2017 Yukon Denali Brakes Apply Themselves While Driving

[Cavansmith]

I had a single experience where the brakes on my 2017 Yukon Denali applied by themselves while driving. I was driving downhill through a subdivision at approximately 10-15 MPH with my foot lightly on the brakes preparing for a turn into a driveway. The brakes began to lock up on their own while turning. The condition continued until I turned the vehicle off. It sounded as if the brakes in the rear were locking up so I believe the parking brake was the culprit. I briefly saw the "Hill Assist" message on the DIC.
GM sent a tow truck and took it to my local dealership. The service department worked diligently for over a week to replicate the problem and could not. GM could not find any other instances where this situation has been reported. I have driven the car for the past couple days with no problems, but am concerned about it happening again at higher speeds. I am looking for anyone else who may have had or heard of this issue.

 

[Doubeleive]

so your saying the rear wheels were locked up and the front wheels were pulling you forward making the rear wheels make a rubber squeal on blacktop?
if not then you may have simply felt the "hill assist" feature of the transmission kick in, which is a feature to help slow you down when going downhill

 

[Miami-Dade]

Mine does it all the time [2016 Tahoe] going down the steep hills in the Blue Ridge Mountains. Hill assist message comes on for a few seconds. I never felt the rear brakes locking up. At least I did not notice it.

 

[Illnasty]

Mine does it all the time [2016 Tahoe] going down the steep hills in the Blue Ridge Mountains. Hill assist message comes on for a few seconds. I never felt the rear brakes locking up. At least I did not notice it.

My Denali does the same but I can never duplicate it

 

[dbbd1]

Which makes sense if it felt the parking brake was on, it being that the transmission was doing the slowing down. I can feel mine kick in but, yes, hard to duplicate (just like the hill start assist).

 

[Alexquade]

I had my “grade assist” kick on before in my 15 Silverado when I was trying to slow down fast fast on an exit ramp. Had it do it before in tow mode also.