2018 GMC Terrain service brakes, hydraulic problems
13 owner complaints filed with NHTSA name the service brakes, hydraulic on the 2018 GMC Terrain — 6% of all complaints for this model year.
What owners report
“The contact owns a 2018 GMC Terrain. The contact stated that while driving 20 MPH, the brake pedal was firm and the "Service Brake Assist" message was displayed on the instrument panel. The contact used excessive force to depress the brake pedal while stopping the vehicle. The vehicle was driven to…”
filed Sep 14, 2026
“The contact owns a 2018 GMC Terrain. The contact stated that while her son was driving 45 MPH, the brake pedal was firm while depressed. There was no warning light illuminated. Due to the failure, excessive force was needed on the brake pedal to stop the vehicle. The contact was able to drive the…”
filed Aug 21, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- Rear brake caliper pistons may have an insufficient coating causing gas pockets to form…Campaign 18V576000 · Aug 30, 2018
Service Brakes, Hydraulic problems in other Terrain years
| Year | Reports | Share |
|---|---|---|
| 2024 Terrain | 1 | 2% |
| 2020 Terrain | 7 | 4% |
| 2019 Terrain | 7 | 4% |
| 2015 Terrain | 1 | 0% |
| 2011 Terrain | 2 | 1% |
Other reported problem areas on the 2018 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.