In stop and go traffic on highway at low speed experienced brake pedal stiffening and difficulty stopping. Reoccurred several times during same traffic pattern but only at the low stop and go speed. Problem occurred with no warning. Brakes worked as normal under other circumstances. Forum research suggested this was a vacuum pump and occurred to other models of same year and millage. Vacuum pump (internal) failure was confirmed issue by gm dealer and replaced. Mileage when problem occurred was approximately 47,200 miles. Vehicle in good condition, no wrecks ,regular maintenance, and not used for towing or heavy hauling.
2015 GMC Sierra 1500 brakes complaints
Page 8 of 9: complaints 191 to 220 of 229, newest first, as owners wrote them.
I first noticed the issue on the morning of saturday, november 10th as I was backing into a parking spot. As I was backing in, I noticed all of a sudden the brake pedal was on the floor and I was about to plow into a curb and threw the truck in park. I didn't think anything of it. The second time it happened was one day later as my fiance and I had just completed a 200 mile drive home. I was pulling into the parking lot at our townhouse complex and as I was pulling forward to back into the space, I noticed I had no braking power whatsoever. I had to throw the truck in park to keep it from hitting a neighbors vehicle. I opened the hood with the engine running, and noticed a ticking noise I hadn't heard before and my brake pedal only had about 1/4" of travel left. I could pull the pedal back to where it is supposed to be but it would just fall back down to the floor. I was able to very slowly and carefully park the truck using park and the parking brake. With the engine still running and the vehicle in park, I depressed what was left of the brake pedal and held it to the floor and heard a moaning noise coming from the area near the master brake cylinder and could feel the brake pedal shuddering under my foot. I feel unsafe driving this vehicle and I was giving no warning of the brake failure. I am having the vehicle towed to sewell buick gmc in dallas and will update when they find cause. I will also be calling gm customer support as I feel this is a huge safety hazard.
When going under 15mph brake pedal becomes hard and doesn't work. Vehicle has 50k miles. Brake booster declared bad by mechanic. This issue almost casued accident.
Truck looses braking ability at low speeds such as traffic or parking lots.
Issue when braking that causes the brake pedal to lose power and causes the driver to depress the pedal extremely hard to have the brakes engage. The cause appears to be a faulty vacuum pump that requires replacement. This could be potentially a large safety issue if the pump fails and the vehicle is unable to be stopped in time to avoid a possible collision. This issue has occurred both while in traffic on a city street and while attempting to park the vehicle.
The vacuum pump controlling the brakes has failed. When the brake is pressed in stop/go traffic, it will first stop the vehicle, but if the brake is released then pressed again, the brakes will not work and the vehicle continues to roll forward. A mechanical/electrical noise can be heard before this occurs. This is more noticeable on wet roads or roads with a steep decline.
At low speeds (parking speed, school pickup lines, creeping traffic speed) the brake pedal will lose all boost pressure. The brake pedal becomes extremely stiff and ineffective. This situation occurred on a few occasions and caused great alarm with myself and my wife. Great potential exists for an accident involving machinery, animals or human beings. The vehicle was taken promptly to the local gmc dealership for service with a copy of gm service bulletinno.: pit5361b. The dealer kept the vehicle for several days to perform an existing safety recall for steering anomalies (recall # 18289) as well as diagnose and repair the brake boost issue. Service bulletin pit5361b was followed and the vacuum pump assembly was replaced to resolve the brake boost issue. This repair occurred at 40728 miles - just beyond warranty coverage terms. Total cost of repair $686.56. The brake boost issue has not reoccurred to date since the repair. This vehicle is not abused or involved in any rigorous activity. It is a general use vehicle and is used primarily for family errands and road trips.
When brakes are applied the pedal is hard and vehicle does not stop. It seems to happen when going slow for example in parking lots etc. I have read other articles where people are experiencing same thing at high and low speeds. It does not happen all the time, but it started 11/2017 and I've experienced this four times now and the wife as well.called gm the other morning was told there was no recall for this issue per gm some vehicles were affected but not mine, explaining what I've found and was told to take the vehicle to dealer for diagnostic.asked if it would have to be the dealer cause they were expensive to do diagnostic. Was told yes and it would have to be out of pocket.
Vehicle is shutting off at any given speed, ie. 35 MPH in town or 70 MPH on a highway with oncoming traffic. When vehicle shuts off, loss of all control of the vehicle takes place. No brakes, no steering, nothing until the vehicle randomly turns back on. This is not a consistent occurrence to know when it is going to happen or be prepared for it to happen. I watched my husband shoot across the road into the other lane and almost put the vehicle over a bank one night when it happened. This has been an issue since january 2018 for us, we have taken it to the dealer where it was purchased multiple times for them to tell us they can't duplicate the issue and nothing is coming up in their system for an error code. It has caused a major inconvenience for my family, as we don't dare put our children in the truck leaving the responsibility solely on one parent to transport the kids to and from daycare. I worry for the safety of my husband on a daily basis.
Tl* the contact owns a 2015 gmc sierra 1500. An independent mechanic called on behalf of the vehicle owner, who is deaf. The contact stated that the brake pedal failed to depress and stop the vehicle properly. The contact diagnosed that the vacuum pump and the brake booster system were malfunctioning. The dealer (gulf coast chevrolet buick gmc, 1901 w. Fm 523, angleton, tx 77515, (800) 593-5226) stated that there were no recalls on the vehicle. The manufacturer was called and the contact was provided a case number. The manufacturer stated that the vehicle had too many miles to be covered by the extended warranty. The failure mileage was 69,000.
Hard brake pedal when attempting to stop, happens on hwy with fast speeds, slow speeds in parking garage and in reverse.
While driving at highway speed, I entered an off ramp to find no power assist to my brakes. The pedal was extremely stiff. I came very close to having a collision with the car in front of me. I contacted my mechanic immediately, he checked it out and it appears the vacuum pump has failed without warning. I have owned this vehicle since new and have had no problems with it until this issue.
Tl* the contact owns a 2015 gmc sierra denali. While driving approximately 70 MPH, the brake pedal was applied, but failed to respond. The contact had to apply pressure to the brake pedal with both feet to stop the vehicle. The dealer (jay buick gmc, 18800 rockside rd, bedford, oh 44146, 440‑232‑5000) ordered the replacement oem part; however, the contact had the brake system vacuum pump installed by an independent mechanic. The manufacturer was notified of the failure. The approximate failure mileage was 82,000.
I was backing up and the brake pedal got hard and would not stop the truck. I tried to go forward and the same thing happen.
Vacuum pump vachose assy brake booster and mastercyclinder failure which cause brake failure while driving. Happened several times until 'service trailer brake' light came on. No brakes, no way to press down pedal. Gmc refuses to assume responsibility for repair. Cost: $1311.16
Tl* the contact owns a 2015 gmc sierra 1500. While operating the vehicle at very low speeds and while pulling into a parking space, the brakes suddenly malfunctioned. The failure caused the brake pedal to extend to the floor and the vehicle would not immediately stop. The contact stated that the failure occurred on six separate occasions. The vehicle was taken to the local dealer (marshall chevrolet, 1601 s. State st, jerseyville, il), but the failure was unable to be duplicated. The manufacturer was not notified of the failure. The VIN was not available. The failure mileage was 2,500.
Having issues with hard brake pedal. It happened a few time when the truck was new but could never duplicate it. Twice it almost caused an accident. I have since found a way to duplicate it. When backing a boat trailer down a ramp every time they become hard, I have to ride the emergency brake, but it only happens when the boat is on the trailer. I have researched this over the years but not till recently have I seen other reports of truck with this issue. I have not contacted the dealer yet but will in the next week or so when I can take off to go. I do not now date of first occurrence but I put a random date in 2015.
Tl* the contact owns a 2015 gmc sierra 1500. The contact stated that the vehicle failed to pass state inspection due to master cylinder, vacuum pump, brake booster, and hose leakage. The dealer was not contacted. The manufacturer was notified of the failures. The vehicle was not repaired. The failure mileage was approximately 33,000.
When brakes are applied the pedal is hard and vehicle does not stop. It seems to happen when going slow for example in parking lots etc. I have read other articles where people are experiencing same thing at high speeds. It does not happen all the time, but it started 7/1/2018 and I've experienced this four times now. Took to dealer this morning they refused to look at articles explaining what I've found.
While in motion the brake pedal goes hard and is difficult to stop. I believe this is the cause of a low speed incident I had earlier this year. The issue occurres mostly at slow speeds in stop and go traffic. If feels like the brake booster fails and the pedal is bottomed out. It happens frequesntly while hauling a trailer in reverse. Very dangerous situation.
Brake failure due to bad vacuum pump
While driving in stop and go traffic speeds there have been a number of occasions that the brake pedal goes hard and the truck will not stop. I have noticed on other forums that this seems to be a common issue.
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
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.
Tl* the contact owns a 2015 gmc sierra 1500. While driving 5 MPH in stop and go traffic, the brake pedal became harder to depress to stop the vehicle. There were no warning indicators illuminated prior to the failure. The vehicle was taken to graff chevrolet buick (495 sanilac rd, sandusky, mi 48471, (810) 648-9850), but no failures were located. It was unknown if the manufacturer was contacted. The failure mileage was 29,000.
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.
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.
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.
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.
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.
VIN decoder
See the problems and recalls for an exact car
Buying a used 2015 GMC Sierra 1500?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history