I own a 2012 Toyota Prius with approximately 132,000 miles. I first experienced problems with the braking system approximately one year ago, in 2025. The ABS, brake, and other warning lights began illuminating intermittently, and I experienced occasional hesitation in braking response. I was concerned enough about the vehicle's safety that I stopped driving it for an extended period. After recently returning the vehicle to service, the warning lights continued to appear intermittently, even when the brakes seemed to function normally. An independent mechanic inspected the vehicle but could not retrieve a diagnostic code at that time. On November 1, 2026, an ABS diagnostic scan at O'Reilly Auto Parts confirmed trouble code C1391, "Abnormal Leak of Accumulator Pressure." The diagnostic report recommended replacement of the brake booster and master cylinder. Toyota previously acknowledged this brake booster problem through Customer Support Program ZJB, which covered certain 2010–2015 Prius vehicles with this defect. Despite my vehicle having fewer than 150,000 miles, Toyota informed me that the coverage period had expired and that no exceptions would be granted. I am concerned that this known braking system defect can develop in vehicles that remain in service after Toyota's limited coverage expires. The intermittent nature of the malfunction makes it particularly concerning because the brakes may appear normal even when an underlying hydraulic pressure problem exists. I request that the federal safety agency investigate whether this defect warrants a safety recall rather than a time-limited customer support program. My diagnostic report is available, and the vehicle can be made available for inspection upon request.
2012 Toyota Prius brakes problems
201 complaints (47% of all complaints for this car). Typical mileage when it fails: 95,755. 15 crashes reported.
- owner complaints
- 201
- of this car's complaints
- 47%
- typical mileage
- 95,755
- crashes
- 15
- recalls
- 0
Which part fails
- Antilock: ABS warning light3
- Antilock: control unit/module1
- Antilock/traction control/electronic limited slip: ABS warning light1
At what mileage
Complaints by mileage at the time of the problem.
Toyota Prius brakes problems in other years
Specific symptoms reported on the 2012 Toyota Prius brakes
Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.
Related recalls
No recalls on record for this model year.
Related investigations
Brake Actuator Valve Wear
The Office of Defects Investigation (ODI) has received a petition dated September 19, 2023 from the owner of a 2012 Toyota Prius V requesting that ODI reevaluate its decision to deny DP19-004. In the letter, the petitioner reported experiencing an unexpected and complete loss of brake power while driving, accompanied by multiple dashboard warning lights. This petition is based on the petitioner's direct experience and assessment that ODI closed DP19-004 because its prompting petition was withdrawn by that petitioner. ODI will review the work conducted during DP19-004 and a review of any additional related complaints and crashes via a new defect petition The petition and related materials can be reviewed at under the following ODI number:11553736.
DP23005
Brake Actuator Valve Wear
On September 19, 2019, the Office of Defects Investigation (ODI) received a defect petition from Mr. Roger Hogan requesting that the Agency investigate and recall certain Toyota Prius, Prius PHV, Camry Hybrid and Avalon Hybrid vehicles for a brake actuator valve wear condition covered under Toyota Customer Support Programs ZJB and ZKK (subject CSP?s). In support of his request, the petitioner identified 117 the federal safety agency complaints allegedly related to the subject CSP condition, including 60 reporting crashes. On September 30, 2019, ODI opened Defect Petition DP19-004 to evaluate the petitioner?s request for an investigation. In August 2020, the petitioner notified the Agency that he was withdrawing his petition. Because the petitioner has withdrawn the petition, we are denying the petition as moot and no further analysis of this petition is necessary.the federal safety agency is authorized to issue an order requiring notification and remedy of a defect if the Agency?s investigation shows a defect in the design, construction, or performance of a motor vehicle that presents an unreasonable risk to safety. 49 U.S.C. ?? 30102(a)(9), 30118. Because the petitioner has with withdrawn the petition, the petition is denied as moot. This action does not constitute a finding by the federal safety agency that a safety-related defect does not exist. The Agency notes that it is not required to receive a defect petition prior to opening a defect investigation and will take further action if warranted by future circumstances.
DP19004
What 2012 Toyota Prius owners say
Most recent owner complaints, unedited.
When I started my car this morning, the red BRAKE light, ABS warning light and anti-slip light were all illuminated. The car does still stop but the brakes are very spongy and there's a clicking noise under the hood. I only moved the car out of the driveway to allow other cars to leave. The brake fluid is not low. This is the problem listed under Toyota's Customer Support Program Notice ZJB but it is past the coverage expiration date. There should not be an expiration date on a known manufacturer issue. If this had happened while I was on the highway driving to work, I could have had a serious accident.
1. My Brake booster failed/malfunctioned. I had to get it repaired/replaced by Toyota so it might be with the dealership or thrown out by now. 2. I had to take it in because I had an incident where I was unable to apply the break on the car. I was lucky enough to be in a not busy street and was able to pull over safely. 3. Toyota diagnosed the issue and proceeded with the repair. They even have an extended warrantee but due to covid I was unable to get the repair in time for it to be covered by one year and had to pay. 4.Toyota did inspect and diagnose the problem. I have already paid for the repair with the dealership. 5.I had some breaking issues but I had brought it to an independent mechanic and they said it was my rotators since they needed to be replaced soon. I replaced them but then still had the issue and that's when my breaks stopped working for a brief time and I took it into Toyota to get it fixed. It been a while at this point but I do remember there being warning lights that turned on because of this issue as well.
Brake lights icons stay on mechanic at Toyota dealership state need new brak master cylinder and booster
Brake warning lights on, buzzing sound every 10 seconds. Likely a known actuator and master cylinder issue
My 2012 Toyota Prius is experiencing brake actuator pump failure, presenting diagnostic trouble codes C1253 (brake actuator pump motor stuck/locked) and C1256 (brake actuator pump motor overcurrent). These codes trigger ABS, brake, and VSC warning lights and disable ABS and stability control. Toyota previously acknowledged this exact defect under Customer Support Program ZJB, which covered 2010-2015 Prius vehicles for brake booster and brake booster pump assembly failures triggered by these specific codes. I am the original owner of this vehicle, purchased new in 2012. I never received notification of CSP ZJB despite being the registered owner at the time notifications were distributed in 2019-2021. My current mileage is under 150,000 miles, within the secondary coverage mileage limit established by the program. Toyota has declined to provide goodwill coverage citing program expiration. This is a known safety defect that reduces braking effectiveness and disables ABS — it should have been addressed through a mandatory recall rather than a voluntary program with an expiration date that left original owners without recourse due to failed notification.
The power brake unit and actuator are failing.
Almost had an accident due to the brake master, actuator and booster pump assemblies, failing. There were no warning lights alerting me to an issue. Just lost ability to break and car shut off completely while in motion.
The brake booster and brake booster pump assembly (also referred to as the Accumulater or Accentuater) have failed in my vehicle the same as Toyota's known defect that was mentioned in their Customer Support Program 20TE07 (part numbers can be found within the filing of their CSP 20TE07). I am reporting that this issue appears to have affected more than their initial estimate of ~118,960 states impacted vehicles.l because Toyota is declaring my vehicle is outside of their CSP 20TE07 although their defect endangers my safety (and the safety of others) and attempts to put their defective vehicle brake parts as my financial burden. This issue should have been/should be a larger recall. Thank you.
2012 Prius with 174,344 miles in great condition, with regularly scheduled oil changes. ABS/Break Actuator failure on freeway with no warning other than a beep a few seconds before the breaks disappeared completely. Break pads changed 4 months ago and new wheels installed as well. This is a known problem with Toyota under the TSB002419 where Break booster actuator was put on a customer service program to be fixed by the dealerships, but has since expired since 2022. The cars are still known to have their breaks go out due to this malfunction but it is now not covered by Toyota and cost $4K-$5K to fix which is more than the market value of the car today. This needs to be fixed and regulated.
Questions about the 2012 Toyota Prius brakes
Does the 2012 Toyota Prius have brakes problems?
Owners have filed 201 complaints about the brakes of the 2012 Toyota Prius, 47% of all its complaints, more than any other problem.
At what mileage do 2012 Toyota Prius brakes problems start?
The typical (median) mileage in owner complaints is 95,755 miles.
Was there a recall on the 2012 Toyota Prius brakes?
There is no recall for this problem on this model year.
What year does the Toyota Prius have bad brakes?
The Toyota Prius model years with the most brakes complaints are 2010 (1,945 complaints), 2008 (391 complaints) and 2007 (331 complaints).
Other 2012 Toyota Prius problems
Electrical 52Lights 36Engine 32Visibility 30Airbags 28Body 23Transmission 21Fuel system 17Acceleration 13Steering 13Driver assistance 12Seat belts 11Suspension 8Seats 6Wheels 5Tires 1
VIN decoder
See the problems and recalls for an exact car
Buying a used 2012 Toyota Prius?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history