Brake pedal gets very hard while in traffic especially while towing a trailer. Dealer initially couldn't find an issue but eventually replaced the brake vacuum pump, it got better but still intermittently does it. When it happens you have to stand on the pedal with everything I have to get the truck to stop.

- Bethel, CT, USA

Noticed brakes seemed to stop working properly at low RPM.happened while backing out of driveway. Also while sitting in traffic at redlight.

- Dothan, AL, USA

2015 Silverado 1500, 4X4, 41,000 miles on odometer. At slow speed on city street driving straight (under 5mph), complete loss of all power assistance of brakes. Driver needed to apply extreme manual pressure at pedal to get the vehicle to stop and not roll into the car in front of it. Immediately parked, came back issues persisted in parking lot, but then went away when after speed of approx 10mph reached. No warning lights or display indicators triggered during incident. Issue has not occurred again. (approx 70 miles since issue first occurred)

- Novato, CA, USA

I applied the brakes firmly for a car stopping short unexpectedly on the highway. I released the brake for a second or two to allow room for the car behind me to stop in time. When I reapplied the brake the second time, there was little to no braking action. The pedal did not more and did not travel all the way to the floor. There was no power assist. I was able to recreate the problem later at low speed when there was no traffic. I brought the truck to the dealer who could find nothing wrong but replaced the brake vacuum pump. The condition has not re-occurred since the repair was made in May. I have included a copy of the service invoice. I am reporting this because I see on the news you are investigating brake issues.

- Mansfield, MA, USA

Brake pedal becomes very hard and brakes ineffective if the pedal is pushed and released at idle. Brake do not start working properly again until the accelerator has been pressed. "service brake assist" message is displayed on the diagnostics screen. Definitely a problem with the vacuum pump.

- Mapleton, ME, USA

At low speeds my brakes are very hard to press. The pedal gets really tight and will not press down. The longer you try to press the tighter they get. The truck will barely stop before I almost hit something. Does not do it every time, but it seems to be more frequently. It seems to happen when I go from a stop, then accelerate slowly and then try to slow down to a stop (ex. When parking).

- Salem, NH, USA

At low speeds I have no breaks and the pedal is rock hard. Zero to 1/4' of movement and the truck will not stop. I nearly hit someone.

- Huntington Beach, CA, USA

While backing up when brakes are applied the pedal has very little travel and is hard to push down causing vehicle to continue backing with little stopping power or effect. This takes effect only when backing after restarting vehicle. System checked at Firestone tire center and result indicated brake vacuum power was not working properly. This occurs almost daily when backing up.

- New Smyrna Beach, FL, USA

Having issues with braking at slow speeds, specifically during backing up. When I took my truck into the dealer for routine oil change I had them look at the braking problem and was told my brake vacuum pump is going bad. I saw an article about this same issue being under investigation for possible recall and wanted to make sure my voice was heard.

- Calhoun, GA, USA

Brake pedal becomes unresponsive and soft at times, and other times feels like the brakes are not releasing all the way making it pull left/right randomly and very hard to control. Occasionally the ABS activates while not moving/parked just by by holding brake pedal. Also found oil of some kind in brake fluid during routine flush. Vacuum pump makes quite a bit of noise.

- East Troy, WI, USA

I was coming off a hill and trying to brake before making a turn onto another road. The brake pedal would not depress, felt very hard and I was unable to stop the vehicle. I took the truck to a garage and was told it was a fault in the brake vacuum booster and master cylinder. I will attach the invoice for the parts. The truck is still getting fixed and do not have an invoice for labor yet.

- Lavalette, WV, USA

While backing up from drive way tried braking to stop and truck continued to travel almost hitting a vehicle that was parked on the street. The next day before taking the truck to the dealer to have it inspected made a stop at the gas station and again the truck would not stop. Dealer diagnose bad vacuum pump and oil in brake booster and lines, all needed to be replaced costing over $1,300 dollars.

- San Juan, TX, USA

During stop and go traffic or repeated braking applications my truck loses braking power. Seems to be a vacuum issue. Almost had a collision in a parking deck.

- Jefferson, GA, USA

I've noticed a big decrees in breaking performance in the past month doubling the distance it takes to completely stop and it's almost caused me to rear end a few people.

- Vienns, IL, USA

Loss of braking at idle speed brought T ok desler ghey replaced multiple components extended warranty covered all but $100

- Duluth, MN, USA

I was driving in rush hour traffic and I went to hit my brakes and the pedal was hard and the truck would not stop. I put my flashers on and went very slow to the next exit. I went to park the truck at the hotel I was staying at shortly after exiting highway and as I was in reverse backing into a parking spot again the truck had a hard brake pedal and would not stop. I didnt hit anything thank got but it scared me pretty good. I carpooled with a coworker for the rest of that week while we were out of town for work. I ended up driving the vehicle home about 3 hrs away Friday evening and had no problems with the brakes. I have not driven the truck much since this has happened and since I had seen many others have had the same problem. The truck goes into the dealer 11/27/18 and hopefully they will replace what needs replacing. I bought this truck 9/26/18 with 21,000 miles roughly and the truck now 25,773. The truck is a certified pre own vehicle if that matters.

- Albany, NY, USA

Noticed failure of vehicle to stop. Lack of power assist braking at slow speeds. Brake pedal is rock hard with little to zero travel (1/4' at most). Vehicle will continue to move (regardless of pressure applied to brake pedal) for several feet. While this has occurred in both forward and reverse gears; the issue is consistently observed in reverse.

- Youngsville, LA, USA

Just experienced brake failure while backing into parking space at low speed truck has just turned 40,000 miles. Brake pedal was hard to depress as if the ignition was turned off. Not the case engine was running and brakes were applied with extreme pressure and finally was able to stop vehicle before I bounced off of curb. I understand Chevrolet is aware of this and there is some class action law suits out there. A tsb has been issued but, from all the forums I have read this does not correct the problem. I will take into dealership as soon as possible if it don't kill me first. Help

- Lagrange, GA, USA

I brought my 2015 Chevy Silverado 1500 to a local repair shop as my brakes were not functioning properly. Stopping required very forcefully depressing the brake pedal to stop. On November 7, 2018 the repair shop contacted the local Chevy service manager to determine if there was a recall on the vehicle given that the vehicle is a recent model with limited mileage. It was determined that master cylinder and brake booster were defective and needed to be replaced. After taking a lengthy drive the vehicle had same brake problems making it extremely difficult to brake going down a hill. The vehicle was taken back to the local auto repair on November 15th. Repair shop called local Chevy dealer and spoke with parts manager to see if there was a recall on recent model Chevy Silverado as they had a 2016 Silverado in there shop same day for same problem. Chevy dealer parts manager indicated there was not a current recall but they did notice an issue as they had sold 10 ABS pumps in just one week! the local repair shop replaced the ABS pump. The defective brake equipment placed my family at risk and cost me more than $900. Most importantly this defective brake equipment in the recent model Chevy Silverado is a significant safety issue. Had there been a need to stop quickly I feel confident I would not have been able to avoid a collision.

- Hemet, CA, USA

When pumping brakes to stop, on the second to third pump the pedal gets rock hard and vehicle very difficult to stop. Loss of vacuum pressure seems to be the issue. In the GM dealer now, telling me the vacuum booster defective

- Fredericksburg, PA, USA