On multiple occasions specifically while traveling at low speed rate such as slow moving traffic or pulling in or backing out of parking space. The brakes become hard to push and the brakes do not engage. You must push the brakes very hard to stop. We took to the GM service at our dealership and a brake vacuum pump was replaced. The next day we were driving the vehicle and the brakes failed to stop. Thankfully we were in a parking lot and were able to stop against bumper stop. We called the GM service dealership and they arranged for a tow. This is extremely dangerous situation.

- Edmonton, KY, USA

At slower speed, brakes become stiff and was unable to stop vehicle. The brakes did not engage all the way to the floor as normal and instead stopped about 1/4 of the way and was solid even when pressing both feet on the brake. Almost rear-ended the vehicle in front of me but since I was at such a slow rate of speed I was able to roll a few feet and the vehicle stopped. I had to turn the vehicle completely off and start it back up and it seemed to work fine but the next time I was in the vehicle at the slow rate of speed, the brakes then again were very hard to press. I do not feel comfortable driving the vehicle until this problem is taken care of. I contacted the local dealer and they told me it would be 5 days until they could get to it - disappointed in that considering the severity of the issue.

- Lake Park, GA, USA

The contact owns a 2015 GMC Yukon. While driving at low speeds, the brakes failed to engage. The brake pedal became extremely stiff and the emergency brake had to be applied to stop the vehicle. The dealer was not contacted. The manufacturer was notified and referred the contact to NHTSA. The vehicle was not diagnosed or repaired. The failure mileage was 47,200.

- Mcdounough, GA, USA

When driving in stop and go traffic or city driving the brake pedal will become hard to push and little to no braking power. Brakes are fine at high way speeds.

- Lockeford, CA, USA

Driving at a low speed through a drive through and my brakes failed when I tried to stop before pulling out onto a cross street. Pedal locked, and vehicle continued to roll. After stepping on the brakes a few times they engaged again. Same problem happened again when I was leaving a parking lot, only this time the brakes would not engage after several attempts. I coasted into a potted decorative tree that stopped me, shifted into neutral and back into drive and they began working again. No warning signals appeared on dash, and brakes and brake fluid have been checked and all are satisfactory.

- Midland, TX, USA

The passenger tail light is working intermittently. The dealer said that the only fix is to buy a new brake light unit @ $650. After searching on line, other options are to send brake light unit off for repair, or purchase after market brake light unit. As many people that are having this same issue, it sure seems like GMC would correct this faulty brake light.

- Austin, TX, USA

Brake pedal suddenly got rock hard when I was trying to slow down, our truck just kept going forward, I was helpless in that situation and really thought that accident is unavoidable because I was getting closer and closer to another vehicle, after pressing brake pedal many more times I was able to stop our Yukon literally one inch from a car in front of

- Raleigh, NC, USA

I was told my a collegue that my drivers side brake light was out. I took it into the local mechanic and it was not out. A few months go by and I am told again, that my drivers side tail light is out. I take it to a different shop and it is working correctly. The very next day a truck tells me at a stop light that I have no brake lights. I was pulled over by a police officer for not having properly working break lights. He let's me go with a friendly notice, but as soon as I started my vehicle to drive away he immediately pulls me back over to tell me that he was mistaken that only my driers side brake light was out. This has happened intermittently over the last three to four months.

- Yukon, OK, USA

I was driving and with warning SUV started accelerating and I brakes wood not work I was not able to stop intill I press hard on the pedal

- San Jose, CA, USA

Driver side brake led lighting is working intermittently. Had it replaced under warranty. Passenger side brake led lighting now working intermittently, new issue. Have not had replaced yet due to outrageous cost($700) for fixture replacement. Only 40,000 miles on vehicle obviously reflects a serious safety issue to financially strapped consumers.

- Folsom, CA, USA

Rear left and right brake lights stopped working with no warning while at a stop light in the city. Apparently several GMC Yukon 2015 owners are having the same problem and it's an electrical defect with the taillights it's not the bulbs.

- Glendale, AZ, USA

The passenger side brake light on my 2015 GMC Yukon no longer works. The cost to replace it is over $500. After doing some research on led lights I believe the brake light is faulty or cheaply made and that it should last a lot longer than 3 years and 66,000 miles.

- Stevens, PA, USA

Both brake lights failed within weeks of each other - around 60K miles. Faulty led circuit boards. Light assemblies are not repairable by dealership. New assembly over $500 each. GM takes no responsibility in resolving the issue. Unacceptable! no more gms for my family!.. and that includes Chevy.

- Clinton Township, MI, USA

The contact owns a 2015 GMC Yukon. While driving approximately 5 mph, the brake pedal stiffened and the vehicle did not stop when the pedal was depressed. There were no warning indicators illuminated. The contact used the emergency brake to stop the vehicle. The vehicle was taken to keyes woodland hills Buick GMC (6133 topanga canyon blvd, woodland hills, ca 91367) where it was diagnosed that the vacuum pump failed and damaged the entire braking system. The technician replaced the vacuum pump and the entire braking system. The manufacturer was made aware of the failure and stated that there was no recall. The failure mileage was 40,500.

- Simi Valley, CA, USA

The contact owns a 2015 GMC Yukon. While at a drive thru with the brake pedal depressed to the floorboard, the brakes failed. The contact had to apply excessive force in order for the vehicle to stop. There were no warning indicators illuminated. The vehicle was taken to starling Chevrolet Buick GMC (1001 E irlo bronson memorial hwy, St cloud, fl 34769, phone: (407) 892-5144), but the cause of the failure could not be determined. The vehicle was not repaired. The manufacturer was notified and stated that the failure had to be duplicated. The approximate failure mileage was 42,000. The VIN was not available.

- Orlando, FL, USA

Had 30,000 miles and my steering colum was making popping noise. The dealership tried to just repair the bearings but it only worked for 2 weeks. They had to replace the whole steering colum. Brakes are squeaking for no reason had les schwann check them and still can't figure it out. My A/C now quit working. Struts in hatch also had to be replaced and passenger window molding is coming off.

- Arlington, WA, USA

The contact owns a 2015 GMC Yukon. While driving various speeds, the brake pedal was applied and the vehicle failed to stop. The brake pedal had to be pumped several times to stop the vehicle. The vehicle was taken to the dealer were it was diagnosed that the brake booster needed to be adjusted. The vehicle was repaired, but the failure recurred. The vehicle was taken back to the dealer where the brake failure was duplicated and diagnosed that the brake boosters needed to be replaced. The manufacturer was notified of the failure. The failure mileage was 35,000.

- Franklin, TN, USA

Earlier this year I purchased a 2015 GMC Yukon denali. After driving it a short amount of time I realized the brake pedal is located significantly higher than the gas pedal. I've come to realize that the ~4inch gap is causing a severe safety hazard, especially in emergency braking situations. My foot, along with others in the post linked below, often gets caught in the large gap between the gas and the brake, especially when moving quickly. There have been many instances to date where the sole of my shoes has gotten stuck under the brake pedal, preventing me from stopping in time. I've narrowly avoided at least 5 accidents, because of this. Fearing that it is a matter of time before it results in a collision I reached out to GMC to see if there was a fix. They responded and said that the pedals are working as designed and said there was nothing that can be done. I'm very disappointed in their response, especially considering the clear safety hazard it creates. It is a large car, requiring more braking distance than most. Any impedance to the process should be taken seriously especially if it is a manufacturer design flaw such as this. Similar complaints have been voiced in this online consumer thread. One of many that I found reiterating the problem. www.tahoeyukonforum.com/threads/gas-brake-pedal-distance.67500/

- Los Angeles, CA, USA

I have a brand new 2015 Yukon denali (short wheel base) with less than a thousand miles and a "service 4WD" message that has appeared twice rendering the car extremely unsafe and un-drivable for a long distance and having to have it towed to the dealer twice. A software update was done on the car the first time, only resolved the issue for a few weeks, the issue re-occurred after 3 weeks. When turning the vehicle on the dash gives the message "service 4WD". the car has a transmission button to change from 2wd, auto, 4 high and 4 low. I do not touch this button, I just leave the car in auto and drive. I do not tow anything, this is just a family car used for commuting. When the "service 4WD' message appears, the car is barely drivable. When it is put in reverse, the car just brakes after a few feet, as if the parking brake were on, but it obvious is not engaged. When turning left or right, the car brakes mid-turn and will only complete the turn if 3/4 to full accelerator is applied to continue through the turn. The car slightly bucks through the turn and the engine sounds different and has little power going around corners and going up hills. The car cannot safely be driven in a straight line faster than 40-50 mph. I telephoned onstar and diagnostics were run during both occurrences with the same error message from onstar diagnostics: "the braking system has an issue- transfer case module not working as expected". when will GM issue a recall on this safety issue, I do not feel safe letting my wife and child in the car if it brakes by itself, loses power and cannot complete turns. I purchased this car to have a safe/large vehicle for my family: Service 4WD appears on screen it renders the car un-drivable and the transmission button becomes inoperable and selecting other transmission modes becomes not possible.

- Cliffside Park, NJ, USA

I just completed a claim for my 2015 Yukon denali, NHTSA id #: 10643049 and read that almost the same exact issues are going on with the 2015 Chevy Tahoe models, see: NHTSA id number: 10638437, 10633519 and 10631583. When will GM see there is a pattern and issue a recall for this transmission issue? in all cases these render the calls un-drivable and having to have them towed.

- Cliffside Park, NJ, USA