Traction Control Warning Light and ABS!! Warning Light and Brake Warning Light are remaining on in my dashboard when I am driving, then my Brake changes to hard to press that is abnormal. Mechanic told me my car-??s error code relate with this issue is -??C1391-Leakage in accumulator abnormal-??, so it is related with -??ABS Module-?? and -??ABS Accumulator Pump-??

- Manhasset, NY, USA

I was parking my car inside the garage, when suddenly feel like it was skidding, and I thought it was going to hit the wall. Then I saw the ABS, brake skid control, and brakes lights. After that incident the car feels like loosing half of its breaking power, the regenerative breaking was not longer working. I could hear a noise related to the break pressure pump every 4 seconds when normally it was longer. I connected the computer to look for codes and found the C1391 "Break Accumulator leak". Having this abnormal frequent pump running will wear it more up to the point that it would not pump any more leading to a catastrophic failure with lack of braking. Investigating about this issue it looks not isolated with several people reporting the same issue, even there was a recall but just up to 2010 models, but the problem is more spread since I am also experiencing exactly the same issue.

- Pharr, TX, USA

I had taken the Prius in to my local Toyota dealer to get the brakes flushed and bled due to thinking there was air in the brake system. I thought this because I had noticed over the past few months that the brake actuator was pressurizing at a slowly increasing rate, which I had assumed meant there was air present. I had taken the Prius in to Toyota for multiple oil changes and was never informed of any stored ABS codes or even of the Technical Service Bulletin for the actuator and master cylinder malfunctioning in Prius-?? of the same years. Had I had known about the TSB, or informed of the abnormal behavior of the brakes being more than just air in the system, the repairs would have been performed free of charge under the TSB guidelines. The Prius is now out of the mileage requirements of the TSB as I use my care for work but have been experiencing this since before the mileage was over the TSB limit. After the brake flush and bleed was performed, the ABS light, BRAKE light and traction control light all illuminated and I had lost power brakes while driving. I managed to park safely due to the roads not being busy and checked the brake fluid reservoir. It was grossly overfilled. I took the car back to Toyota thinking this was the issue. When the technician received the vehicle, the lights had gone but the code for the master cylinder malfunctioning was stored. The Service Assistant informed me there was a TSB for this exact issue and was the actual cause for the actuator behavior I had been experiencing. They completed another flush and bleed and sent me on my way. He told me if the lights come back on, to bring it back to carry out the $3300 repair. The problem is, I heavily rely on my vehicle for work and if the lights come on, I experience complete loss of power brakes and might not be lucky enough to be on an empty road. This is a massive safety concern for my family and me. I am appalled that this was the conclusion I was left with.

- Albuquerque, NM, USA

My traction control, ABS, and emergency brake lights have been on for two weeks. I took my car to a mechanic and learned the power brake booster and master power assembly are defective. It is available for inspection upon request. Due to this part malfunction, I am unsure whether I am able to drive my car safely due to multiple brake concerns. This problem has been reproduced/confirmed as there is a national backorder on this kind of part. Due to the national backorder, I must drive my car in an unsafe manner. I have only had my car inspected by an independent mechanic called Certified Automotive, who have impressive reviews and credentials when it comes to inspecting car braking systems. To my knowledge, this is not a part of normal wear and tear on a Prius vehicle. This will now put the onus on me to purchase an expensive new part due to the defectiveness on Toyota's part.

- Salt Lake City, UT, USA

To whom may be concerned, My car started to have the issue from the beginning of this year, the braking booster keeps restarting every 8 to 10 sec, and I need step on the brake paddle harder than before to stop the car. I brought my car to local dealer last month, they admit they can hear and see the issue, but TOYOTA gave them the guideline is the code must be on. So that means no matter how bad the braking system, as long as the code not show, they won't take any action. So far TOYOTA only recall some specific model, but more cars with the bad braking system are outside, it's dangerous for everyone, I have to drive slowly and carefully to make sure I can stop the car when I need, even like that I still feel unsafe for me, since I feel harder and harder to stop it. So can anyone help to push TOYOTA to face their issue and take action ASAP before more and more accident happens. Thanks a lot Your Sincerely ZHENCHI

- Fontana, CA, USA

The brake booster on my car has stopped working causing my car to be unsafe and expensive to repair. This seems to be a common issue with prius-??s which is not fair to the owners.

- Palm Bay, FL, USA

brake booster and brake actuator internal leaks the brake pedal goes to the floor with firm press when trying to stop the car yes, the problem has been reported to two toyota dealership and report to toyota brand engagement multiple times yes, vehicle was inspect by toyota dealship and independent service center yes, the following (traction control lamp, brake lamp and ABS lamp) warn lamp was and still is

- Foothill Ranch, CA, USA

Driving down the road and the brake light, ABS light, VSC light and a ! with a circle around turned on in the dash. My breaks almost stopped working I almost hit the car in front of me. I've been try to figure out what's wrong and keep hearing this is a brake booster/ actuator problem. I have parked the car due to the brakes barley working.

- Maryville, TN, USA

break booster systems fails in the ABS system, causing warning lights to come on intermittently and the breaks to not work properly. this is a known issue by Toyota that affects numerous priuses was well a large group of camry's. The company issued a Customer Service Program to address the issue but did not make extensive efforts to warn vehicle owners that this is a known problem. The fact that this issue of leaking oil in the break booster assembly is considered serious by the company and the urge you to get it repaired immediately if you become aware of it. this seems like something that should rise to the level of a product recall, not a voluntary program by Toyota. I have the documentation of from Toyota on this issue if you need it.

- Appleton, WI, USA

vehicle brakes fails to stop and needs to push hard on brake paddle to stop the vehicle. traction control light, ABS, and Brake lights come on. took to autonation Toyota irvine in dec. 2020 reporting the issue but the tech clear the codes and told me that nothing is wrong. the same light came back on and took to 3rd party shop and was informed code C1391, C1345 & C1368 reporting issue of a failed booster and booster pump. customer support program ZJD. I've been in contact with toyota brand engagement to report the issue and regarding automation Toyota Irvine clearing the codes after I took my vehicle to the shop for repairs. but dealer is not repairing the vehicle and the vehicle has been in the dealer shop since jan 10, 2021. REPORTING A ISSUE WITH BRAKE FAILURE ON MY 2013 TOYTOA PRIUS.

- Foothill Ranch, CA, USA

The contact owns a 2013 Toyota Prius. The contact stated that while driving at 25 MPH, the brake pedal was depressed but failed to respond and went all the way to the floorboard. The traction control warning light, ABS warning light, the brake warning light, and an unknown warning light illuminated. The contact stated that she continued to depress the brake pedal until it responded. The vehicle was taken to the dealer who diagnosed that the brake actuator needed to be replaced. The contact stated that the failure had been recurring while driving. The manufacturer was notified of the failure and informed the contact that they could not assist as her vehicle was 5,000 miles over the mileage for the extended warranty. The vehicle was not repaired. The failure mileage was approximately 155,000.

- Douglasville, GA, USA

Hi, I have been having trouble with my car for the past few days. It is getting C1391 Diagnostic trouble Code. I have been busy with work and had to take the car to work. It has around 151,000 Milage now. I called Toyota regarding this problem and was told that my car don't qualify for Customers Support Program as it has more than 150,000 miles. I checked this website, and came know about extension till 31 August 2021 and unlimited mileage. My car starting showing up the code few days back, although I could notice chirping sound while applying brakes for past 2 years. I didn't know it was an issue. Fred Haas Toyota Country, 22435 TX-249, Houston, TX 77070 quoted around $2600 to replace the brake booster and pump. Can you please look in the matter?

- Houston, TX, USA

The contact owns a 2013 Toyota Prius. The contact stated that when he started the vehicle and depressed the brake pedal, the vehicle made abnormal whirring sounds. There were no warning lights illuminated. The dealer was not notified of the failure. The manufacturer was notified of the failure and advised the contact that they would not cover the repair of the vehicle. The contact stated that the failure had been reoccurring. The vehicle was not diagnosed or repaired. The approximate failure mileage was 116,000.

- Santa Monica, CA, USA

Failure of the ABS accumulator caused an accident that could have easily killed my family. The issue makes all ABS and stability control inoperable. While applying the brakes to avoid a deer at highway speeds, the wheels locked up while sending the car in an uncontrollable sideways slide across the highway and into a culvert. My wife was driving at the time and she had our 2 small children with her. I learned about the problem from the Toyota dealer and the service advisor told me that Toyota knows about this problem. The advisor informed me that it-??s simply just a TSB. This is highly dangerous and Toyota should be responsible for this faulty system.

- Lakehills, TX, USA

Brakes were applied in order to avoid a collision with a deer, but the brakes locked up, sending my family out of control across the oncoming lane and into an embankment. They were lucky they weren-??t killed. Toyota knows this is an issue and have failed to address it. The ABS accumulator no longer works, causing a dangerous situation. A local Toyota dealer alerted me to this issue.

- Lakehills, TX, USA

While driving vehicle the parking brake light, abs light and traction control lights all suddenly came on. I was driving on smooth roadway with no bumps. I pulled to side to investigate to found that I had to press really hard to get brakes to function and stop the vehicle. Luckíly there were no other vehicles around.

- Palm Coast, FL, USA

For about a week, I heard intermittent strange noises when I would be stopped in traffic with the brake pedal depressed. On 08/31/21, lights on the dashboard came on - the "brake" light, "Brake system warning light", ABS light, and the "Slip indicator" light. All of these remain on. Braking was feeling sluggish and the brake pedal would decompress to the floor when starting the car. When starting the car on 09/01/21, the car lurched forward although in "park" mode. I drove the car to the lube specialist to have them check the fluid levels, and they said that everything was o.k, nothing to make all the warning lights light up. Then I was referred to a mechanic who works on Pruis cars. His diagnostic tool was indicating that my brake accumulator was bad. This has led me to check for recalls on this model and year and it seems there have been problems submitted on this very issue.

- Titusville, FL, USA

The contact owns a 2013 Toyota Prius. The contact stated that while driving at various speeds, the vehicle would shake and vibrate while depressing the brake pedal. Additionally, while depressing the brake pedal, the vehicle would not immediately stop, causing the braking distance to become extended. The vehicle was taken to the local dealer who replaced the brake pads, but the failure persisted. The manufacturer was notified of the failure. The approximate failure mileage was 108,000.

- Auburn, CA, USA

I cannot stop my car in time, it feels like I am fred flinstone trying to use my feet to stop. I have rear-ended another car. I have no car to drive as it is not safe. Kendall West Toyota gave me car back and said part of recalls completed but unable to complete other recalls. They said ABS fixed but it is not as still makes the same whining sound and I cannot brake. I have to use all my strength to push as hard as humanly possible. I have to pay for rental car. Kendall Toyota could not provide a time frame of when my car would be fixed.

- Miami, FL, USA

My 2013 Prius is having issues with the interface and it has been recalled and I don't know what to do from here.

- Kissimmee, FL, USA