Low speed brake issue- braking effort increased considerably and vehicle and caused become difficult to stop. While parking vehicle in private parking lot the brake pedal became very firm with no take up and took considerable effort to bring the vehicle to a stop. Immediately brought vehicle to mechanic who informed me that the problem was failing brake booster and that it is a common defect with this make model of vehicle. Also informed me that the when the booster begins to fail can deposit contaminates in the oil system that can prematurely damage the engine. A internet search produced a long list of customer with similar vehicles describing their experience of similar issues. I called the local Chevy dealer and they also informed me that is common issue but there were no recalls or manufacture announcements on the vehicle so they would not reimburse for the repair. I contacted GM and they logged my complaint GM case #[xxx] but they would be unable to offer any repair assistance at this time. Will repair vehicle at my own expense. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Gaithersburg, MD, USA

The contact owns a 2015 Chevrolet Silverado 1500. The contact stated that the brake pedal became stuck while reversing out of the driveway. The contact had to apply more pressure to the brake pedal than usual to slow down the vehicle. There were no warning indicators illuminated. The dealer was not contacted. The vehicle was taken to an independent mechanic who diagnosed that the brake booster needed to be replaced. The contact planned to have the mechanic repair the vehicle this week. The manufacturer was made aware of the failure and provided a case number. The failure mileage was 44,000.

- Gaithersburg, MD, USA

The truck is intermittently hard to stop, I believe it is losing vacuum. I've had a mechanic look at the truck and they cannot find anything wrong. This is intermittent and I'm scared to drive the truck. This only seems to happen at low RPM. I believe this should be investigated because the issue could cause an accident. I'm a 235 pound male and I believe a smaller person would have even more trouble stopping with the sudden loss of vacuum. I read in a forum that others are having the same issue and I should file a complaint. Had it not been for the article that mentioned the NHTSA I would have never filed a complaint. I have to think there are others dealing with this issue and aren't sure where to turn or report the issue. Please help.

- Bowling Green, KY, USA

Driving newly purchased 2015 Chevy Silverado 1500 at 35-45 mph on freeway (which has a 65 mph speed limit). Traffic ahead was slowing down, and the brakes were pressed, speed was reduced, but when the cars in front (with at least 5 car lengths of space ) suddenly stopped, and I slammed the brakes, the brakes failed. I tried and tried pressing the brakes, but the truck didn't stop, and I rear-ended the vehicle in front of me, which ended up rearing the vehicle ahead of it, and so forth. Due to the brakes not responding, I was unable to stop like the rest of traffic, and thus, caused an accident. (note: The weather and road conditions were fine, not went road, as stated on police report.)

- Smith River, CA, USA

Brakes suddenly required much more effort to work. Happens frequently when applying brakes at low speeds, and occasionally when applied intermittently while slowing from 50-80mph. Examples of when this frequently occurs are: Entering parking spaces, stop and go traffic, approaching toll booths on highways, descending hills, and any situation where brakes are applied and released repeatedly over a short period of time. Condition can be very dangerous and cause accidents. I have needed to stand on brakes when stopping in many occasions to avoid accidents. Lately the condition had worsened and I did not feel safe driving the vehicle. Upon researching the issue I found many similar complaints from owners and survive bulletins from GM that include a large amount of affected vehicles. This should be a forced safety recall.

- Elkhart, IN, USA

Braking assist service warning message appeared on screen. Noticed braking assist is not working at low speed and idle. Requires significant foot pressure to have brakes work. No accident yet.

- Windham, ME, USA

I have a 2015 Silverado 1500 5.3 with about 90K miles. While I was parallel parking, after the 2nd pump, I realized the truck wasnt stopping. I had to use both legs to make it stop before hitting the car in the back of me and almost crushing a pedestrian. My brake pads and rotors are fine. I do hear an abnormal noise coming from the engine area at all times. Kinda like a bad pulley bearing or something. Noticed it the day the truck started acting up. I looked online on mutiple websites and understand this is a common problem with the vacuum pump, brake booster and master cylinder. This should be a safety recall.

- Springfield, GA, USA

When attempting to brake, I pressed the brake pedal with appropriate force only to find that there was a loss of brake power... I would equate it to 85-90% brake loss. I was able to apply pressure as hard as I could and the vehicle stopped over double the usual stopping distance. I did end up going through the stop sign and was thankfully not hit. I pulled over and restarted my truck, I applied pressure to the brakes and all normal pedal feel has been restored.

- Cloquet, MN, USA

At low speeds the brake pedal intermittently gets hard and makes it difficult to stop. It seems like there is no power brakes. Usually happens when parking. This has happened about 5 times.

- Dundalk, MD, USA

Brake pedal too hard..sometimes dont brake have to put both feet to brake

- Seeley, CA, USA

Brake vacuum pump failed while on the freeway causing brake pedal to be unresponsive almost causing major accident. This is listed as under investigation. There was no warning or light. Brake pedal instantly became stiff and could not be pressed down. Chevrolet fixed this by replacing only the pump. It's recommended the vacuum lines and brake booster be replaced too due to potential oil leakage which states will cause pump to fail again. Chevy did not replace additional parts for me.

- Valencia, CA, USA

When travelling at low speeds, the brake pedal pushes all the way to the floor and does not fully stop the vehicle. On 3 occasions now, I have had problems stopping the truck while parking, coming very close to hitting another vehicle.

- Kansas City, MO, USA

Brake suddenly became real hard and I couldn't stop the vehicle. I had to press real hard to get it to stop. I ran into the middle of the intersection at a red light fortunately no cars were close to that intersection at that time01

- Auburn, MI, USA

The contact owns a 2015 Chevrolet Silverado 1500. While reversing out of the parking lot, the contact attempted to depress the brake pedal; however, they failed to respond. When the contact made a second attempt, the brakes responded and the vehicle stopped. There were no warning indicators illuminated. The contact took the vehicle to an independent mechanic where it was diagnosed that the brake vacuum failed and needed to be replaced. The vehicle was repaired, but the failure recurred. The dealer and manufacturer were not notified. The failure mileage was 62,000. The VIN was not provided.

- Cedar Lake, IN, USA

Noticed hard brake pedal on top when stopping. Dealer tech said brake vacuum assist pump needs replacing. Less than 75,000 miles - not covered by warranty

- Livingston, LA, USA

When coming to a stop in traffic the brakes failed to stop my truck. I was going straight at a very low speed. The pedal felt like I was pushing on a brick. I did get my truck stopped and got it off the road. I called my dealer who said they had not heard of this problem but thought it sounded like a brake booster failure. I called GM customer service who started a case # 9-5055710889, they told me that the truck was out of warrenty. Upon further reading I discovered the tsb for my truck to replace the brake booster, master cylinder, line, and vacum pump. The truck is being repaired now. My truck has 41,000 miles on it.

- Verona, WI, USA

My truck brakes normally except when I stopped, then at low speed the truck fails to stop. I've almost gotten into multiple accidents (hitting walls, poles, a bus) and its even worse going downhill. It takes both feet and all my weight to get the truck to stop. Eventually someone is going to get into a bad accident because of this issue. Happens when going forward and reverse. I've read several articles about it on the internet and I've talked with GM techs and it's a bad problem with the vacuum pump. Please help!!!!

- Newcastle, OK, USA

When slowing down to park, I lost braking and could not stop the truck. I had to put the truck in park to stop the momentum. This happened going in reverse. When taken to dealer I was charged $470.96 for parts and labor at N the vacuum pump which provides power for braking and steering.

- Chesapeake, VA, USA

While at low speeds mostly backing my vehicle loses braking. The pedal goes to the floor however the vehicle continues to roll.

- Pratt, WV, USA

Vacuum pump on 2015 Chevrolet Silverado 1500 went out while driving on highway on July 8, 2018. Applied brakes and they were hard and would not depress. They eventually started to work so I was able to stop. This occurred off and on for over two weeks, usually at slower speeds, until I was able to get them fixed on July 24, 2018. See repair order. I wanted to file this because I saw the NHTSA was investigating faulty brake vacuum pumps and mine was not repaired at a Chevrolet dealer.

- Shoreview, MN, USA