October 2019 went to the dealership to have breaks worked on given recent recall about the mechanical vacuum pump output may decrease over time, decreasing the amount of vacuum/power brake assist. However, shortly after getting the recall done on my truck (1 week later) I was in the parking lot backing up out of my parking spot and the break pedal became really stiff and I couldn't push hard enough to stop the vehicle from moving. I just kept rolling until I hit the curb. So far this has happened a dozen times and all when I was moving about 5 miles an hour the exact same way, pedal becomes stiff and I couldn't stop the truck from moving. I feel like things are worse now after getting the recall done. This was never an issue before and as I look at the recall notice, it state incomplete, telling me possibly the manufacture knows there's still an issue but no fix has been done yet, even after 4 months.
2017 GMC Sierra brakes complaints
Page 2 of 2: complaints 11 to 20 of 20, newest first, as owners wrote them.
Vehicle frequently exhibits loss of braking power. When this occurs, something sounding like the ABS systems is sometimes engaged by the vehicle and other times not. While gm claims braking performance meets federal standards, the braking power is greatly reduced when the hydraulic system is engaged and almost non-existent when neither vacuum pump nor the hydraulic system functions. Even if the braking performance meets federal standards, it creates a dangerous situation when the driver is not expecting a failure. A gmc dealership has admitted there is an issue and recommends replacing the vacuum pump but has been unable to source the parts in over two weeks and has no eta for when the part will be available. Meanwhile the braking power loss condition occurs every time the vehicle is driven. During the first instance, I was towing a travel trailer in stop and go traffic down a 7% grade. Had it not been for the trailer brakes, this could have been catastrophic. The second occurrence involved backing into my driveway and nearly causing a collision because of poor braking performance. Now that I fully aware of the issue, the vehicle is driven sparingly (only when absolutely needed) and with great care. The characterization of this issue by gm as not being a grave safety concern is inaccurate. Their inability to source parts in a timely manner is inexcusable.
First and most importantly my brakes are my main issue and safety problem. I nearly ran into the car in front of me at a busy intersection. My trucks brakes lose pressure after the first initial stop coming to any traffic lights, stop sign, slow traffic, parking lots etc... No matter how slow or fast the trucks movement is. First break attempt is ok but 2nd starts losing pressure and 3rd attempt is complete lost of pressure anf and the truck just rolls until it slowly comes to a stop. I worry about the safety of myself and others motorist regarding this issue. My second complaint is my driver side mirror. Every time I get into my truck and start it. My driver side mirror moves out of its setting and I constantly have to fix it.
The past month as I push on the brakes driving on the road my steering wheel starts to shake as the brakes are being applied. Does not happen all the time has actually only happened 3 times in a month.
While braking pedal feels like gurgling and at times complete loss of power assist making pedal very hard to depress all were in motion and intermittent making dealer diagnosis difficult and not yet able to replicate so dealer refuses to do work
For the federal safety agency recall 19v645, why did the federal safety agency accept a 'reprogramming' of the functionality to 'band aid' the issue rather than requiring replacement of the vacuum pump, which is the identified defective item?
As I was backing up I applied my brakes and for some reason nothing happened which resulted in my hitting my wife's car and damaging her drivers side quarter panel. When I asked gmc about the issue they said it was just an error on my part. Now I find out that there is a recall on the braking system that the pressure to the brakes may be affected. Who is responsible for the damage to her car?
Was driving my 2017 gmc sierra with my wife and young son. I went to stop at a red light and had no brakes. The brake was very hard to push and made a funny clicking noise when I shoved it to the floor. I was barely able to avoid a collision and pull into a parking lot. I noticed then, that the service brake assist light was on. The truck gave no prior warning that anything was wrong. This was a very scary situation that could have resulted in a terrible accident.
While driving on the highway at 70mph, a service brake assistant warning came on. The brakes at that point were extremely difficult to use and there was no way for a quick stop. Was able to get to a dealership where they had to replace the master cylinder, the booster pump, vacuum pump and tubing. Cost for the repair was over $1,200.
I almost killed a kid today parking for a baseball game. I was traveling slowly and parking when my brakes became hard to push and failed. Truck went over curb and toward kid putting on his cleats and not facing me. I was able to push as hard as I could and it stopped. I backed up and brakes worked again. I have 46,000 miles on the truck. I am now afraid to drive it, but it seems they are working again. If this is common, gmc needs to take care of this. Someone will soon be hurt seriously!
VIN decoder
See the problems and recalls for an exact car
Buying a used 2017 GMC Sierra?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history