Power Assist Brake Vacuum Problems of GMC Sierra

The contact owns a 2015 GMC Sierra denali. While driving approximately 70 mph, the brake pedal was applied, but failed to respond. The contact had to apply pressure to the brake pedal with both feet to stop the vehicle. The dealer (jay Buick GMC, 18800 rockside rd, bedford, OH 44146, 440-232-5000) ordered the replacement oem part; however, the contact had the brake system vacuum pump installed by an independent mechanic. The manufacturer was notified of the failure. The approximate failure mileage was 82,000.

See all problems of the 2015 GMC Sierra 🔎.

Steering wheel jerks in hand when depressing brakes while making a right hand turn. This can be duplicated with the vehicle idling in neutral or park. Dealership attempted to fix problem on 01/25/02 by replacing the power steering pump and brake booster. When I attempted to pick up my truck on the 25th, I was notified by marcus that they had not found the problem and that they considered the problem a safety issue, I wasn't allowed to have the vehicle but was given a loaner to drive. My vehicle was returned on the 29th and I was told that since the dealership could duplicate the "problem" on another new vehicle on the lot, gm had determined it was not a problem but a "characteristic" of this vehicle with the power assist. I contact gm customer assistance to make them aware of my concern with the safety of this vehicle but to no avail. I asked them to document my concerns. It is apparent that the dealership was initially concerned that there was a safety issue with this vehicle or they would have returned it on the 25th. I am concerned with gm's response that this is a "characteristic" of the vehicle just because some others exhibit the same problem. I was just recently made aware of your website and would greatly appreciate your assistance with this matter. Thank you! scott.

See all problems of the 2001 GMC Sierra 🔎.

Consumer was traveling 60 mph on highway and applied brakes, and there were no brakes. He was able to pull over to shoulder, and vehicle had to be towed. Dealership was aware of problem. The brake booster was replaced and failed again.

See all problems of the 1998 GMC Sierra 🔎.

Slowing to stop, brake pedal wouldn't depress to stop truck, brake booster replaced 1st time, still in shop this time, struck curb to stop.

See all problems of the 2000 GMC Sierra 🔎.

On-going / intermittent problem with brake system; brake pedal would be hard to press, causing extended stoping distance. Vehicle been in / out of dealer shop on three occasions and nothing could be found. Can NHTSA help in this matter. Also replaced master cylinder and brake booster.

See all problems of the 1997 GMC Sierra 🔎.