2015 Toyota Prius service brakes problems
88 owner complaints filed with NHTSA name the service brakes on the 2015 Toyota Prius — 53% of all complaints for this model year.
What owners report
“I am reporting an active, severe safety hazard regarding the braking system on my 2015 Toyota Prius ( Mileage: 79,000). The vehicle has been officially diagnosed by Toyota Culver City with Diagnostic Trouble Code DTC C1391, confirming an internal failure and lack of pressure within the brake…”
filed Sep 17, 2026
“Problem: Brake Actuator is pulsing the Booster Pump to keep running intermittently, 5-10 seconds. Console lights lit up for ABS problem. Does not clear. Toyota Dealership Report: DCT C1391 Abnormal Leak: Monitored TEH Accumulator Pressure and its not holding pressure. Pump keeps running…”
filed Aug 31, 2026
“On XXX, I was driving my 2015 Toyota Prius with my family in the vehicle and approaching stopped traffic on dry pavement. An emergency vehicle was approaching from behind, so I began braking earlier than usual. When I applied the brakes, the vehicle did not stop normally. The front slowed/stopped while the rear of the…”
filed Aug 26, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Service Brakes problems in other Prius years
| Year | Reports | Share |
|---|---|---|
| 2024 Prius | 2 | 8% |
| 2022 Prius | 4 | 17% |
| 2019 Prius | 9 | 30% |
| 2018 Prius | 3 | 8% |
| 2017 Prius | 14 | 15% |
| 2016 Prius | 18 | 12% |
| 2014 Prius | 93 | 45% |
| 2013 Prius | 229 | 56% |
| 2012 Prius | 182 | 43% |
| 2011 Prius | 262 | 51% |
| 2010 Prius | 593 | 21% |
| 2009 Prius | 63 | 13% |
Other reported problem areas on the 2015 Toyota Prius
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.