Service Brakes Problems of Toyota Prius - part 1

Abs pump failure. This is a known issue for Toyota Prius owners. My Prius abs pump is failing and I am losing power brakes.

See all problems of the 2008 Toyota Prius 🔎.

I am reporting a serious braking system failure involving my 2015 Toyota Prius c with approximately 63,000 miles. While driving on the highway at approximately 65 mph, the vehicle suddenly began sounding a continuous warning alarm. Dashboard warning light illuminated "brake override malfunction - visit your dealer" the break pedal became extremely hard with almost no movement, making normal braking nearly impossible. I had to move into the emergency lane and rely primarily on the manual parking brake to gradually bring the vehicle to a stop. This created a serious risk of a collision. After stopping, I restarted the vehicle several times, but the alarm, warning light, and extremely hard brake pedal persisted. The vehicle was towed to Toyota arecibo, an authorized Toyota dealership in puerto rico. The service manager personally drove the vehicle upon arrival and witnessed the malfunction, including the hard brake pedal and continuous alarm. The dealership diagnosed trouble codes c1252 and c1253 and provided a repair estimate of $2,974. Both codes are identified in Toyota customer support program 24te01, addressing certain brake booster and pump failures in 2015-1017 Prius c vehicles. Toyota of puerto rico denied the vehicle exceeding the warranty time limit, despite its low milage. I am requesting NHTSA investigate this serious safety concern, as the vehicle experienced a sudden loss of normal braking assistance at highway speed. The vehicle remains at the dealership awaiting repair authorization.

See all problems of the 2015 Toyota Prius 🔎.

Abs, traction light on , and brake light on and the brake is not working good. Need to press it hard to apply brake . It happen with out a reason. I called Toyota when I have a recall for that but they refused because it dont have any light sign on it but still it make a loud buzzing sound all time time when car runs and brakes also feels spongy . Now recall is expired I have to replace by my self.

November 2, 2026 approximately 1:37pm I was coming to a stop intending to take a left turn onto a highway. As I applied the brake the car suddenly lunged forward almost throwing me into oncoming traffic at very high speeds. I was far too close to colliding or being thrown in front of a car that was traveling in the nearest lane. They took a lane change that was thankfully clear for them to do. This specific part of the highway had a fatality crash just 3 days prior. Suddenly, lights show up on the dashboard including abs, brake, traction control and the warning light. The brake actuator assembly failed. From what I’ve seen this is a known issue that Toyota has acknowledged with a specialized warranty that my vehicle has aged out of. However the most crucial is I am well under the mileage for the part to have failed due to ware and tear. This was a manufactures fault. Tomorrow I will have the car inspected and confirmed that the failure occurred.

See all problems of the 2013 Toyota Prius 🔎.

The brake booster / brake booster pump assembly on my 2015 Toyota Prius failed due to an internal leak. The problem began in early xxx. Symptoms: the hybrid battery will not charge past about 40%, fuel economy has dropped sharply, and braking performance is degraded, putting my safety and the safety of others at risk because the car cannot brake normally. On about xxx I called Toyota customer service at [xxx] and described the symptoms; the technician said it sounds like the brake booster has failed. I also took the car to [xxx] and a local mechanic; both said the work is out of scope for them because it requires Toyota's special brake line tool - only a Toyota dealer can do the repair. Toyota previously acknowledged this defect in customer support program zjb covering 2010-2015 Prius models (diagnostic codes c1391, c1252, c1256, c1253) for 10 years or 150,000 miles; my car has just reached 150,000 miles and the program has expired. Dealer repair estimate is $2,000-$4,100. My [xxx] inspection is due xxx and the car will not pass with this brake failure. The vehicle has not been repaired yet and is available for inspection upon request. The car was received as a gift from my mother-in-law about two years ago and has never been in an accident. There was no crash, fire, injury or death. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I was driving the vehicle and a bunch of dash lights came on regarding traction control and stability and lost all brakes and almost caused an accident! the codes thrown showed a fluid level indicator and a leak in accumulator.

See all problems of the 2011 Toyota Prius 🔎.

While driving our 2013 Toyota Prius, the vehicle experienced a sudden and severe loss of braking effectiveness while the vehicle was in motion. This created an immediate safety risk because the vehicle did not respond to braking as expected. After the incident, the vehicle displayed the red brake warning light, abs warning light, brake-system warning light, and an audible warning. The vehicle was not driven after the failure and was transported to a Toyota dealership for diagnosis. The dealer confirmed a brake-system fault and recorded diagnostic trouble codes c1241, c1252, c1253, and c1256. Toyota previously issued customer support program zjb for certain 2010–2015 Prius vehicles involving internal brake booster and brake booster pump malfunctions. Toyota’s documentation for that condition identifies c1252, c1253, c1256, and c1391 as relevant diagnostic codes. This vehicle has three of those listed codes. The problem has been confirmed by the Toyota dealership. The failed brake-system components remain installed and are available for inspection at this time. There were no known brake-system warning lamps before the braking failure. The warning lamps and audible alarm appeared in connection with or immediately after the failure.

The brakes failed while driving at a high speed (55 mph) on the highway along with failing when braking at a low speed (15 mph) near a major intersection. This occured with no warning other than the brake, abs, and traction control appearing as the failure was occuring. The warning light when away after the first occurance and the brakes began working again within a few moments. It then reoccured and the lights did not turn off and the car began beeping. My safety, along with my passengers safety and the safety of those who were in the area was put at risk. The highway failure occured in a high traffic area which was also a construction zone so workers were at risk. It has been confirmed by an independent service center that the power brake booster and brake master cylinder assembly failed. There were no sypmtoms or warning prior to this dangerous failure. After researching this issue, I have found that this is a common issue but no recall has been issued, only a customer support program bulletin, of which I never received. This is extremely troubling due to the nature of brake failure at both high and low speeds can put not only the driver at risk but those who are near the vehicle experiencing the brake failure. Repairs are currently in process at the cost of approximatly $3,200.

See all problems of the 2014 Toyota Prius 🔎.

On xxx, at approximately 152,570 miles, the brake, abs, and traction-control warning lights illuminated at the same time on my 2013 Toyota Prius. The brakes felt spongy, and I heard a recurring buzzing sound approximately every 3 seconds. Because of the change in brake-pedal feel and concerns about braking safety, I stopped using the vehicle. I reported the problem to longo Toyota in [xxx], which directed me to Toyota customer support. The vehicle was subsequently diagnosed with trouble code c1391, “internal leak in accumulator. ” I contacted the dealership and Toyota customer support about customer support program zjb, which addressed code c1391 brake booster and brake booster pump failures. Toyota denied coverage because the failure occurred outside the program’s time and mileage limits. The symptoms began only 2,570 miles beyond the 150,000-mile limit. My primary concern is **safety**, not simply the expiration of coverage. The vehicle developed spongy brakes, multiple warning lights, and frequent buzzing. The diagnosis appears consistent with the type of brake-system failure Toyota previously addressed through zjb. I request that NHTSA investigate whether this condition constitutes a safety defect affecting 2013 Toyota Prius vehicles and whether a recall or other corrective action is warranted, including for vehicles that develop the failure after the support program expires. I can provide the diagnostic report and available supporting records. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The brake booster pump has malfunctioned, exactly 1 year outside of the secondary coverage supplied in the voluntary customer support program for this exact issue, despite being under 150,000 miles. Now the car is unsafe to drive since the brakes are malfunctioning.

Facing brake booster/accumulator leak at ~105,000 miles diagnosed and confirmed by a mechanic at an independent service center. Problem is characterized by a hissing and chirping sound from the brakes. No warning lights appear on the dash, but this is a known problem with the 2014 Prius. Brake system could fail at any time, preventing the car from stopping. Repair of this system requires a >$2,500 payment. Toyota had an extended warranty up to 10 years after the car was purchased or before 150,000 miles. In this situation, the problem showed up after this time (2026), preventing compensation for repairs.

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.

See all problems of the 2012 Toyota Prius 🔎.

I was driving on the highway when my 2011 Toyota Prius started beeping repeatedly, and as I approached the red light, my brakes were not operational. My car completely passed through the red light, narrowly missing what could have been a fatal accident for me and others on the road. I had to navigate to the furthest right lane, almost getting hit by others due to my speed and inability to stop my car. I was going at 50 mph through the intersection, and had to gradually lower my speed in the righthand lane. The Toyota dealership confirmed the issue with my brake accumulator, with a c1391 code. The only warnings were the brake light in the moment and the repeated beeping noise. To stop the car I had to slow down with my foot off the gas, and use my emergency brake once I could.

The contact owns a 2012 Toyota Prius. The contact stated that while driving 65 mph and depressing the brake pedal there was a buzzing sound coming from the vehicle and the brake warning light illuminated. The contact stated that after inspecting the vehicle, the brake fluid level was very low. The vehicle was taken to a service center where it was diagnosed and dtc: c1391; was retrieved. The contact was informed that a leak in the brake accumulator had caused the brake master cylinder and hydraulic power brake accumulator to fail and needed to be replaced. The vehicle was scheduled to be repaired by the service center. The manufacturer was made aware of the failure via telephone. The contact stated that the manufacturer was aware of the failure and offered an extended warranty to cover the repair. However, the part needed to be replaced. The failure mileage was approximately 81,239.

While driving, my brake pedal would randomly lose power assist. The pedal would get hard and I couldn't press it down normally, and I had to push as hard as I could just to get the car to slow down. This happened more than once while driving and I almost crashed because I couldn't stop the car in time. A scan later showed codes c1252 (brake booster pump motor on-time abnormally long), c1253 (pump motor relay fault), and c1256 (accumulator pressure low), pointing to a failure in the brake booster pump/accumulator system. A repair shop confirmed this and said the brake booster assembly with master cylinder and the brake booster pump assembly with accumulator both needed to be replaced. I also contacted Toyota and was told my car was previously covered under a warranty enhancement program for this exact part, which has since expired meaning this is a known issue with this component. The part is available for inspection if needed.

I am filing this complaint to report an active, severe safety defect involving a sudden, un-warned loss of power braking assist due to a failing factory brake actuator/booster pump assembly. My vehicle is exhibiting the exact internal hydraulic seal failure, pressure drop, and audible hissing/sipping sound outlined in Toyota's prior technical service bulletins. Because the onboard ecu computer only triggers warning lights once a complete, catastrophic failure threshold is met, the system is currently masking the defect from the dashboard. However, the physical hardware is actively failing, requiring the high-pressure pump to run constantly to maintain braking pressure. This component failure dramatically increases stopping distances and presents an immediate, unreasonable risk of a crash. Toyota previously acknowledged this widespread manufacturing defect via customer support program zjb (20ta02). However, because Toyota chose to manage this critical safety hazard through a time-limited warranty extension rather than a mandatory safety recall, hundreds of thousands of vehicles are now left with a catastrophic braking hazard because the consumer coverage expired in 2022. I urge the NHTSA to open a formal defect petition review to investigate these post-warranty failures and mandate a retroactive safety recall to protect the public.

The vehicle is experiencing a critical failure of the brake actuator and booster pump assembly. The dashboard currently displays multiple warning indicators: abs light, traction control light, and the brake system warning light (master warning "!"). Symptoms: mechanical failure: the internal high-pressure accumulator is failing to hold pressure. The electric brake booster pump is heard cycling every 10-20 seconds even when the vehicle is stationary and the brake pedal is not depressed. Loss of braking safety features: the system has disabled regenerative braking and anti-lock braking (abs), causing significantly increased stopping distances and a “spongy" brake pedal feel with diminished braking response. Predictability of failure: this failure matches the exact symptoms described in Toyota's customer support program 20te07 (and previously zjb), which acknowledges an internal defect in the brake actuator. Safetv risk: the sudden transition from power-assisted braking to manual hydraulic braking during a drive creates an immediate safety hazard. As the pump motor continues to cycle excessively to compensate for the internal leak, it is at risk of total thermal failure, which would lead to a near-total loss of braking assist while the vehicle is in motion. Despite the vehicle having only 75,689 miles (well under the 150,000 mile limit acknowledged in Toyota's support programs), Toyota has declined to provide assistance because the vehicle has surpassed the 10-year age mark. Toyota is wrong in not providing support for vehicles whose critical components such as brakes shouldn’t experience catastrophic internal failure at 75,689 miles, regardless of the vehicle's age.

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 booster/actuator assembly. This component defect causes an immediate compromise to the vehicle's braking efficiency and hydraulic pressure, causing a sudden loss of braking power and significantly increasing stopping distances. Toyota was fully aware of this dangerous defect and initiated customer support program zjb to address it. However, Toyota brand engagement center (case #260909002032) has explicitly admitted via recorded voicemail that they mailed the safety/defect notification only to a previous owner and failed to notify me. Because they did not cross-reference current registration data, I was never notified of the defect and was deprived of a preemptive remedy before their arbitrary 10-year calendar clock expired. At only 79,000 miles, this critical safety component has failed prematurely, creating an active hazard on public roads. Toyota is refusing to cover the $3,890 repair despite their documented failure to notify the current owner.

2011 Toyota Prius with approximately 134,000 miles. The brake actuator/master cylinder has been diagnosed as malfunctioning and failing to maintain hydraulic pressure. The brake booster pump initially began cycling approximately every 10 seconds while the vehicle was in ready mode, stationary, and without the brake pedal being applied. The cycling subsequently increased to approximately every 3 seconds. The affected components remain installed and are available for inspection upon request prior to repair. Because this condition involves the braking system, I am concerned about the potential for reduced brake assistance or further brake system failure, as well as excessive wear on the booster pump from repeatedly restoring lost pressure. I have limited use of the vehicle while arranging repair. An independent repair facility reproduced and diagnosed the problem. Diagnostic testing produced dtc c1391 (accumulator leak malfunction), and the brake actuator/master cylinder was diagnosed as the source of the pressure loss and recommended for replacement. The vehicle has not been inspected for this condition by the manufacturer, police, or insurance representatives. The primary symptom was increasingly frequent brake booster pump operation without brake application. Toyota previously established a customer support program addressing certain brake booster/brake booster pump assembly failures in 2011–2015 Prius vehicles, including conditions associated with c1391. The vehicle is below 150,000 miles but outside the program's time limitation.

The contact owns a 2012 Toyota Prius v. The contact stated that while driving 65 mph, brake fluid was leaking from the vehicle. While driving over 45 mph, the brake pedal became firm, requiring the driver to exert extra force while depressing the brake pedal; the brakes failed to respond as intended. Additionally, a burning and toxic odor was present during the failure. Multiple warning lights illuminated on the instrument cluster, including the abs system, parking brake, brake malfunction, and electronic stability warning lights. In addition, the automotive brake system, brake pump, and pressure warning messages were displayed. The vehicle was taken to a local dealer, where it was diagnosed with a failed brake booster assembly after inspection. The dealer determined that the brake booster assembly needed to be replaced. The contact associated the failure with customer support program: 20te07. The contact was referred to the NHTSA hotline by a lawyer, and the contact had found a class action lawsuit related to the failure. The failure mileage was approximately 187,000.

Abs and brake light are on. Was on the freeway and when I pressed the brake the wheels got locked and the car made a 360 spin, it almost flipped over.

The brake booster assembly failed, as many of these models had before. A bunch of codes went off as I was driving and the brakes did not function properly. Toyota had an extended warranty for this which they discontinued last year and they would extend no good will towards the $4,000 repair.

While driving my 2014 Toyota Prius, the brake, abs, and vehicle stability/traction control warning lights illuminated. There was no crash, injury, or noticeable loss of braking before the warnings appeared, and there were no preceding symptoms. The vehicle was evaluated by mac haik Toyota in league city, TX, an authorized Toyota dealer. They diagnosed dtc c1391, “abnormal leak of accumulator,” and determined that the brake booster and brake booster pump/accumulator assembly require replacement. The dealer advised that the vehicle cannot be driven and is considered down. The vehicle/components are available for inspection upon request. My safety concern is that this is a brake-system malfunction serious enough that an authorized Toyota dealer has determined the vehicle cannot be driven. Toyota previously established customer support program zjb addressing internal malfunctions of the brake booster and brake booster pump assemblies in 2011–2015 Prius vehicles. Toyota’s documentation specifically identifies c1391 as a diagnostic code associated with this condition. My Prius has only approximately 102,000 miles, well below the program’s 150,000-mile limitation, but is outside its 10-year time limitation. The Toyota replacement part required to repair the brake system is now backordered with no known timeframe for availability. Because Toyota has advised the vehicle cannot be driven, it will remain out of service until the part becomes available. I am reporting this because a previously identified brake-system failure continues to occur after Toyota’s support period expires. I ask NHTSA to consider whether continued c1391 brake booster/accumulator failures in these Prius vehicles warrant further investigation or safety action.

The break pump for my 2013 Prius is going out and is a known issue with Toyota. I contacted Toyota and they have stated because it is past the extended warranty they can not repair it and aren't liable for it. I bought the car used and was unaware that it has been a known issue for years. The previous owner did not have it replaced as they were probably unaware as well. It is a highly unsafe issue and has caused my breaks to suddenly go our while driving recently with my toddler. It is also $3000-$5000 to fix it and is almost more than the cars value. I need help resolving this as it isn't "normal wear and tear" or a mileage issue. It is a known, very public defect that Toyota has admitted and I have been able to easily find information on all over google. The warning lights came on out of no where on the freeway today.

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. Rec[ommend] brake actuator and booster pump assembly [replacement]. ` servco Toyota dealership in hawaii report: submitted prior authorization request with Toyota hawaii warranty. Request denied for goodwill coverage on abs actuator and booster pump.

Subject: vehicle safety defect complaint / request for investigation review vehicle: 2010 Toyota Prius VIN: [xxx] component: electronic brake booster / pressure accumulator assembly dear administrator, I am writing to formally report a critical safety defect in my 2010 Toyota Prius regarding the electronic brake booster and accumulator pump assembly. This component exhibits classic failure symptoms—specifically a distinct puffing, ticking, and pressure-loss noise directly from the brake pedal mechanism—which points to internal nitrogen or hydraulic pressure leakage. This component was previously the subject of Toyota’s customer support program / safety recall (campaign zjb / d0h) due to fatigue cracking in the internal accumulator bladder. However, Toyota's arbitrary cutoff timelines have left me completely unprotected, even though the underlying engineering defect remains identical and poses an active, catastrophic threat to public safety. The real-world implications of this failure are severe: •daily risk to life: I am a self-employed small-business owner who relies on this vehicle daily to travel between clients across the greater [xxx] area. Because of this failing component, I experience profound fear every single time I drive that I will completely lose my brakes in heavy traffic. •financial barrier to remedy: authorized Toyota dealerships have quoted me several thousand dollars for the repair. Due to a 40% drop in my business income amid the soaring cost of living in [xxx], I cannot afford this repair, nor can I afford a rental car or alternative transportation. My car is my literal lifeline, forcing me to drive a vehicle with a compromised, safety-critical braking system. •unfair expiration of safety remedies: my vehicle was serviced by authorized Toyota dealerships twice during the active primary campaign window (on xxx at 36,675 miles, on 08/30/2019 at 41,238 miles), where recall status checks were routinely requested information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(.

See all problems of the 2010 Toyota Prius 🔎.

Component failed: brake actuator and accumulator on a 2010 Toyota Prius. It is available for inspection upon request. Safety: abs, traction, and brake lights turned on suddenly in the middle of rush-hour traffic, followed by a spongey, hard-to-press pedal. Braking distance and efficiency was greatly impacted, and driving to a safe turn-out was extremely dangerous as I feared the brakes would give out entirely at any moment. The problem has been reproduced and confirmed by a dealership. Unknown. Requested an inspection by the manufacturer but their "customer support program" for the brake actuator and accumulator expired 10 years after the car's production date. After speaking to both the dealership and corporate, they have informed me that there is nothing else they can do in regards to reimbursement or satisfying the complaint. The only symptom of the problem prior to failure was a periodic hissing noise coming from the brakes. When the car was brought in for the catalytic converter in late 2025, the dealership failed to diagnose any issue with the brake booster system at that time.

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 Prius suddenly slid sideways toward the adjacent lane, bringing the rear passenger side dangerously close to another vehicle. Had I begun braking at my normal stopping distance, I believe a collision would have occurred. No crash or injuries occurred, but the incident was extremely dangerous. I drove the vehicle very slowly to purrfect auto services, [xxx], where the brake/abs system was diagnosed. I observed diagnostic code c1391. The shop has had the vehicle since xxx and has experienced repeated problems with used replacement brake-system components that were defective or would not function properly. The vehicle has remained unsafe to return to service while the shop works to obtain a properly functioning replacement part. I am reporting this because the sudden and unpredictable braking behavior created a serious risk to my family and other motorists. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I purchased a 2013 Toyota Prius from a reputable dealership in omaha (o'daniel Honda). 5 days after purchase the abs, brake, and traction control lights came on in the evening. When I took it to the dealership the next day they had cycled off and the dealership couldn't find anything wrong. A few days later it happened again so I got into the dealer right away and they said Toyota had issued a service bulletin c1391 in 2019, and that I would have to replace the brake booster, brake cylinder, and brake pump assembly. I'm still fighting with the dealership to make this right, because they should have caught this during their inspection before putting the car for sale on their lot. The indicator lights keep cycling on and off. Something that effects the braking system should be a recall and not a service bulletin.

The contact owns a 2013 Toyota Prius. The contact stated that while driving 60 mph, the abs warning light illuminated. Minutes later, the vehicle started to brake and lurch forward with the accelerator pedal depressed. The contact stated that the vehicle spun out and crashed into the median. The contact’s chest struck the steering wheel, causing bruising and chest pain. The contact was managing the pain with analgesics. The vehicle was towed to an impound lot and was deemed a total loss by the insurance company. A police report was filed, but the report number was not provided. The manufacturer was contacted and was made aware of the failure. The failure mileage was approximately 140,000.

The contact owns a 2013 Toyota Prius. The contact stated that while driving at an undisclosed speed, the abs, traction control, and brake warning lights were illuminated. The contact pulled off on the off-ramp and became aware that extra effort was needed to depress the brake pedal. The vehicle was towed to the dealer and was diagnosed with brake booster and accumulator failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 120,000.

Vehicle information: 2011 Toyota Prius, 144,000 miles. Component: hydraulic service brakes, electronic stability control, anti-lock braking system. Description of incident: while driving at normal speeds, the vehicle suddenly experienced a severe reduction in braking capability. The dashboard simultaneously illuminated the brake warning light, abs light, and slip/traction control indicator light. The brake pedal immediately became soft, spongy, and squishy, requiring significantly increased physical foot pressure and a vastly extended distance to bring the vehicle to a stop. Upon inspection, the brake fluid reservoir remains completely full, but the brake booster pump under the hood cycles and buzzes rapidly every 10 seconds while stationary. A diagnostic scan confirmed trouble code c1391 (brake actuator internal leak). This indicates a severe internal hydraulic pressure bleed inside the braking module. [see attached] this is a known, widespread manufacturing defect previously documented under Toyota customer support program zjb. The manufacturer has refused to remedy this life-threatening safety defect because a 10-year calendar threshold has passed, despite the vehicle being well under the 150,000-mile limit established by the manufacturer. The vehicle currently poses an immediate safety risk to occupants and the public.

Code dtc c1391 - abnormal leak of accumulator pressure. Internal failure of the brake booster pump assembly, preventing the system from maintaining proper hydraulic pressure. This means the brakes don't work, putting the driver's and passengers' lives at risk. This dtc c1391 code and problem were reproduced and confirmed by an independent service center who specializes in 3rd generation Priuses. There were warning lights that lit up when the brakes failed - the abs, traction control, and brake light all lit up but only after the brakes had stopped working. This is a known manufacturer defect but Toyota won't pay to fix it because they put a 10 year limit on first driven date or 150,000 miles. This Prius only has 100k miles but Toyota still won't stand behind their product even though they have admitted it was a manufacturing defect and they sold a defective product.

N/a.

Brake actuator had been making noises and it finally stopped working on 7/14/26. Thankfully my car was and stopped and parked. The car has 137k miles on it, one owner and no explanation of what caused this. There were no accidents, abuse, or failure to maintenance.