2021 Toyota Sienna service brakes problems
80 owner complaints filed with NHTSA name the service brakes on the 2021 Toyota Sienna — 48% of all complaints for this model year.
What owners report
“When braking to a stop at low speed (stopping at stop sign or at light), then car accelerates forward even though my foot is on the brake attempting to slow the car down. This unintended acceleration is dangerous and can cause an accident.”
filed Sep 27, 2025
“Brake Transition Issues: I have noted frequent jolts of power when braking, which creates at least the sensation of, if not actual acceleration while breaking. Web research suggests this may be linked to the vehicle switching between regenerative and mechanical braking systems, and that the problem…”
filed Jul 17, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Service Brakes problems in other Sienna years
| Year | Reports | Share |
|---|---|---|
| 2022 Sienna | 62 | 52% |
| 2020 Sienna | 2 | 6% |
| 2019 Sienna | 1 | 2% |
| 2018 Sienna | 2 | 3% |
| 2017 Sienna | 11 | 7% |
| 2016 Sienna | 1 | 1% |
| 2015 Sienna | 16 | 7% |
| 2014 Sienna | 10 | 6% |
| 2013 Sienna | 12 | 7% |
| 2012 Sienna | 11 | 4% |
| 2011 Sienna | 18 | 3% |
| 2010 Sienna | 6 | 3% |
Other reported problem areas on the 2021 Toyota Sienna
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.