ABS light came on. Diag code: C1391. Abnormal leak in accumulator. This problem is similar to a recall on Prius 2010 for ABS brake issue. However, Toyota said that my Prius is not part of the recall. I would like to request Toyota to fix this problem for my Prius 2010 so that I can safely drive this car.

- Gainesville, FL, USA

I change the brake booster twice and hace the same problem. My brake pedal loss of braking ability or slipping brakes and the warning brake, ABS and traction light permanently on, and no cruise control works at all

- Accokeek, MD, USA

Brakes turned to mush - pedal went all the way to the floor with almost zero stopping power. Sounds like a similar recall from 2013 or so. Going 45 mph (speed limit) on a busy 4 lane hghway approaching stoplight and slowing traffic for red light at intersection of another 4 lane road. Brakes mostly unresponsive. Almost went through intersection and narrowly missed hitting a slowing car. Braking did not engage per usual activation position and pedal went to the floor instead. Car was just serviced a week ago for unrelated recall item. Car has been maintained diligently since new purchase in 2009, getting all recalls serviced promptly. Maybe the range of vins in the older recall was not wide enough?

- Arlington Heights, IL, USA

When driving over bumpy or rough surfaces or pot holes, while applying the brakes, the brakes often seem to stop working. And the car seems to have a little boost forward. It happens wherever the road surface has bumpy areas on straightaways or curves. And mostly when applying light pressure to the break, like slowing for an upcoming turn. It has been happening since I got the car in 2013. I have taken it to a mechanic, but they couldn't find the problem. This has happened many times over last 3 1/2 years.

- Cincinnati, OH, USA

I am the original owner of a 2010 Prius. Within the first month, I contacted Toyota, complaining of the brakes, which were not consistently smooth. In general, the brakes work fine, but if I hit a bump or ditch, the brakes suddenly stop working for a split second, and the car feels like it is lurching forward, before the brakes suddenly start working again. Toyota service was never able to "reproduce" the problem, and eventually I gave up. A couple years ago, the car was recalled for this problem, and I brought the car in to be fixed. Unfortunately, the recall work has not remedied the problem. The brakes still seem to occasionally malfunction when the car drives over a rough patch. Toyota seems to believe the problem has been solved, but it has not be solved. There is no difference since the recall.

- San Diego, CA, USA

This afternoon, my wife was driving down a two lane, paved street at about 25 mph. The street has a slight decline and she began to apply the breaks to slow down slightly. Just a second or two later, she hit a small bump in the road and the car accelerated (while she had her foot on the break) for a fraction of a second. We didn't hear the sound of the engine revving. Thankfully, there were no other cars on the road at this time and there was time to press the break again. Based on looking around online, many people have reported similar issues (www.consumerreports.org/cro/news/2010/02/Toyota-adds-2010-Prius-braking-problem-to-the-list-recall-possible/index.htm).

- Richmond, VA, USA

When I am coming to a stop (braking normally) and hit a bump, the car surges slightly and the brakes become less responsive. It feels like I'm fighting the engine as it accelerates and I'm trying to brake against it. Releasing the brake and attempting again seems to be a solution, but I often don't have time before reaching the intersection I'm approaching. This consistently happens in two places in my daily commute with a slight buckle in the road approaching an intersection on city streets and county roads.

- Edmond, OK, USA

Driving down highway at posted speed limit (75mph), I tried to slow down due to traffic and noticed my cars ability to brake was severely compromised. I then noticed my cars brakes, ABS, master warning and vsc lights had came on. Given that my car has 103K miles on it, I figured it is time for a brake pad service. With the limited braking ability, I decided to make the short drive to the Toyota dealer for brake service. After the dealer inspected my car, a representative told me that it is not the brake pads that are causing the lights in your dash to go on but rather the brake booster. They advised me that it is not recommended that I drive the car anymore until the issue is remedied by replacing the brake booster at a cost of over 2K. I had to also incur the cost of a rental since the booster was not in stock and would take over the weekend to receive. I was taken aback by the total cost of the service but had no choice and proceed to get it repaired. Upon receiving my car a few days later, I drove to work and upon my return home, the issue repeated itself with all the lights on the dash lighting up and the cars braking ability was again compromised. Extremely irate, I drove directly to the dealer and upon inspecting the car they told me that it is now the accumulator that needs to be replaced. This time the dealer absorbed the cost of over 3K to replace it. I researched the internet for any known recalls and found the issue was being addressed by Toyota with a recall however my cars VIN was not part of it. It is my hopes that you make Toyota aware of the safety issue and initiate a recall on all 2010 Prius models and not just some. I would also like to get the cost I incurred with this safety issue reimbursed at some point.

- Laredo, TX, USA

ABS actuator with master cylinder assembly has internal leak. Assembly doesn't hold pressure and actuator motor continiously working in order to create the pressure. Due to this problem brakes are not operate as properly. It takes more strength to put on the pedal to stop vehicle. I also noticed that during emergency braking not all wheels were involved equally. Due to this problem braking distance significantly increased. I have 3 instrument cluster error lights turned on due to this problem: "brake", light with vehicle on sleepy road, and light with "!" sign. I found that there already was recall for same 2010 year Toyota Prius under tms-ntc-13178 of July 23, 2013, Toyota recall name D0H, but my vehicle is not covered. I kindly ask you to investigate if my car eligible to participate in this recall campaign, since seemsthat this car were assembled with same unreliable parts.

- Surfside Beach, SC, USA

The brake actuator failed on our 2010 Prius III manufactured in October 2010. Toyota is covering problems with this same brake actuator for 2010 Prius manufactured between March 2009 and early October 2009. My VIN did not fall into that date range even though mine was manufactured in October 2009, so the brake defect should be extended to beyond the early October 2009 manufactured date. The symptoms to this problem were the brake, ABS and traction control warning lights came on, no regenerative braking and the braking distance increased.

- Mililani, HI, USA

The contact owns a 2010 Toyota Prius. While driving 20 mph, the braked pedal was depressed and failed to operate as intended. The contact stated that several warning indicators illuminated. The vehicle was towed to an independent mechanic to be diagnosed. The contact was informed that the brake booster pump failed and needed to be replaced. The vehicle was not repaired. The vehicle was not included in NHTSA campaign number: 13V235000 (service brakes). The manufacturer was notified of the failure. The approximate failure mileage was 100,000.

- Syosset, NY, USA

The brake booster pump assembly failed, which left me with no brakes and in a life-threatening situation. The vehicle was in motion and I narrowly avoided a bad accident on a city street.

- Syosset, NY, USA

ABS + breaks + tcs lights are on and my car's breaks are not working it was about to hit with next car but my speed was under 30 that's why I reached safely. I showed it to just break and they said it's required ECU update. It's a software problem in this model. I don't know how to update software. Is it possible if I get free update from Toyota dealership ?

- Houston, TX, USA

The contacts owns a 2010 Toyota Prius. The contact stated that the brakes traveled to the floor when the brake pedal was depressed and the vehicle did not decelerate normally. The dealer diagnosed that the actuator system needed to be replaced. The vehicle was not repaired. The manufacturer was notified. The failure mileage was 92,514.

- Thrall, TX, USA

My wife was driving on the highway when her brakes totally failed. She applied brake pressure as hard as she could, but it had not effect. Fortunately, since she was in the left lane of the interstate highway, she was able to coast to a stop in the left hand shoulder. Several red lights lit up on the dashboard, including the brake and ABS lights. I had the car towed to world Toyota dealership in atlanta. They said the brake master cylinder failed. I paid them to fix it. See attached work order from world Toyota.

- Atlanta, GA, USA

The contact owns a 2010 Toyota Prius. The contact stated that the brake pedal was applied several times and there was an abnormal noise and vibration. The vehicle failed to come to a complete stop. The contact had to apply force to the brake pedal, but the failure continued. The dealer was notified several times, but was unable to replicate and diagnose the failure. The manufacturer was notified. The VIN and failure mileage were not available.

- Rancho Palos Verdes, CA, USA

I applied brake on a red light which is as usual for me and I noticed car didn't slow down and kept moving past the red light. It has happened before and the it happens on uneven and even on minor potholes. The brakes on the small bumps and minor uneven roads completely loose traction of the tires and car even faster with the brakes on when trying to stop over minor uneven roads. Mechanic said it's oversensitive anti locking brakes that cut off the brake power even when it detects minor disturbance in the sensors.

- College Point, NY, USA

I have a 2010 Toyota Prius. When trying to slow down, any time a bump is hit, (or a pothole) the braking power significant decreases. This greatly increases the stopping distance and is very scary in traffic and in winter driving. Is this a problem? I called Toyota earlier for the same issue and they told me that this is normal and this occurs because only one tire is hitting the pothole or bump' it is very scary and I have to leave a lot of space ahead of my car.

- Shelby Twp, MI, USA

Hello. I recently started to experience an issue with my vehicle. My brakes started to make some kind of unusual noises every time I press on them. I've never had that before and I service my car pretty often. I went to authorized Toyota dealership and they told me there was a computer issue and they fixed it for $110. It continued to make noises and all of the sudden it began showing ABS/brake/vsc lights on my car dashboard either while I was driving or being in the 'park' mode. At the same time my brakes stopped working well while driving when the ABS/brake/vsc lights were on. I checked the code of the error through the car computer and it showed me 'C1391'. I went to the dealership again and they did another check and this time they found that brake master cylinder/booster/ABS assembly needs to be replaced with $3,170 price. I attached here the paper that my Toyota prime dealership located here in saco, me gave me. I've been reading a lot about it online and people with the same type of hybrid vehicles have experienced it. I think Toyota needs to look into the issue and acknowledge that it is a common problem in their hybrid vehicles. I service my car all the time, I do oil change and check all the systems very thoroughly, so I don't understand why we, consumers, have to pay that big of a price for the car repair. I hope you can look into the issue and help me (and to all other car owners) to resolve this kind of issue. Thank you.

- Saco, ME, USA

I recently purchased a Toyota 2010 Prius and four dash warning lights appeared the day after I purchased it when I turned the car on in the morning. The lights stay on for hours to days and go off for similar amount of time. When the lights are on the brakes are much less responsive and the braking action does not charge the batteries as much, never more than 25% of charging potential. The problem was diagnosed as a problem with accumulator in the brake system. I performed a search online and found that there is a recall for such problem, but my vehicle was produced a month after the date of production that would qualify for this recall. I will a pdf copy of the recall I'm referring to.

- Gainesville, FL, USA