While driving in stop and go traffic on a city street moving straight forward and inching the brakes to move with the traffic flow I noticed that the brake pedal got very hard and the vehicle was continuing to move forward even though I had all my weight pushing on the brake pedal lifting myself off my seat this happened 3 times before I was able to reach adequate parking. I have taken the vehicle to a certified GM service shop and after inspection they instructed me that I would need to replace the brake system vacuum pump, the brake booster, brake master cylinder and the tubing connecting the items. Resulting in a $1170 repair and the service rep also stated that this would take care of the issue but cautioned the oil and filter changes needs to be maintained according to the manufacturers standards. I have owned this vehicle about fifteen days as of this writing I did by it from a dealer whom said he was unaware of this issue. Why is the NHTSA or whom ever continuing to let the dealers sell theses vehicles with a known safety problem without addressing the proper repairs stated in the tsb pit5361B that GM has sent out to there service centers. Serious accidents could and should be prevented with this issue.

- Larue, OH, USA

I was parking and almost hit the car in front of me because the brakes weren't working at low speed. Vacuum pump failure.

- Montrose, MN, USA

As I was driving in traffic my brakes became so hard to push that I could not successfully get it to stop effectively without using my body's weight to try and depress the brakes. I still couldn't get it to stop correctly. Then I was in stop and go traffic and almost rear ended someone. Happened many times more before I could get it in to be fixed.

- New Milford, PA, USA

Brake pedal becomes hard to press at times. Pedal must be pressed hard to the floor in order to stop. Occurred 02/14/19, on a few occasions while driving on the road and almost caused an accident. Also occurs when letting foot on and off brake pedal multiple times. Almost feels as if no braking power at all, unless pressed hard to the floor.

- Ashburn, VA, USA

Brake pedal becomes rock hard and nearly impossible to stop when driving at low speeds or on an incline

- Plainfield, IL, USA

My 2016 Chevrolet Silverado brakes become very stiff when braking at low speeds. This has happened on 3 seperate occations. I have to physically use every ounce of strength I have to press the brakes to stop the truck. On two occations I almost hit another car but stopped just inches away. My truck has been taken to pep boys and brakes plus in denver, co. Both companies cannot find anything wrong with the truck. I've read that there is a lawsuit against GM for this problem and it seems to be very common.

- Denver, CO, USA

Brake pedal becomes hard with little to no brakes a low or idle speeds.

- Brunswick, GA, USA

At low speed my brakes seem to have failed. The brake pedal is very hard and I almost drove into oncoming traffic.

- Houston, TX, USA

Lose brake assist(?) upon sitting with foot on brake @ stop light/parking lot. Pedal becomes hard and will not stop. Has not happened @ speed. Had repaired, said was vacuum pump malfunction-$600. Have read of other reported malfunctions of same style.

- Garland, TX, USA

I was driving in stop and go traffic on the highway at low speeds. When I applied the brakes, the pedal was very stiff and I had to use excessive force on the brake pedal to stop the vehicle. I almost hit car in front of me. Chevrolet dealer diagnosed a bad vacuum pump and replaced it under warranty. This malfunction is a serious safety issue.

- Rochester, NY, USA

Brake pedal very stiff with little to no braking power. Happens at low speed both in forward and reverse. Already had vacuum pump replaced on 01/25/2019. Same issue again on 01/29/19. Taking back to mechanic.

- Wetumpka, AL, USA

Same problems others are having with breaking, breaks get hard and go to floor, when trying to park or backing up to a parking space. Not sure why there is no recall for this issue it's a big safety concern.

- Santa Fe, NM, USA

Brakes became incredibly hard and almost did not stop my truck three times now. Finally, this last time the service brake assist light came on. I have previously taken my truck to the dealer twice and they saw nothing wrong with it. I am hoping they will now that the warning came on. I have come very close to hitting other cars because of this and hope it can be fixed. This happened every time as I was parking my truck at very slow speeds (thankfully).

- Side Lake, MN, USA

At low speeds the btaking system is extremely hard to engage and creates a need for an umexpected longer stop distance/time. This is an extreme hazard and can easily cause an in incident and possible injiury/fatality. It gives a 'brake assist error'when this occurs.

- San Angelo, TX, USA

I was backing out of my driveway when I tried stopping to shift into drive I pressed brake pedal and truck kept going almost hitting a parked car I felt a vibration in brake pedal and it felt hard to press truck has about 29K miles

- Santa Ana, CA, USA

During slow traffic situation brake pedal becomes extremely hard and difficult to depress with loss of braking to the point of almost causing an accident.

- Graceville, FL, USA

The brakes become hard and resist depression, or require an increased effort to depress the brake pedal but with no stopping ability, if you tap or press the break. Example in traffic or reversing out the driveway.this seems to happen at 20 mph or less. I did have an issue the other day when I had to slam on the brakes, pressing the brake all the way which hard to do and made all kinds of noises. This has been going on since 2017.

- Cypress, TX, USA

Lose power braking ability in stop and go traffic and at slow speeds. Two pedal depressions and brakes become virtually unusable. Suspect faulty brake vacuum.

- Glendora, CA, USA

While driving at slow speeds such as parking or backing up, I frequently experience a very firm or hard brake pedal. This results in very little braking ability. The problem is beginning to become noticeable while driving in traffic which leads me to believe the problem may be getting worse. I have taken my vehicle to a maintenance shop where it was diagnosed as needing a vacuum pump for the brake system. The parts needed for the repair are on backorder and it is not known how long this may take. Due to the problem becoming more frequent I am currently not driving my vehicle until repairs can be made.

- Springfield, MO, USA

The brakes became really hard to press and I almost crashed into my garage. This seems to only happen at slow speeds but is getting worse. The "service brake assist" light came on. It is believed to be a failure in the vacuum pump.

- Otsego, MN, USA