09gmcwt

All, I took my truck in today to the GMC service, and they do have a TSB out regarding this front end "shake" it indeed does have to do with replacing the brake pedal assembly. I have an appointment on Wednesday to have mine replaced. Also, the TSB did not mention that this was specific to the HD line, it just said 2011 sierra and chevy truck models, so this could also be an issue for the 1/2 ton crowd as well. By the way, the service bulletin was dated OCT 1st 2010, and I took my truck in on OCT. 21st, lol so go figure they did not even know about it till I went in today and asked. O well, I just hope this fixes the issue. Hope this helps others out there with the same thing. Mike.

I HAVE THE SOLUTION!!! I have a 2011 GMC Sierra 2500HD crew cab long bed. This same exact thing happened to me within the first 200 miles of driving the truck after I bought it. I took it to the dealership, they drove it and had the same thing happen to them. They checked the brakes, tires, suspension and couldn't find anything wrong with it. They called GM tech support that said they would do some research on it. They got back to the shop foreman and told him that he needed to install a new designed brake pedal along with a retainer clip. The way the shop foreman explained it to me was that the actual brake pedal is to long, and causes the brake master cylinder to still be engaged without your foot on the brake, which sends a signal to the computer and tells the ABS to kick in. The dealership replaced the pedal and the retainer clip, and the problem has never returned. I currently have 4,300 miles on the truck. If anyone wants, they can pm me and I will give you the information from my dealership that did the repair on my truck. Hope this information helps. Nick can you send me h info please thanks mike

I have just under 3000 on mine and still going strong, lol Mike

I also had this within the first 1000 miles, same truck 2500 HD 2011, gas auto. Another member had it as well, and when he took it to the dealer they kept it for a while and said it was a defective brake pedal assembly. that the electronics were causing the anti lock brake mechanism to engage on its own and not completely de activate. This is exactly what my truck felt like, only the front passenger side was grabbing. But mine went away and has not returned, so I am not planning on taking mine in unless it comes back. I am waiting to see if GM issues a recall or something as it seems like this is becoming a larger issues, I have seen at least 5-6 people post with similar problems. Mike