The contact owns a 2015 GMC Sierra 1500. While backing out of a parking space, the contact depressed the brake pedal, but the vehicle did not stop. As a result, the contact struck a parked vehicle. A police report was not filed and there were no injuries. The vehicle was taken to an independent mechanic who determined that the brake vacuum pump was damaged and needed replacement. The dealer and manufacturer were not notified of the failure. The vehicle was repaired. The approximate failure mileage was 48,499.

- Tylor, TX, USA

Brakes failed. I was backing into my garage and the pedal became really hard to push. I almost did not get stopped before I hit the wall.

- Pleasant View, TN, USA

Yesterday afternoon while backing out of parking spot, my brakes became unresponsive. The pedal was extremely hard to press and would not stop the vehicle. The result was the vehicle rolling down an inclined parking lot and hitting another vehicle. Normal braking had resumed when leaving the accident. This is the second time for the brakes to become unresponsive at low speeds. Approximately 1 month ago the same situation happened driving through a parking lot. Brakes became extremely firm and unable to stop the vehicle. No damage resulted from that incident. After reading several message boards, it appears to be a widespread issue with this vehicle that results in replacement of multiple power braking components. I currently feel extremely fortunate that my brakes did not fail 5 minutes earlier while picking up my child from school.

- Maumelle, AR, USA

Brakes failed to reser at low speeds, resulting in near collision. Brake pedal became stiff and unresponsive. Has also happened previously, was told brake vacuum pump failure is the cause. Was notified this does not qualify under vehicle warranty despite reading of multiple reports of failure, technical bulletin release, and immediate safety issues.

- Falls Church, VA, USA

The contact owns a 2015 GMC Sierra 1500. While driving 1-10 mph, the brake pedal was difficult to depress and failed to stop the vehicle. There were no warning indicators illuminated. The local dealer and manufacturer were not contacted. The vehicle was not diagnosed or repaired. The failure mileage was 80,000.

- San Antonio, TX, USA

Backing up the truck the brake pedal became hard and the truck would not stop like I lost power I almost hit my dog and the garage it was very scary

- Escondido, CA, USA

Vehicle's brakes become stiff at low RPM causing difficulties stopping.

- Goose Creek, SC, USA

On several occasions slow driving in parking lots I have lost power assist braking and almost hit a car parked in the spot in front of me. I have read online about the issue with the brake vacuum pump and am thinking that is my issue. My brake pedal after a few pumps will get super stiff. On every occasion that this happened it was slow moving adjusting into a parking spot and had pumped the brakes several times. The pedal then becomes still and pushing the brake pedal does not get the braking power as expected.

- Macomb, IL, USA

While driving at slow speeds if you tap the brake pedal it won't depress and the truck will keep rolling. This happens when I'm trying to park usually. I was backing in my driveway and it didn't stop after taping the brake pedal 3 times. I hit the telephone pole with rear bumper which bent the body of the left rear fender enough to cause the tailgate to not open. My GMC dealer replaced the faulty booster pump for $1029.35 and I had to rent a car for 2 days.

- San Carlos, CA, USA

Brake vacuum pump booster. First started when driving under 5 mph. The brakes were hard to push down and would not stop the truck properly. Did this for approximately 3 months. Then driving getting off the interstate and applied brakes going 60 mph the brakes would not work. Could barley stop. Same issue has when driving slow. Now the brakes will not work at any speed. They truck is undrivable until it gets fixed.

- Prairieville, LA, USA

At low speed and on a number of occasions, the brakes have seemed to lose power and it required a lot of brake pressure to stop the vehicle and avoid hitting another vehicle, my garage, etc. It had been happening intermittently over the past month or so. Went in to the dealer and they replaced the vacuum pump at a cost of approx $600.

- Scottsdale, AZ, USA

Very difficult to stop the truck while going at a low rate of speed 5 to 10 mph. Had to forcefully apply pressure to the brake pedal to get it to stop still required more stopping distance. Brakes did not become fully functional until after placing the vehicle in park and shutting the vehicle down waiting for approximately 15 minutes. Restarted the vehicle and brake were functioning properly. This event occured at approximately 46,000 miles on the vehicle. Following day brought the truck into the local GMC dealer and verified that the truck has a braking problem found a leaking brake booster and master cylinder.

- Port Angeles, WA, USA

Vacuum pump failed at 58000 miles. Lost brake assist at parking lot speeds. Could have caused an accident.

- Fontana, WI, USA

The brakes at a low rate of speed (1-10 mph) partially gives out which prolongs the stopping distance of the vehicle. It seems as though the ABS kicks in but for no reason. Must strongly push down on the pedal to get vehicle to stop, which still requires additional stopping distance. Has occurred sporadically from mid-2018 to March 2019. No resolution through dealership.

- West Point, NY, USA

Brakes completely failed. Replaced brakes on all 4 wheels, but to no avail. Then replaced the master cylinder and still no brakes. My fence pole and mailbox stopped my vehicle.

- Albuquerque, NM, USA

When I first got the truck the brakes operated perfectly fine after about three days the brakes on the front of the truck would lock up while I was driving and would not release. After two sets of calipers two sets of brake pads a set of rotors a two weeks go by with the mechanic trying to figure out what is wrong with this truck. They then replace the brake master cylinder, there was no improvement. Turns out to be the brake booster had failed along with the hydraulic ABS control unit. There were no warning lights on whatsoever the whole entire time the brakes were locked up the ABS light didn't come on until the brake booster was replaced indicating that the ABS control unit was also bad. Now I am experiencing a ticking coming from the engine. The ticking occurs at idle end as the throttle is being activated. However the local dealership has refused to give me any information as of why it could be making this ticking noise or is just unwilling to say anything.

- Paw Paw, MI, USA

I pushed on the brakes when slowly pulling into a parking spot and the brakes got squishy and barely stopped before I hit another parked car. This happened a few times before I got the vehicle home. Then a message popped up that said "service brake assist system". I took the truck in and they said they would need to replace the vacuum pump and 2 belts.

- Collinsville, OK, USA

Brake assist warning light came on with hard brake pedal at low speed braking. Does not happen ofter. Brought to dealer and had tested with no trouble found. Dealer said no recalls or service bulletins on issue.

- Metairie, LA, USA

Brakes not working. Had to replace the vacuum pump belt, brake booster vacuum pump, and ac belt. Cost $573.86. Vehicle only has 40K miles. Very dangerous, vehicle would not stop when applying brakes

- Berkley, MA, USA

At low speeds breaking becomes extremely difficult leading to longer stopping distance.

- Northglenn, CO, USA