2021 GMC Sierra 1500 service brakes problems
22 owner complaints filed with NHTSA name the service brakes on the 2021 GMC Sierra 1500 — 4% of all complaints for this model year.
What owners report
“Vehicle: 2021 GMC Sierra SLT | VIN: [XXX] Dealership: Carl Black GMC Roswell, GA (11225 Alpharetta Hwy, 30076) | Invoice #[XXX] | Service Date: [XXX] Paragraph 1 – Suspension Hazard: Dealership diagnosed a worn left upper ball joint (popping sound on left turns) and installed Rough Country…”
filed Jul 24, 2026
“Left rear parking brake actuator malfunction. The truck would brake unexpectedly. The brake would not completely release at times. Took it to the dealer on June 6, 2024 and they replaced the rear rotors and pads. I asked them if the parking brake actuator was faulty and may have caused the…”
filed Jan 10, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Service Brakes problems in other Sierra 1500 years
| Year | Reports | Share |
|---|---|---|
| 2026 Sierra 1500 | 2 | 3% |
| 2025 Sierra 1500 | 3 | 3% |
| 2024 Sierra 1500 | 10 | 3% |
| 2023 Sierra 1500 | 12 | 3% |
| 2022 Sierra 1500 | 27 | 5% |
| 2020 Sierra 1500 | 48 | 11% |
| 2019 Sierra 1500 | 107 | 17% |
| 2018 Sierra 1500 | 39 | 13% |
| 2017 Sierra 1500 | 100 | 28% |
| 2016 Sierra 1500 | 100 | 30% |
| 2015 Sierra 1500 | 219 | 31% |
| 2014 Sierra 1500 | 139 | 19% |
Other reported problem areas on the 2021 GMC Sierra 1500
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.