Brake pump failed while on the highway. Brake functionality and braking distance changed drastically while driving high speeds. Dealer confirmed that the breaker pump and master cylinder must be replaced with a new assemblies. There was no recall for this failure, but a Toyota Customer Support Program for replacement of this brake assembly was active for reports of this failure only before April 2023. Toyota dealerships are not obligated to cover this replacement or make customer aware on any suspected vehicle unless the failure was present before April 2023. Warning lamps only appeared at brake pump failure - not before failure.

- Jersey City, NJ, USA

BRAKE BOOSTER AND BRAKE BOOSTER PUMP ASSEMBLIES. making a buzzing noise. cost to repair is estimated to be 2500 or more. Toyota even has a bulletin for it, but they did not inform the public, because the part is very expensive and difficult to fix on a prius. since it has expired, we are out of luck.

- Hacienda Heights , CA, USA

The brake accumulator and brake actuator failed while driving and lost brakes. I had to step on the pedal very hard to avoid a collision. Check engine light C1391 came

- Temecula, CA, USA

Brake system failure. Traction control light, brake light, abs light, and brake system warning light all lit up on dash. The regenerative braking is no longer working or charging battery. Obvious loss of stopping power. Does not feel safe to drive at all. Toyota wants $3,000-$4,000 for the repair. Toyota should be held liable for these failures causing crashes and potential fatalities. This should already be a recall.

- Atmore, AL, USA

Factual Background: I purchased the vehicle on May 2, 2023, with approximately 61,000 miles on the odometer. On October 22, 2023, the vehicle displayed Diagnostic Trouble Code (DTC) 1391, which is a known issue with Toyota Prius vehicles. Currently my vehicle currently has approximately 86,000 miles on the odometer. I first contacted Toyota on October 27, 2023, and spoke to Tier 1, Tier 2, and ultimately to a Tier 3 support representative. I was told that I could not escalate further, but that a supervisor would do a one business day call back. On October 30, 2023, I received a call back from a supervisor who escalated my case to the Executive Office. On October 31, 2023, I received a call from the Executive Office and asked for their address in order to file a formal complaint. On that very same day, I went to Peterson Toyota to have them confirm DTC 1391, which they did and my visit and paperwork is recorded within your internal system via Toyota Information System (1TIS) per the dealership. I am requesting that Toyota fix the known and now verified defective brake booster and brake booster pump in my vehicle at no cost to me, the consumer, pursuant to the Magnuson-Moss Warranty Act and implied warranty of Toyota-??s products. Again all of the details regarding my vehicle and its history are found on Toyota Information System (TIS). There have been several complaints about this known issue and an investigation needs to be reopened regarding this ongoing issue. Several class action lawsuits are getting settled before consumers have a chance to hold Toyota liable. 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. Too many people-??s lives matter.

- Kuna, ID, USA

What component or system failed or malfunctioned, and is it available for inspection upon request" Brake Booster and Brake Booster Pump Assembly have failed. Part are available for inspection. How was your safety or the safety of others put at risk? Had trouble stopping on the highway and at intersections. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear" No. Problem happened before warning lights appeared. Later, problem was verified with error codes, dash lights, and sensation of brake action.

- Austin, TX, USA

Brake booster defect caused ABS and brake light went on, thus we lost ABS while driving. Initially we heard noises while breaking in April 2023, told to change break pads. We went in to Toyota dealer again in Oct 2023, and diagnosed with brake booster problem, leaking gas inside. Toyota knew that its brake booster has a defect in design and has customer support program as a post failure solution vs recalls as a preventative measure. We were never informed about this customer support program regarding defect in brake booster. Toyota declined to repair saying my car already missed the time window (10 years since first use). Toyota should recall brake booster assemblies for Prius 2010-2015. In my case, due to delay in diagnosing this serious problem, I was put on a serious financial burden to pay for this repair ($2800 quoted by Toyota dealer). I was also put on a life threatening risk of driving a malfunctioning car for a long time without being informed. Since the beginning of this incidence, I-??ve called Toyota four times and Toyota acknowledged that they did not inform me and Toyota dealer failed to make a proper diagnosis on time to repair.

- San Marino, CA, USA

To whom may be concerned, The car I own is Toyota Prius 2013, it has the brake issue nearly a year: I can hear the brake booster pump works every 8 seconds, and the worse thing is the car is jump and has a longer brake distance when I step on the brake paddle. I even nearly had a incident at the intersection because the brake lag. I know Toyota has customer support program ZJB, and I also brought my car to Toyota Dealer. But they say they can replicate the issue. But according to the program, it must be some light on to be qualified. So now I have to take care of over $3000 bill by myself, otherwise I have to take a risk to drive my car with the brake issue. I searched online, there are a lot of customers have the similar issues like me. So Toyota has already known this issue, but why they just still wanna those cars running on the road, brake system is the most important part, it's Disregarding human life. Thanks for your time. Best Regards [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Fontana, CA, USA

The brake actuator keeps buzzing every 3 seconds or so the entire time the car is on and even after I turn the car off and get out. The brakes make a wierd burping noise and the pedal depresses with each noise if I am stopped at a red light or stop sign with my foot on the brakes. All of the brake, abs, and traction control lights lit up. The regenerative braking is no longer working.

- Longview, TX, USA

I was driving around 65 miles per hour on the highway, when I suddenly feel my brake were not working properly. Brake light, abs and traction light were shown at the same time. I almost felt like it was kind of break failure. Break would only work if i push all the way to the floor.

- Grand Prairie, TX, USA

When the car was being driven on a surface road, the ABS, Brake and Traction lights came on. The brakes became stiff and hard to press. Braking was also slow. Car was traveling at less than 30 mph at that time When taken to the mechanic shop, and running diagnosis, the code came back to be C1391. The car has 113000 miles and purchased in July 2013.

- San Jose, CA, USA

The contact owns a 2013 Toyota Prius. The contact stated that while his wife was driving at 35 MPH, when the contact's wife depressed the brake pedal, the brakes were inoperable and inadvertently all the warning lights illuminated on the control; however, the wife then let off the brake pedal and then depressed the brake pedal again and was able to stop the vehicle. The contact stated that the wife was able to safely drive the vehicle to their residence. The vehicle was taken to an independent mechanic, where it was diagnosed as having an ABS control module failure and needed to be replaced; however, the vehicle was not repaired. The manufacturer was made aware of the failure; a case was filed, but the manufacturer provided no assistance. The failure mileage was approximately 93,000.

- Meadow Vista, CA, USA

Back in May 2022, my Toyota Prius experienced issues with the braking system. I lost braking power while driving, the brake experienced a loss of power and felt very squishy to press. I had my car towed to a nearby auto shop who examined the vehicle but could not resolve the issue and recommended I take the car to Toyota. This third party auto shop reset the computer diagnostic system and cleared the error codes. When I towed the car to Toyota, the braking issue had miraculously resolved - but without the active error codes - Toyota refused to make the extended warranty repairs to the braking system that are a widespread and known issue. I continued driving the car without issue until 8/13/23 where the brake lights went on while driving and the same squishy brake issue occurred again. Toyota looked into it and determined it was related to the extended warranty braking issue, but my cars extended warranty ended on 6/29/23 - just over 6 weeks ago. Toyota refused to honor the extended warranty even though the issue first occurred in May 2022. They estimated the repair would cost $3000. I would like to have Toyota honor their agreement to extend the warranties of this braking issue.

- Boynton Beach, FL, USA

Brake Booster Pump failed on August 5, 2023 in parking lot, as found by dealership in Marion, IL. ABS, Brake, and Traction lights were on. Vehicle has been properly maintained at dealership. Before that, the brake was making weird noises when depressed. When braking, it tends to lunge forward before slowing down. Dealer deemed vehicle not safe to drive. They showed me the primary and secondary warranty internal documents, up to 150K. My vehicle is at 150400. How could that 400 miles make any difference? But Toyota refused to cover the cost of repair at over $3000. It is clear Toyota and dealership know all along that there is an ongoing problem with their braking system. I am glad this did not happen on a highway. But other owners must be made aware of this ongoing safety issue. Something must be done to have this recalled. Many thanks for your inquiry and oversight of the issue.

- Carbondale, IL, USA

Have an issue with the Prius having the error code C1391. The dealership refuses to fix the issue since it's unsafe to drive with the brake failing. Need to replace the Brake Power booster and ABS Pump/ Motor; the total cost to get all this is quoted by the dealer as $3300

- Tempe, AZ, USA

Brakes are failing intermittently. There was a recall but they say we missed the deadline.Brake booster is obviously defective makes noises constantly.

- Johns Island, SC, USA

The brakes on my 2013 Toyota Prius suddenly quit working normally, requiring significantly more force to stop. The car has been inspected by the dealer, who pointed it to what is apparently a common problem with the car -- failure of the brake booster/master cylinder assembly and the brake booster pump assembly. Half of the dashboard lit up when the problem occurred. No warning before.

- Marietta, GA, USA

I drove myself and two neighbors to a restaurant for dinner when my traction light came on momentarily but did not stay on. We had dinner and when I went to back out of the parking stall, I felt like I did not have brakes. Since it was approximately 9 pm and I was no where near a service station, I drove very slowly because I was unsure I could get the car to stop. The traction light, the brake and ABS lights were on, as well as a loud beeping alarm. I drove in the right hand lane so I could pull off the road if I could not get the car to stop. I managed to get us home and Toyota Dealer was called the next morning. They towed the car to Dealer who sold the car to us in 2015, and where it was serviced on a rigid schedule. We had an extended warranty even after it passed the 100,00 mile mark. We bought an extended warranty beyond the original warranty but were upset to find that it did not cover the brakes! It cost $2654 to replace the ABS booster and brake cylinder. When I asked the Dealer to adjust our costs as brake failure was the most reported complaint on the 2013 Prius, I was told there was a 10 year /or 150,00 mile rebate program that had expired that started in 2010, but since we had not had any reported problems during the time, there was nothing they could do to help. I asked why they had never sent us a letter knowing there was a possible brake program, and was told ALL 2013 Prius owners were felt to be affected. Our Prius now has 154,000 miles on it. I explained how I, and my neighbors, could have easily been rammed from behind, or not stop at stoplights causing ourselves and others to be harmed but they insisted there was nothing they could do.

- Lady Lake, FL, USA

Approaching a red light brake failed to stop the car. I lost pressure on the brake pedal. No body was hurt. Suddenly all brake, abs and traction control lights came on at once. Toyota dealer told me i needed to replace the brake booster pump and that it was common on those cars

- Lenexa, KS, USA

While driving suddenly the traction control light, the ABS light, the Brake light, and the Master warning light went on. I was able to pull off the road and stop by exerting an abnormal amount of pressure on my brakes. The vehicle was towed to the dealer where it showed code C1391. Toyota service bulletin T-SB-0024-19 addresses this saying it is caused by an internal brake fluid leak inside the brake booster assembly with master cylinder. Toyota is aware of the problem and has redesigned the parts. This is a dangerous problem with 2011-2015 Prius vehicles.

- Longwood, FL, USA