When braking, the service trailer brake system message and service stabilitrac message appear on the dash and brake pedal gets soft to hard repeatedly and truck pulls from side to side violently as if one side of the trucks brakes are working and the other side is not.

- Kent, WA, USA

Brake pedal has to be pushed almost all the way to the floor to stop, this recently changed from barely having to apply any pressure to the pedal. Took it to Quebadeaux gmc on 11-10-2021 and they inspected the brakes, said everything was good and that-??s normal for the brakes to be that soft. That-??s not normal or it would-??ve always been like that.

- Sahuarita , AZ, USA

The brake booster cilynder have a bad leaking it was parked when I saw this happen

- Knoxville, TN, USA

The contact owns a 2016 GMC Sierra 3500. While passing a boat ramp hauling a boat trailer, the brakes and steering failed to function. The contact was able to maneuver the vehicle and noticed that the serpentine belt became detached. The contact was able to reconnect the serpentine belt. The vehicle was taken to legacy Buick GMC (293 E howze beach rd, slidell, la 70461, (985) 231-5256) where it was awaiting diagnostic testing. The manufacturer was notified. The failure mileage and VIN were not available.

- Slidell, LA, USA

-all started with loud pop, metal failure sound. -at a stop, with brakes applied, the power steering turns the wheel to the right. I have to pull to the left to keep the wheel centered. (not moving) this pressure issue will finally stop and the wheel will center on it's own. -steering has slop, feels loose, dead center -while at speed applying the brakes the steering wheel was torn from my hand 3 times. The power steering causes truck to change directions when braking. 99% of the time the truck turns right. The hyroboost system is turning the steering system to the right which changes the direction of the truck. -while driving the power steering assist appears to turn off and on. As if there is a power loss or too much power was applied than it returned to normal. The truck has been at the dealer 3 different times. First dealer visit the tech deemed the truck unsafe to drive. This was determined by just driving the truck from the service lane to the garage. Tech identified a GM tsb (pit5501D) to investigate the issue and contact GM. GM outlined a repair however the repairs did not resolve the issue. I was told by the dealer to take it to another dealer for a second opinion. This was after returning to the dealer for the second time and stating the steering system is now leaking and the issue still remains with some improvement. 3rd visit at the 2nd dealer: Second dealer drove the truck with me and it was difficult to control. The dealer tech was driving and I was sitting in the passenger seat. They deemed it unsafe to drive and put me in a loaner. 2nd dealer identified metal in the steering fluid and parts that contain fluid must be replace. Personal thoughts are the steering boxes are factory defective and causing them to fail over time. This then introduces metal into the hydroboost system which results in brake and steering failure.

- Manassas, VA, USA