Problem 1. Both curtain airbags on the passenger side deployed while no one was sitting in those seats, no injuries sustained to anyone. This happened one time as it happened in a car accident, nothing indicated that the air bags were on or active at the moment. Problem 2. ABS system failure has caused the brakes on the prius to lock and not work while driving, almost causing an incident. The car has not been driven since for the fear of that happening again. The vehicle has been seen by a mechanic to determine it is the abs system. The ABS light has been on as well, it appeared a couple of weeks before the brakes locked up back in March of this year.

- Carrollton, TX, USA

Brake booster failure; actuator and pump replacement needed.

- San Antonio, TX, USA

Took vehicle for state inspection on 2/13/2024, failed inspection because of brake warning lights. Slip indicator, Electronically controlled brake warning light, Brake warning light, Anti-lock brake system, and Low tire pressure lights are all on. I have looked into it, and it seems the brake actuator/booster used to be under warranty, however since this is a 2013 in 2024 with almost 210k miles on it, it no longer qualifies for the original recall.

- Sunderland, MA, USA

I was driving my 2013 Toyota Prius last week when my my dashboard lit up with the Brake, ABS, and Traction Control lights all going on simultaneously. Shortly thereafter, I attempted to brake, as a car stopped in my lane to make a left hand turn, and the brakes did not engage as they should. I had to press twice as hard for very limited braking; my braking distance increased substantially and I narrowly avoided hitting the turning car in front of me. I drove it directly to the dealership and they diagnosed it as a failure of the Brake Master Cylinder Assembly and Brake Booster Pump Assembly (code C1391). Upon further research, I found that Toyota had previously acknowledged the problem and issued a warranty extension (Customer Support Program ZJB) that covered up to 150,000 miles or 10 years. While my Prius is well below the mileage requirement, I am beyond the 10 year limitation by less than 6 months. By Toyota's own admission, the Customer Support Program covered approximately 946,100 vehicles. This part failure put the safety of those on the road in front of me-?"and me-?"at risk.

- Princeville, HI, USA

The 2013 pruis has developed the notorious brake booster fault triggering the brake light abs light and traction control light to stay illuminated. Toyota has many complaints about this brake booster issue and needs to recall and fix this issue as they have done on other Toyotas. This is leaving owners with a $2500 repair or having to take a big risk driving these cars with a big prevalent brake issue that Toyota needs to be held accountable for.

- Hampton, GA, USA

While driving on a highway overpass, the brake booster system suddenly failed in my 2013 Prius on March 12, 2024. The vehicle displayed Diagnostic Trouble Code (DTC) 1391, which is a known issue with Toyota Prius vehicles. Toyota offered an extended warranty for this repair that expired in August of 2023, admitting that their vehicles contained faulty parts. There have been several complaints about this known issue and an investigation needs to be reopened regarding this ongoing issue. Will someone from the NHTSA please start an investigation or facilitate in any way to get an investigation into to this reoccurring issue. Brakes matter and society is depending on government and corporations to be transparent and ethical. The FTC, BBB and Attorney General-??s need to act on behalf of everyone in keeping our roads safe and holding Toyota accountable again. This is absolutely a major safety issue that should be covered by Toyota regardless of when it manifests.

- Austin, TX, USA

- The Hydraulic Brakes, or brake actuator, failed. I have taken it to my local mechanic and they confirmed. - My brakes are operating at a substantially reduced capacity - an emergency mode that only allows for the front brakes to work - Yes, my local mechanic confirmed the problem - It has only been inspected by my local mechanic - yes, several warning lights came on while I was driving.

- Austin, TX, USA

The brake pump which pressurizes the nitrogen accumulator kept cycling on more and more frequently until it was cycling on every 8 seconds after stopping while trying to maintain pressure in the automated brake system. Brake pressure began pulsating when applying brakes and was slowly becoming noticeably more unstable as time progressed. I could also hear a steady flow of fluid through the booster/master cylinder unit. This seems to be a common issue often being discussed online in forums like -??Prius Chat-??, an online car community describing the characteristics of the power brake system in this vehicle before it fails as well as with a number of online youtube mechanics replacing these units. It seems as though the solution is for dealerships to charge in many cases more than 4000 dollars to replace both the entire -??Brake Booster Assy, w/Master Cylinder-?? and the -?? Pump Assy, Brake Booster-?? as standard procedure. I believe it-??s the -??Brake Booster Assy, w/Master Cylinder-?? unit causing the issue, I do all my own repair work on my vehicles and I partially disassembled the booster/master cylinder unit, upon removing the cover for the circuit board control unit integrated into the assembly I discovered evidence of an overheated or corroded circuit board. The soldered pins for the main bus connecting the wiring harness to the circuit board showed possible charing and discoloration as well as very dull colored soldered joints. This was also observed at the bottom of the circuit board as well. After replacing both assembly units in the vehicle the brakes work flawlessly again. I was told by the parts salesman at the local Toyota dealership that he had been selling a lot of these replacement units lately.

- Thousand Oaks, CA, USA

Power brake, electronic systems around braking, brake actuator and assembly. Gradual degradation of brake power and resistance resulting in complete loss of power brakes system. Vehicle's brake system no longer works as designed. Vehicle has been inspected by technician. No warning lights or lamps in advance of total brake system shut down.

- Atlanta, GA, USA

Loss of brake function coming to a red light. 5 warning lights illuminated. Also noticed a noise that appears to be coming from the brake pump that is cycling every 3-4 seconds. 1) Masterv Warning Light. 2) Brake System Warning Light 3) Brake System Warning Light 4) ABS Warning Light 5) SLIP Indicator I have called the Toyota service advisor and will be getting a quote for repair. Apparently, I have found out that there is a class action inquiry that I would like to be included in.

- Sacramento, CA, USA

Several dashboard lights came on suddenly when braking. Upon speaking with the dealership it was determined that I experienced sudden brake actuator failure resulting in loss of braking power. Fortunately, it was not complete loss of braking or it could have been dangerous to myself and others on the road. Upon researching this issue, I have discovered that brake actuator failures are not uncommon in Toyota Prius models, and there have been numerous reports and complaints from other owners facing similar problems. This raises serious questions about the integrity of the brake system in these vehicles and the potential for widespread safety hazards.

- Green Cove Springs, FL, USA

The brake booster system suddenly failed in my 2013 Prius. I was driving when the ABS warning light, the brake warning light, and slip indicator light came on. The brakes became soft and it was difficult to stop the vehicle. I had it towed to a local, independent mechanic and the entire brake assembly had to be replaced. Toyota offered an extended warranty for this repair that expired in August of 2023, admitting that their vehicles contained faulty parts. This is absolutely a major safety issue that should be covered by Toyota regardless of when it manifests.

- South Carolina, SC, USA

As I was driving, the ABS, Brake, and Traction Control lights all illuminated on my dashboard and have remained on since. I took the car into the dealership to get a diagnosis, and they told me that I had a accumulator leak and needed to repair my brake master cylinder and replace the brake booster pump assembly. This is apparently a known issue with Toyota Prius, as hundreds of others have discussed this in various forums.

- San Francisco, CA, USA

I am the joint title owner of a 2013 Prius. This complaint is Case # [XXX] at Toyota. Our [XXX] daughter has full-time use & possession of this vehicle. In her own words, this is what happened: -??I was driving on the [XXX], about to merge onto the [XXX] in Los Angeles. This is an extremely traffic-heavy interchange. Approaching the stopped car in front of me, I applied my brakes. The brakes did not work properly. I had to press the brake pedal much harder than I normally do, & my car kept going for another two seconds or so before stopping. Three dash lights came on -?" ABS light, brake light, & light with the swerving car symbol. There was a -??puffing-?? type of sound from the brake pedal that lasted about a second, then stopped for about two seconds, then started again, & so on. That sound would come out of the pedal area regardless of whether I applied the brakes. Frightened by the brake failure, I pulled off the freeway in downtown L.A. I turned the car off & let it sit for a few minutes. When I turned it back on, the same three dash lights came back on, & the car was still not braking properly -?" still the delay, the need to press harder than usual, & the sound. I drove directly to my Toyota dealer. It was a 35-minute, nerve-wracking trip.-?? The dealer found "CODE C1391 ABNORMAL LEAK IN ACCUMULATOR." Cost of repair was $3,163.12. Note also that in 7/23, she had taken the car to the dealer with the "SAME sound" (her words) when braking. The dealer could not duplicate the problem. They did not conduct a brake test at that time. Online, I discovered that this serious safety issue had been raised in a previous petition, investigation, & customer support program that expired. This problem is the subject of a CURRENT, OPEN, NHTSA Action, # DP23005. Toyota knew of this problem, instituted a program due to safety risks from C1391, allowed the program to expire, & has left us at risk without warning. Our other daughter owns a 2014 Prius. This needs recall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOI

- Altadena, CA, USA

ABS Brake Warning Light On-stays on-this just happened within last 2 weeks. Not sure on safety measures but unsure if I keep driving it the brakes will just give out. The problem has been confirmed and seen by Tire Max but no diagnostic tests were ran. The just saw the light was on. No one has inspected the vehicle component by the manufacturer, police, or insurance company. No warning lamps prior to the problem but the ABC Warning light stays on while cranked and it first appeared about 2 weeks ago. I do want to add that a similiar recall or warranty had been put out by Toyota on Sept 4th 2020-(T-SB-0089-20) for 2012-2014 Prius V & C stating: "Some 2012-2014 model year Prius V hybrid vehicles may exhibit a condition where the brake, ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. Diagnostic Trouble Codes (DTCS) C1391, C1252, C1256, C1253 may be stored. This condition may be caused by a small internal brake fluid leak inside the brake booster assembly with master cylinder. The warranty was for Prius V or C but my Prius(no V or C) has been affected with the same issue but Toyota will not honor this warranty or recall due to the problem not showing as specific to my vin#. So I am reporting this problem so it can be submitted that there is a similar problem with my Prius as well as the Prius V or C so others could submit their problem as well. I cannot afford to fix this myself. I need Toyota to back up their cars.

- Eden, NC, USA

ABS, brake. Anti lock lights

- El Cerrito, CA, USA

I was driving home on a busy street in Houston, TX on a clear day. I tried to slow down due to traffic & the following warning lights appeared on the dash: red brake system warning and yellow brake light, ABS, brake system warning light & the slip indicator light. Right after, I came to a red light & started to brake, the car felt like it was on ice and couldn't stop properly. Fortunately I didn't have to come to a complete stop because there were many cars in front of me and the light turned green. when I stopped applying pressure to the brakes the car sort of shook side to side. Each time I had to brake, the car felt like it was on ice, I had to put the hazards on & give myself a very large amount of room to stop the car. While at a red light I turned the car off/on; no change in the dashboard lights. I turned onto a street w/ less traffic; pulled over, turned the car on/off again and no change. I was less than a mile from home so I drove the rest of the way w/ my hazards on & never went faster than about 15 mph; even at that speed the car took too long to come to a complete stop, it felt like I almost had no brakes at all. Thank God I wasn't on the highway w/ no brakes!! This is a HUGE safety issue, someone could die or be seriously injured. Had the car towed to a Toyota dealership on Mon 1/15/24; they said there was a brake fluid leak in the master cylinder & malfunction of brake booster pumps, the code was C1391; both parts needed to be replaced. Total cost for repairs $3800. Had the car towed to a mechanic, paid $2600 for the same service. Per my research this is a known problem with this generation of Prius', Toyota offered an "enhanced warranty" to replace the parts if they were broken, but the dealer said my warranty expired in 2022. Why weren't owners made aware of this issue and warranty? I would have brought the car in for repair in the past if I knew there was a defect with the car. The car should be recalled.

- Houston, TX, USA

ABS, Brake, Trac warning, and brake lights turned on. When I used a diagnostic device, I read the code C1391 code. The brakes of the vehicle are not working properly. Upon my research, I found that several factors can trigger the C1391 code, including a faulty brake accumulator pressure sensor, low brake fluid level, brake system leaks, issues with the ABS pump/motor, or electrical problems within the brake system. This problem has many safety implications. The brake system is fundamental for vehicle control and stopping power. Any compromise in its performance poses a risk to the driver, passengers, and others on the road. Prompt action is necessary to investigate and rectify the root cause of the C1391 code to ensure the continued safety of affected vehicles. I think Toyota company should issue a recall for this faulty system.

- Lakewood Ranch, FL, USA

While driving on the freeway, all of a sudden the ABS, Slip Indicator, Brake, and Brake System lights lit up on the dashboard. I immediately switched lanes to one that had no cars in front/back of me since I was going about 55mph. I tested the brakes since I saw the brake lights appear. It felt as though when the brake pedal was pushed, they didn't activate until you reached a certain point, almost to the point where the pedal needed to be fully pressed to stop. It didn't feel like the brakes were fully functional and behaving in the way they were prior to the lights appearing. I was afraid the brakes would give out. Then I noticed a whirling/hissing sound that was consistent. The sound was easier to hear when the car was at a complete stop but it could still be heard while driving. We took the car to a local Toyota dealership/service dept to get it evaluated. They diagnosed the car saying it needs immediate attention and is not safe for driving since it involves the brakes. The repair invoice stated VARIOUS BRAKE WARNING LIGHTS ON C1391.

- Kailua, HI, USA

ABS, Brake, and Traction control lights are on alongside a constant beeping. I have lost regenerative braking and it now takes more effort upon the brake pedal to come to a complete stop. I am in fear that the brake system will go out completely, causing damage to myself or my children.

- Zephyrhills, FL, USA