2020 GMC Terrain service brakes problems
63 owner complaints filed with NHTSA name the service brakes on the 2020 GMC Terrain — 32% of all complaints for this model year.
What owners report
“The brake suddenly became impossible to depress more than 3/4 of an inch. Almost unable to stop nearly hitting another vehicle. The dashboard then lit up with a "service brake system" warning. Luckily was only a few minutes from home brought it home and began the search for the issue. The brake…”
filed Aug 23, 2026
“While driving, I suddenly smelled something burning. Immediately after, a warning popped up stating 'Engine power is reducing,' the check engine light came on, and I experienced a sudden, near-total loss of power braking assist, making the brake pedal extremely hard to press. I had to use intense…”
filed Aug 19, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Service Brakes problems in other Terrain years
| Year | Reports | Share |
|---|---|---|
| 2026 Terrain | 3 | 10% |
| 2024 Terrain | 2 | 4% |
| 2022 Terrain | 1 | 2% |
| 2021 Terrain | 8 | 23% |
| 2019 Terrain | 63 | 34% |
| 2018 Terrain | 68 | 31% |
| 2017 Terrain | 2 | 2% |
| 2016 Terrain | 5 | 3% |
| 2015 Terrain | 8 | 3% |
| 2014 Terrain | 9 | 3% |
| 2013 Terrain | 7 | 2% |
| 2012 Terrain | 5 | 1% |
Other reported problem areas on the 2020 GMC Terrain
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.