Faulty brake vacuum pump leading to reduced braking force under repeated use or in a pannic situation leading to a collision. I hit a deer because I was unable stop or sufficiently slow down to avoid hitting it. I noticed reduced braking force and a hard brake pedal. I have read of several reports on the internet involving this issue
2017 GMC Sierra 1500 brakes complaints
Page 5 of 5: complaints 101 to 108 of 108, newest first, as owners wrote them.
Breaks have out at 36.5k miles. Vacuum to break line messed up. Was in busy traffic going 50-60mph. Traffic slowed down but truck would not break. Very very scary situation. Gmc dealership knew exactly what the issue was over the phone. Took it to them and car was out of warranty by 500 miles. 800$ out of pocket and took them 10 seconds to identify once the vehicle was at the dealership. Seems like they know the issue very well
I had the rotors replaced on my new truck at 6000 miles and paid for repairs out of pocket. I continued to hear brake noise. On my way to the dealership on the weekend I was scheduled to have the brake noise investigated and to have an oil change done, I had catastrophic brake failure. A vehicle in front of me made a lane change into my lane and then slammed on the brakes in front of my vehicle at a green light coming to a complete stop from 40 MPH to 0 in the middle of the intersection. A car had pulled out in front of him changing lanes from the left lane to right. I mashed the brake pedal to stop immediately and my brakes went soft and to the floor on the second push. When I wasn't stopping. I slammed my emergency brake with my left foot and injured a few toes on my left foot trying to stop before my vehicle. My vehicle did not come to a complete stop. Instead, my vehicle skidded and lightly tapped the vehicle in front of me doing minor bumper damage to both of our vehicles. However there was a toyota truck behind me, and struck my vehicle directly while I was at a stand still, while the driver was doing over 70 MPH when he collided with my sierra. My sierra has the pin or part of the caliper that moves the brake pads, completely pushed the piston into the rotor. The vehicle has had brake issues since I paid to have the brakes and rotors replaced at 6000 miles. I have records of the incident and the brake failure from a mechanic and auto body shop documenting the complete failure of the brakes. Directly after the brakes were replaced within another 8000 miles the brake booster on the vehicle went bad and was replaced as well.
'takata recall' driving the truck to the store, when I was parking the brake pedal got extremely hard, lost all brake functions. Immediately took the truck (2017 gmc sierra 1500) to the dealership they told me it was the vacuum pump and belt. Had it replaced under the warranty on no additional cost.
After exiting i285 north of atlanta onto the ashford dunwoody exit, my breaks stopped working and the pedal would not press down. I was in motion at the time and happened to be moving up an incline. I had to down shift from drive into a lower gear and use the emergency break to avoid a collision with the car in front of me.
Vacuum pump issue with gmc sierra - I noticed a problem braking my pickup, spongy brakes, hard stopping. I took it to my local chevy dealer (portsmouth chevrolet, portsmouth, nh). They diagnosed it as a problem with the vacuum pump and replaced the pump under warranty. I wanted to alert you because I saw a notice on fox news this evening about your investigation of the problem with earlier models and wanted to alert you that mine is a 2017. You may want to expand the investigation to include later model trucks and suvs. Luckily I caught it in time, no accidents, no injuries.
Vehicle has hard shift at 5-6 MPH. Dealer stated could not find issue, and reflashed TCM.approx month later, at 10k miles, truck hard shifted from red light on highway, once up to 45 MPH, shutdown. Steering wheel locked up, no brakes, no control of vehicle at 45-50 MPH.dealer kept for one week, stated loose cable on starter from battery. Exactly 1k miles later (5 weeks), now at 11k miles, truck hard shifted at 5-6mph, and at 45-50 MPH truck tried to shift in 4wd. All lights on dash came on as a result. Dealer has currently had the truck for two weeks and can not find issue. They supposedly consulted gm, and instead of sending an expert tech to help dealer find issue, advised dealer to replace ECM. Replacing ECM is the general answer to not sure what is wrong. This truck is a safety issue, as when it shuts off going 45-50 MPH there is no control or brakes operational on the vehicle. Gm will replace the ECM, and just like right now, will not be able to replicate the problem, and expect me as the consumer to take delivery back of the vehicle. Currently all of my documentation is in the dash of this truck, at the dealership. Trying to determine how myself as the consumer can help ensure this safety issue is corrected, and not passed on.
Was stopped at stop light,with foot on the brake. Started rolling forward and had to press harder on the brake. When holding foot on brake pedal and in gear pedal slowly moves down to the floor. Took vehicle to dealer who was luckily close by. They tested truck brake's and found the same thing. They kept truck, and repaired the next day. Master cylinder was bad. They believe that a seal may have a crack,or a nick in it, allowing pressure to release. The dealer said more than likely gm will ask for part to examine it, so they can't take it apart. Truck had 3173 mile's on it.
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