I was driving down I20 in dallas in rush hour traffic, the traffic was heavy but moving at 70 miles an hour. I saw brake lights in from of me, when I pressed the brake to slow down the brake pedal was hard, I could not press it with one foot and I could not slow down. I finally was able to slow down by putting both feet on the pedal with all my weight it felt like it was forever before I was able to slow down. I thought I was going to be unable to stop.I drove another 15 minutes going very slow and scared. Parked my truck in the drive and had a tow truck pull it to the dealership closest to my house. My truck only has 58,000. I really was scared for my life if you have ever driven in rush hour dallas traffic you understand. I could have lost my life or be seriously injured. The dealership told me today they had not heard of this issue. The dealership said they doubt GMC can do anything about the problem. The service department said was a vacuum pump on the breaks. I looked on line and others have reported this same issue. I could have been killed. Still shaking over the incident. I hope this problem is addressed before someone is killed

- Mesquite, TX, USA

Brakes loose boost at idle after towing trailer. I towed a heavy trailer and then dropped it in my yard. When I went to move my truck down my driveway and into my garage I had no brake boost unless I revved the engine.

- Grandville, MI, USA

I was following my daughter who was exiting the gas station and pulling out onto route 149. As she pulled up to route 149 she stopped to check traffic. I was behind her in my 2015 GMC Sierra 1500, going approx. 2 mph. When I hit the brakes, nothing happened. The truck kept moving forward and I hit the rear of my daughters car, cracking the rear bumper. No damage to the truck because I was only going a couple mph, luckily my daughter had her foot on the break of her car, otherwise I would have pushed her right into oncoming traffic. The fact that she had her foot on the brake is what stopped my truck. We both backed up and got out of the intersection, when backing up the brakes worked fine. There wasn't a spot to leave the truck so I had to drive 3 miles back to my house. The brakes worked perfectly after, no issues what so ever. It seemed like at the slow speed that brakes didn't have any boost (or pressure), the pedal was very very stiff, it felt like it was pushing back against me when I hit the rear of my daughters car. But driving home everything worked perfect. I'm bringing the truck in (approx. 72K miles) to have it looked at but I'm concerned the dealer will not know what to fix as the issue seems to be intermittent. This was a very dangerous intersection and I could have pushed my daughter into oncoming traffic and the result would have been much much worse. Something seems to be seriously wrong with the brakes and when googling this issue, I found many similar issues/complaints regarding the brakes.

- Moodus, CT, USA

Takata recall when backing up brake pedal is not at its normal pressure seems to be all the way down so have to press brake harder to stop the truck when I shift to drive forward same thing applies. After truck has been off for some time parked then start to drive brakes seem to be working fine.

- Pearland, TX, USA

Brakes became hard to depress and engage while vehicle was moving. Almost crashed vehicle. Afraid to drive. Brought to dealer. Said it was bad brake booster. After doing some research, found out should replace vacume pump, master cylinder, hose line, etc., so I did. 44K miles, 3 year old truck, happened on /12/10/17 brought to dealer garber GMC in Florida for $1300 repair on 12/11/2017. No warning signs when this happened. Very dangerous when brakes fail while vehicle is in motion.

- Port St. Lucie, FL, USA

I was pulling into a parking spot at work (slow speed) and I could not stop the truck. I kept applying more and more pressure to the brake pedal and it did not stop the truck. The truck hit the curb and stopped, luckily there wasn't a another car as I would have hit it. It caught me a bit off guard as I was trying to figure out what just happened. I backed the truck up about 10 feet, brakes worked fine in reverse, and pulled forward back into the spot. Again, the brakes did not work and I again I hit the curb. No damage to the truck, but brakes did not work. It felt like the brakes were pushed back against me. Brake pedal never went to the floor, I pushed the pedal and there seemed to be more resistance than normal. It didn't matter how much I pushed, the truck kept moving forward. This happened with approximately 78,000 miles. I was late for a meeting so I went into work and later in the day I had a break so I checked on the truck. Pulled out of the parking spot and back in and brakes worked both in reverse and in forward. So now what to do"???????" at work I did a quick google search and saw this similar issue come up in a lot of the search responses- and decided to log it here. This is a huge issue and very dangerous if I was in a crowd or people or at an intersection and couldn't stop. I called GMC and they said they never heard of anything like this- they didn't seem to care, they said if I brought the truck in they would see if it happened again.

- Moodus, CT, USA

We want to report a safety feature in 2015 GMC Sierra 1500. We bought a vehicle brand new and it currently has about 40,000 miles on the odometer. On 11/4/2017 after we got off the interstate 10, the break from this truck stopped working, we had a difficult and dangerous time to make it stop, and was lucky to manage to get into a store's parking. We have to haul it to the local GMC on Monday and found out the break pump was bad. This problem could cause a deadly accident if we were still in the freeway. We called GMC to report the problem and they said there is nothing they can do. This problem is serious and need to be addressed.

- Pensacola, FL, USA

Out of no where, I had to use extreme pressure on the pedal to stop the truck. The brakes began to sound rough. I turned the truck on and off hoping that would fix the problem. It didn't, I took it into my GMC dealer to find out that the vacuum pump has failed for the brakes. I did my research online and noticed many people have had the same issue. I was surprised there isn't a recall on 2014-2016 GM vehicles. This is dangerous and I'd hate someone's brakes failing at high speed and someone gets hurt.

- Clarksville, TN, USA

2015 GMC Sierra - braking becomes very difficult at idle speed whether moving forward or reverse. Brake pedal becomes very difficult to depress. Vehicle will move a few feet until completely stopped even with forceful pressure on the brake pedal. Appears to lose all vacuum/power braking ability.

- Weston, FL, USA

At 47,000 miles. I noticed a slight vibration in the front end while braking on the highway. Over the next 2 weeks the vibration became considerable worse. It felt as though the rotors became warped which I have experienced during vehicle testing at previous employments. I replaced the front brake rotors and brake pads. During removal of the old brakes, I quickly noticed that 1 of the 4 pads was completely corroded through the backing plate. Brake pad contact area with the rotor was fine, but the backing plate had holes in it from the level of corrosion. Other 3 brake pads were fine, very minor surface corrosion at worst. Since replacing my brakes the vibration has never repeated.

- Clarkston, MI, USA

Brake pedal does not depress easily at low speeds. Extream effort is required to push brake pedal enough to get vehicle to stop.

- Langdon, NH, USA

Takata recall. The contact owns a 2015 GMC Sierra 1500. The contact stated that the brake pedal was difficult to depress. The contact had to apply extreme force to the brake pedal to ensure that the vehicle came to a complete stop. The vehicle was towed to a dealer (covert Chevrolet Buick GMC bastrop, 702 tx-71, bastrop, tx 78602, (512) 303-2311) for further inspection and diagnostic testing. The vehicle was not included in NHTSA campaign number: 14V339000 (steering, service brakes, hydraulic). The manufacturer was notified of the failure. The vehicle was included in NHTSA campaign number: 16V651000 (air bags, seat belts). The approximate failure mileage was 29,004. Parts distribution disconnect.

- Grangerland, TX, USA

I was in a parking lot (thankfully) when the brake pedal was hard to push, and the truck did not stop immediately. There is a technical service bulletin issues for this problem pit5405B.

- Wildwood, MO, USA

Backing boat down boat ramp (not a steep ramp) in trailer mode, braking did not stop vehicle. Pumped pedal several times, used lots of force on pedal. Because of slow speed and increased effort, the vehicle did stop. Pulled forward and repeated at slower reverse speed and same poor braking. Dry conditions, brakes dry, did not put rear wheels in water. Have not had a repeated event. Dealer indicated that service bulletin pit5361B applies, but because of mileage it is not warranty. This should be a recall.

- Covington, LA, USA

Brake failure while towing a 3500 pound boat. Vacuum booster system failure. I was moving slowly through a parking lot pulling my boat, when I pushed the brakes the truck did not stop. The brake pedal bottomed out and the truck and trailer continued to move forward slowly

- Kernersville, NC, USA

On 2/5/2017 while turning unto my street the steering wheel locked and I could not move my truck from hitting a block wall. I also tried breaking but the car did not stop in time to not hit the wall. I was driving slowly (20 mph) because I was in a neighborhood and me and my family were all wearing seatbelts so no one was seriously injured. The airbags did not deploy at all. And I also bent the steering wheel in half trying to move it. I am attaching a picture of the steering wheel itself and the vehicle is currently at caliber collisions for the repairs. I went to the GM dealer and they said they would run diagnostics after the truck comes out of the shop.

- Moreno Valley, CA, USA