USA

While driving at slow speeds the break pedal will not depress. The pedal seems to get stuck. When this happens it is difficult to come to a complete stop.

- Huntingtown, MD, USA

Brakes are hard to pres and cause the vehicle to not be able to stop. The problem occurs at low speeds when parking or at stop lights. Vehicle has 48K miles.

- Edmond, OK, USA

Vacuum pump failure. The truck had the vacuum pump fail after only 56, xxx miles. The pump failed and cause me a hard brake pedal while coming to a stop. The part internally failed and was not producing enough vacuum to supply the brake booster. After discussing this with the dealer it was a common problem and not covered by warranty.

- Winter Garden, FL, USA

When the peddles are raised and you step on the brake you could be pushing the gas and brake at the same time. When the peddles are lowered this does not happen. A lot of people step on the side of the brake and it happens only when raised.

- Strongsville, OH, USA