The brakes periodically do not work at low speeds. The brake pedal gets hard to push to the point you have to stand on the brakes to get the vehicle to stop. I haven't gotten in an accident yet but it's been very close twice now where I've almost hit a car in front of me at a stop sign.

- Walkerton, IN, USA

Hard brake pedal at low speeds especially while towing or traveling on inclines. Brake pedal becomes hard to decompress without warning and vehicle is unable to be stopped.

- Brunswick, OH, USA

My 2015 GMC Sierra failed to stop at low speeds today. I avoided the collision by pulling off the side of the road. The peddle was extremely hard to push. I received a notice by GMC that its the vaccum pump and they will only cover the warranty up to 72K miles. My truck has 72,560 miles.

- Corona, CA, USA

Brake vacuum pump: While attempting to stop, the brake pedal became very firm and the vehicle was difficult to stop. The vehicle continued to move while depressing the brake pedal and required a substantial amount of effort to make the vehicle come to a stop. It was intermittent, but it did occur several times on the day I first noticed it and was often at low speed. Fortunately I was not involved in any accident when this first occurred. I was able to drive it to the nearest dealership immediately and had it repaired that day. The dealer was able to duplicate the issue and determined the vacuum pump to be defective and required to be replaced. Once replacing the vacuum pump, the brakes performed as expected. Attached is a copy of my invoice with the dealer narrative describing the repair.

- Lake Orion, MI, USA

Low speed brakes hard and takes time to slow and stop. Brakes seized backing down driveway 2xs. Got notification from GMC that they are aware the vacuum /power my be defective and if you experience this problem the dealership would fix it at no cost but ot had to have less then 72,00 miles. Drop it off at our dealership and they claim no problems found. They had for 3 days and just drove it around with a computer hooked up to it. Said no codes came up so they are not bothering with it. Pick it and still the same. Husband went back. They don't want to bother cuz the milage is over 72,000. We have 75,000. I am afraid to drive it. They need to be recalled for the vacuum /power brake issue. Our truck is only 4 yrs old and we paid big money for it. We live Chevy/GMC. We would never own anything else. Recalk is needed.

- Monson, MA, USA

After coming to a stop or reaching slow speed, the brake pedal becomes firmer with each pump until the pedal only moves roughly an inch before stopping, and braking force is barely enough to keep the truck from idling forward. When this happens on a downward slope at a stoplight it requires massive amount of force on the brake pedal to keep the truck from rolling into the car in front of it. Also, if traffic begins to move after a stop and then stops again abruptly without gaining much speed, the same thing will occur and it is extremely difficult to not hit the rear end of the car in front. After doing some research this seems to be a common issue with the vacuum pump. I will be visiting a dealer soon. 2015 GMC Sierra slt with 57,000 miles.

- South Bend, IN, USA

I after pulling into a service station, I was backing up and suddenly had no brakes. I almost hit another vehicle.

- Atwater, CA, USA

Hard to no braking at low speed. Power brake assist failure.

- Troy, MI, USA

Increased / inconsistent brake pedal effort at low speeds; truck takes more effort to stop, increased breaking distance

- Hiram, GA, USA

Brake pedal becomes hard and non efective when attempting to park or at low idle speeds on numerous occasions nearly causing serious harm to bystanders and property. This is a major problem with GM trucks and do not know why a recall has not been issued to protect the public from serious injury.

- Greenville, NY, USA

Brake failure at parking lot speed. While reversing in truck, brakes became hard and failed. Almost hit another vehicle.

- Pottersville, MO, USA

Hard pedal, extremely poor braking response while slowing and during parking of vehicle, especially when multiple pedal pumps are required. Progressively worsening over past 6 months. I replaced vacuum boost pump and problem was corrected.

- Hillsboro, VA, USA

At low idle the braking become very stiff and extreme pressure on the brake peddle is need to stop the vehicle. Hank graff of durand mi indicated it is due to a failed brake assist vacuum pump. The service rep. Also experienced the issue when they pulled the vehicle into the repair bay. As the owner, I have experienced this braking issue multiple times.

- New Lothrop, MI, USA

The contact owns a 2015 GMC Sierra 1500. While driving 50 mph, the brakes failed to respond and the contact lost control of the vehicle. The contact drove on the shoulder and was able to park in a rest area to inspect the vehicle. The contact drove the vehicle back home. The vehicle was taken to mcgovern Buick GMC (located at 2806, 150 turnpike rd, westborough, MA 01581, (508) 439-4362) where it was diagnosed that the vacuum brake pump needed to be replaced. The vehicle was not repaired. The manufacturer was not aware of the failure. The failure mileage was 102,000. The VIN was unknown.

- Somerville, MA, USA

While pulling into a parking lot my brakes failed to stop my truck twice. The brake pedal was very stiff, like it was a manual brake and not power. Had to depress brake pedal very hard to get my truck to stop. I shut off the engine and then restarted and the brake pedal returned to normal.

- Litchfield, MN, USA

At first the issue started as I was parking in reverse, pressed the brakes and the truck did not want to stop until I put a lot of pressure on the brakes. Then pulled forward to check and it did the same thing so I parked the truck and left it overnight. It worked fine in the morning and the next few days. Then it happened again after about a five hour drive home from work I exited the freeway exit 99 in tumwater the brakes got really stiff and was not slowing quick enough for the stop sign coming up, I slowed to about 35mph then realized it wasn't gonna stop so I pressed the brakes as hard I could swerving just past the stop sign until it stopped. Preceded slowly got some fuel and still had about another hour drive home and now the brakes was really stiff and truck would not stop unless I put a lot of pressure on the brakes. So I got back on the freeway going only about 55 mph increasing my stopping distance crawling all the way home having press the brakes extremely hard when I needed to stop for traffic lights. Now I'm afraid to drive the truck anywhere without fearing of the brakes not working at all completely.

- Puyallup, WA, USA

Brake pedal won't go down and is stiff. Brakes don't react.

- Hermitage, TN, USA

Brake booster vacuum faulty. Causing a near miss in drive thru almost rear ending another car. Vacuum pump faulty.brakes become hard to push and get no response. This is a very dangerous. GM needs to have a re-call before people get killed. It is a known issue lots of the same complaints.

- Locust Grove, VA, USA

Break pedal at low speeds locks up completely.

- Georgetown, KY, USA

Brake vacuum pump. At slow speeds my brakes almost don't seem to work. I'm sure it's the same problem I've read about.

- Saint Charles, MO, USA