I am writing to express my concern regarding an issue with the PCS System dash lights on my 2010 Toyota Prius. I recently became aware of problems related to the brake booster system, which I understand have been addressed through recalls or warranty extensions on certain models. I believe that the issue I am experiencing should be covered under warranty, and I kindly request your assistance in resolving this matter.

- Carlsbad, CA, USA

I drove the car to my destination without any issues. An hour later, when I restarted the vehicle to leave, the following dashboard lights were on (slip indicator, ABS warning light, and brake system warning light). When I drove the vehicle, the brakes had diminished stopping power. It took farther for the vehicle to come to a full stop when applying the brakes. When we had it checked by the Toyota dealer we were informed that there was an abnormal leak in the accumulator assembly (system diagnostic code C1391) and it would need brake booster/master cylinder assembly with accumulator pump replacement.

- Bentonville , AR, USA

Brake booster, brake accuater went out even after the recall. Dealership said they could do nothing to help

- Lawrenceville , GA, USA

While driving at a high speed in the left lane of a 2 lane interstate a car in the right lane merged into me. Luckily I was able to brake in time to avoid a collision, unfortunately the sudden braking at a high speed caused my car to loose all control. Upon braking my front tires lost all traction and shifted my car to the right, I remained horizontal sliding across the highway for an unrecognized distance (my guess is 10-20 meters), before shifting another 90 degrees to the right leaving me backwards. At this point I had shifted across both lanes and the emergency lane, I was backwards in a grass border on the right side of the interstate. If this had been any other sort of barrier I may not have Lived. This incident has not been reproduced or confirmed by a dealer or independent service center. The vehicle had recently had its worn brake components replaced in response to a similar incident happening, which I first attributed to worn brakes-?" this theory was supported by the brake technician prior to service. I have had a tire pressure light on since I purchased the car, but this was explained to me as a malfunctioned TPS.

- Asheville, NC, USA

Break booster fail. Will cause the breaks to fail. There was a voluntary recall on these but I never recieveed the letter in the mail. Thr break booster failed after the voluntary recall was up. Toyota said they cannot help with this. Other prius owners i talked to have the same issue with their 2010 prius break boosters and also did not get the letter in the mail.

- Decatur, GA, USA

Abs lights on, traction light on.Actuator running cicle constantly. Breaks felt spongy

- Cathedral City, CA, USA

My car, a 2010 Toyota Prius, Level V has about 161,000 miles on it, and I have driven about 140K of those miles over the last 13 years. I have traveled around the DC/Maryland area and also taken the car on long trips. The car has been reliable, safe, and predictable... EXCEPT in one place/instance. I have probably driven a dozen times or more to the BWI airport from my home in Chevy Chase. On the return drive on [XXX], as I drive towards an overpass that is just before the [XXX] exit, my Prius goes into "Emergency Approaching Collision" mode. The brakes automatically forcibly apply, the seatbelt/lap harness grab me, and there is an emergency beeping from the system. The first time this happened... probably 10 years ago, it was very startling. My car was traveling about 60-65 mph. Luckily, there were no cars behind me... and I remained calm enough not to overreact. I was so startled that I needed to pull over to regain my composure. In one of the numerous other cases on this happening, my wife was in the car and she basically wanted me to sell the car because she felt it was unsafe. Because I am aware of the situation with my car, I always am cautious when I am driving towards the [XXX] exit. I drive slower, watch carefully for surrounding vehicles beside or behind me. But even yesterday, I was driving very slowly (approximately 35 mph). While I did not feel the system take aggressive avoidance/safety actions, still the warning beeps did take place... a little unnerving, but I had come to expect a problem at that site. In any event, I did want to bring the matter to your agency. Sincerely, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Chevy Chase, MD, USA

ABS Pump/Motor failed. Lost power and control over the breaks. ABS light

- Cathedral City , CA, USA

I was coming to an intersection where two cars were waiting for a right turn. I pressed on the brakes and nothing happened. The car continued to move without slowing down. The brakes felt "blocked" and unresponsive. I engaged the manual break at the last moment and that slowed me down. But I still hit the car in front of me which in turn hit another car in front of it. The police report says "following too close". But I was not following other cars. The two cars were already at the intersection. I was just coming to this intersection and attempted to slow down as usual. Except that the brakes did not respond. My car was a total loss.

- Athens, GA, USA

Twice while I was driving on the highway, my ABS and brake light came on, and my brakes became less sensitive to pressure. That is to say, it took more effort and I had to push my brakes further towards the floor in order for them to respond. I went to an independent mechanic and got the code C1391 which indicates a brake pump accumulator issue. I went to a Toyota dealership and and had the car inspected. They confirmed the C1391 code and said the brake booster assy with master cylinder pump assy was malfunctioning. However, I was never told by Toyota that this issue meant my brakes could fail at any time. My safety and the safety of others was put at risk because my brakes spontaneously became less responsive, my stopping distance was increased, and they were at risk of spontaneous failure.

- Asheville, NC, USA

I recently had an issue with the brake actuator on my 2010 Toyota Prius, showing error code C1391. This caused reduced braking efficiency, and research shows it-??s a common safety concern with Priuses. While there was a recall, it has expired, leaving owners like me without support. I kindly request an investigation to address this critical issue for the safety of all affected drivers.

- Fairfax, VA, USA

My brakes stopped braking but luckily I could drive slowly into a curb in my neighborhood. God knows what could-??ve happened if I was on the freeway. All the dash lights came on at the same time so I ran some codes; it came back C1391 - the brake actuator is broken. Toyota will not cover it despite this being a very common issue. My car is undriveable until this gets fixed because it will not break.

- Taylorsville, UT, USA

Please read the attached file "prius complaint signed" for a full description. I am the owner of a 2010 Toyota Prius, 2ZR-FXE. The warning light came up on my dashboard of my vehicle, so I took my 2010 prius to AutoZone, to get a free diagnostic. The diagnostic indicated the problem code of -??C1256-?? -??Accumulator Low Pressure-?? for the -??Anti-Lock Brake System.-?? See Ex. A (AutoZone Diagnostic). It is available for inspection. According to the safety recall number -??D0H-??, 2010 prius model -??2ZR-FXE-?? has a -??Brake Booster Pump Assembly which can develop a crack inside the accumulator housing. If this occurs nitrogen gas could leak into the brake fluid and gradually cause a loss of power assist. Under certain circumstances, THIS COULD AFFECT STOPPING DISTANCE AND INCREASE THE RISK OF A CRASH.-?? (Emphasis added). I have noticed that when I brake hard, IT TAKES LONGER TO COME TO A STOP, WHICH THREATENS NOT ONLY MY LIFE, BUT THE LIVES OF MY WIFE AND TWO [XXX] DAUGHTERS WHO ALSO RIDE IN THIS VEHICLE. According to the safety recall, -??Toyota dealers will perform an inspection and, if necessary, replace the Brake Booster Pump Assembly at NO CHARGE to the vehicle owner...-?? See id. The safety recall does not explicitly permit dealers or servicers to charge for an inspection with regards to this defect, according to the information provided me. The estimate, provided by DARCARS recommending replacement of the -??BRAKE BOOSTER WITH MASTER CYLINDER WITH PUMP[,]-?? confirms that the issue appears to be that which is covered by the safety recall. Ex. F.; see also Exhibit B Safety Recall (The vehicle has a -??BRAKE BOOSTER PUMP ASSEMBLY WHICH CAN DEVELOP A CRACK INSIDE THE ACCUMULATOR HOUSING...-??). See also Exhibit E Error Code from DARCARS (-??C1256 Accumulator Low Pressure-??). Nevertheless, DARCARS refused to waive the diagnostic fee of $150 and would not repair the vehicle unless I paid them -??$5,150.-?? See Exhibit F. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Rockville, MD, USA

The contact owns a 2010 Toyota Prius. The contact stated while driving approximately 40 MPH and depressing the brake pedal, the brake pedal was stiff and required excessive force to depress. The contact stated that the ABS, Stabili-trac, and Parking Brake warning light was illuminated. Additionally, the contact stated that a chime sounded and could not be turned off. The contact stated that the failure had been intermittent but was a recurring failure. The contact had not taken the vehicle to a local dealer or independent mechanic. The vehicle was not diagnosed or repaired. The contact researched online and related the failure to NHTSA Campaign Number: 13V235000 (Service Brakes). The manufacturer was not informed of the failure. The failure mileage was approximately 77,000.

- Fort Lauderdale, FL, USA

hope this message finds you well. I am reaching out regarding a potential recall issue with my 2010 Toyota Prius. The vehicle's VIN is [XXX], and I am currently located in the Austin area. Recently, my vehicle has been experiencing problems related to the brake system, specifically the brake booster pump assembly. The diagnostic results returned codes C1241, C1391, and C2300, which point to issues such as abnormal leaks in the accumulator pressure and actuator system malfunctions. Given that this issue may fall under a recall or extended warranty for the brake booster pump assembly, I would appreciate it if you could confirm whether my vehicle qualifies for this service. If it does, I would like to schedule an appointment to bring my car into the nearest authorized service center to have the necessary parts replaced. Please let me know if any additional information is needed. I look forward to your response and would greatly appreciate your assistance in resolving this matter as soon as possible. Thank you for your time and support. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Pflugerville, TX, USA

Toyota failure to honor recall. See correspondence below for NHTSA ID and other detail. NTHSA Recall ID: 13V235000 Toyota Case#: [XXX] Very dissatisfied with Mr. Lxxxx's denial of our inclusion in the customer support program. He seemed to reach for every imaginable escape hatch to say "no". Claiming 2 notices were sent out (to the correct address) between December 2017 and March 2018, neither of which reached me, is dubious to say the least. The likelihood of our remaining a Toyota "family" with the eventual replacement of our 3 vehicles (including a previously unmentioned 2017 Rav4) has shrunk considerably. Shame on Toyota North America. ---------------------------------------------------------- (earlier Monday, October 21, 2024 at 11:31:54 PM EDT) Dear Mr. Oxxxxx: I-??m writing to express my distress at being disqualified for this expensive safety recall about which I was never notified by mail and, despite receiving maintenance and inspections at the dealership in slim 2-year period between the mailer and the expiration, was not notified of the recall. The phone agent, Ms. Xxxxxx, was very courteous, opened the case, and informed me of the 2018 mailing about the recall, which I did not receive. I-??m quite diligent about recall notices, we are a Toyota -??family-?? with a Sienna in addition to the 2010 Prius, and records will show we-??ve always attended to recalls for which we-??ve been notified, going all the way back to our first purchase of a new Camry in 1997. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Rutherford, NJ, USA

In August of 2024, my 2010 Prius with less than 100,000 miles - all the brake warning lights on the dash suddenly came on - without any prior warning. The brakes felt a little "funny" at the time, so I took it to my mechanic immediately because my safety or the safety of other was at risk if the brakes completely failed. My mechanic informed me that there was a TSB for the brake booster with master cylinder and brake booster pumps that Toyota new about. I felt that it was imperative that this was repaired immediately. Apparently Toyota knew about this issue but did not notify me in any way at any time. I bought this Prius new and have had regular service check ups. I had to pay nearly $5,000 to have this repaired which I feel that Toyota should reimburse me, and any others who had this problem.

- Texarkana, TX, USA

ABS and brake lights lit at around 141000 miles code C1391 came up during diagnosis.

- Hoover, AL, USA

Brakes started making a hissing sound a couple of weeks ago. Yesterday evening when I was driving on freeway, I got an assortment of lights on my dash while driving. ABS was instantly disabled and it was significantly harder to brake the car. BRAKE light on dashboard came on. Traction control light came on. It was very dangerous and it was mere luck that there was no car in the front - otherwise I could have crashed. Pulled over to the side on the freeway and then came in internal roads to my destination, keeping a lot of braking distance and at slow speed. Turns out this is the infamous brake booster leak that was so bad Toyota was forced to create an extended warranty program on Gen 3 to fix it. Brought it to dealer next day. Got an estimate for $4000 for "REPLACE BRAKE BOOSTER AND MASTER CYLINDER(DUE TO INTERNAL LEAK)"

- Santa Clara, CA, USA

Heading westbound on I-70, taking Exit 29 off ramp from highway, I drove over uneven pavement. My traction control, ABS and brake lights illuminated, the brakes suddenly felt mushy. As I approached the stoplight at the end of the exit ramp, I questioned whether I would be able to stop. Scared me immensely. Luckily no cars were near me. I now do not have ABS, Traction Control, stability control OR regenerative braking.

- Englewood, OH, USA