2021 GMC Acadia service brakes problems
17 owner complaints filed with NHTSA name the service brakes on the 2021 GMC Acadia — 12% of all complaints for this model year.
What owners report
“My brake pedal got stiff when I was driving. I had zero control of my brakes. I was informed by a GMC dealership that my BRAKE BOOSTER blew up causing my brakes to stop working and metal shrapnel to be sent into my engine. My 2021 vehicle is a complete loss. GMC has done NOTHING to help me.”
filed Jun 26, 2026
“I was driving and all of a sudden my break pedal was inoperable. It was stiff and unable to be used. Luckily I was only going 40 MPH. I pulled into a parking lot and my car started shaking and apparently the metal parts from the vacuum pump blew into my engine, which completely wrecked my engine. I…”
filed Jun 10, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Service Brakes problems in other Acadia years
| Year | Reports | Share |
|---|---|---|
| 2025 Acadia | 36 | 60% |
| 2024 Acadia | 21 | 38% |
| 2023 Acadia | 1 | 3% |
| 2022 Acadia | 2 | 4% |
| 2020 Acadia | 7 | 7% |
| 2019 Acadia | 16 | 4% |
| 2018 Acadia | 21 | 5% |
| 2017 Acadia | 33 | 5% |
| 2016 Acadia | 4 | 2% |
| 2015 Acadia | 5 | 2% |
| 2014 Acadia | 9 | 2% |
| 2013 Acadia | 3 | 2% |
Other reported problem areas on the 2021 GMC Acadia
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.