I’m encountering multiple dash lights with the brakes being very unreliable and no that’s no regenerative breaking. I checked with an obd2 kit and the app shows that I have a code C1391.
2010 Toyota Prius brakes complaints
Page 4 of 66: complaints 71 to 100 of 1,945, newest first, as owners wrote them.
Faulty brake boosters that crack and leak, making brakes unusable and draining the battery (diagnostic code C1391). There was a Toyota service repair where they exchanged the faulty brake boosters with properly working ones, but it has lapsed.
The contact owns a 2010 Toyota Prius. The contact stated that while driving at an undisclosed speed and attempting to slow the vehicle, he became aware that the brake pedal required excessive force to bring the vehicle to a complete stop. The service brake warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the brake booster and brake master cylinder. The vehicle was not repaired. The vehicle was then taken to an independent mechanic, who confirmed the diagnosis and additionally found that there was a leak in the brake fluid accumulator, resulting in low brake fluid pressure. The vehicle was taken back to the dealer, who added brake fluid to the braking system, which seemed to temporarily resolve the failure. The manufacturer was not notified of the failure. The failure mileage was 140,000.
[XXX] We took in 2010 Prius to Toyota Dealership in Pharr Texas because road hazard light, ABS , Brake and low tire alarm came on while driving car. They ran diagnostic and found out that the brake pump assembly and brake cylinder assembly has to be replaced. We called Toyota Cooperate to ask for assistance to pay for cost and after 4 weeks of reviewing issue they said they could not help us because the CSP had expired. This car was given to us by a friend of ours and they had not used it for 2-3 years so we got it we repaired and got car running again. After we drove it we came across this problem with the brakes. This car was was built in the same plant as the other recalled cars going by by the vehicle number . We believe that the CSP should be extended or changed to a Recall? Will you help us or direct us to whom we can contact with this safety issue? I have the Toyota diagnostic report from Toyota and Toyota Corporate Letter on email. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
My 2010 Toyota Prius hatchback suddenly had 4 or 5 warning lights appear on the dashboard and my brakes failed to function properly. It felt like the power brakes was turned off ! Although I did get the vehicle stopped, it surely was a dangerous situation. I understand that Toyota knows about this problem, and have read that it was warranted if this happened before 150,000 miles. My Prius has approx 167,000 miles right now and to replace the Brake Actuator, the cost will be $ 3 - 5 thousand dollars…absurd amount in my opinion. Since this critical feature (brakes) has a long known history of being faulty on Toyota vehicles it should be warranted for at least 25 years and at least 300k ! My Prius is “unsafe to drive” and is nothing more than a paperweight…I repeat, Toyota knows, and has known about this defective brake actuator problem for years and years!!! Please lean on Toyota to up the warranty of this faulty brake problem for the MANY, MANY Toyota owners who have purchased the Toyota product and and NOT screwing the public like they are doing now !
A warranty extension went out a few years back that said one might receive a "CHECK PCS SYSTEM" warning on the dash. This has happened to us, along with 7 other lights on the dash. Between the brakes being much less responsive, and all of the pre-crash warning / adaptive cruise / radar features being disabled, this could have caused an accident. The dealer checked out the car and states that the brake actuator has a leak and that it will be a costly repair - no less than $3000. This suspiciously all happened *just* outside of the warranty window (we are within the allowed number of miles but just out of time), and also suspiciously after Toyota released an upgraded version of the actuator, and *also* after a bunch of people are experiencing the same failure. Our best assessment at this time is that the brake actuators have a factory defect and that a recall should be done.
The brake accumulator has failed on my prius which then deactivates regenerative braking, traction control, abs, and stability control. The lights for traction control, ABS, and stability control and parking brake are shown on the dash. The result for the driver is that the brake pedal has the same pressure, but does nothing until about 25% of pedal travel. At this point, the mechanical brakes will engage and provide a very sudden and jerky application to the brakes. In other words, a very non-linear brake control is present and is incredibly difficult to predict. If this vehicle is operated on the motorway, the safety of the vehicle's occupants as well as others on the road is greatly reduced. Street Toyota has confirmed this issue and its effects. They want to charge $3600 to fix this issue even though the car is only worth $5k. This problem has been investigated in the past buy Toyota and the federal safety agency. Toyota has applied an extended warranty for this part meaning that they will only replace it once it goes out. They also failed to notify their consumers about this matter. It is a serious issue that has put many lives at risk and has caused multiple injuries. It is a matter that should not be ignored by either the federal safety agency or Toyota.
I noticed that the ratcheting parking brake pedal has stopped ratcheting correctly, and I planned to have it inspected on the next scheduled maintenance. Recently, the brake system illuminated the traction control, ALB and "BRAKE" lights simultaneously, and the braking power diminished by more than half, with no braking until the pedal was halfway down. I depressed the parking brake pedal a few times, which cleared the "BRAKE" symbol and the problem stopped and normal braking returned. This has now happened three times with the same fix. It appears that when the "BRAKE" symbol is no longer illuminated, the problem goes away. This appears to be a software problem that triggers a braking problem to engage the traction control and ABS icons when the "BRAKE" icon associated with the parking brake is illuminated. This web site has other instances reported with the same symptoms, and Toyota had a service bulletin, which has expired, which leads to a $2000-$3000 repair bill to replace a brake booster. It appears to be software related to me, not mechanical. It poses a safety risk because braking performance is severely compromised with no warning. NHTSB needs to look into this, as rear end accidents can easily happen if strong braking in heavy traffic is required to avoid a collision. I recommend that a recall be established to fix this. An alternative cause may be a misaligned micro switch in the parking brake mechanism, which has been experiencing problems. This could lead to the "BRAKE" light being illuminated, and sending a bad signal to the computer.
Video recording
I was in my 2010 Toyota Prius with my two children when I suddenly lost my brakes, with luck I was able to let off my gas and coast to a stop. Now I am left with a 3,000 dollar repair. I now know what the price of my children and my life is worth to Toyota! To find that this has already been a problem with no notification is ludicrous!
The contact owns a 2010 Toyota Prius. The contact stated that while driving 50-55 MPH, the ABS, traction control, and brake warning lights illuminated. The contact called the local dealer, but the vehicle was not diagnosed or repaired. The vehicle was taken to an independent mechanic and the contact was informed that the brake booster assembly needed to be replaced. The manufacturer was contacted, but no assistance was provided. The approximate failure mileage was 139,999.
All the lights on my dash board came on suddenly, and the brake emergency, traction control and ABS lights stayed illuminated. Upon exiting the interstate I could not come to a complete stop at the end of the exit, which was very scary. Fortunately the cars driving on the road the exit merges into did, so we avoided a terrible accident. The brakes were spongy and not operating properly after that. The next day with all the lights still on, I slowly drove (20 mph) to the local Toyota Dealer , who claimed that error code (C1391) was being displayed and according to Toyota, that means the Booster is or will be leaking. Therefore the Pump and Booster needs to be replaced (estimated at $3K). No lights or errors were given before the incident, the brakes just suddenly malfunctioned. However Toyota apparently is aware that the booster and pumps fail without warning, because I discovered with an on-line search that code had a "customer extension" warranty (by googling the code C1391), I called customer service but they refuse to help. They claimed I was mailed a letter in October 2018 (they didn't offer to supply a copy.) However, I never received a letter or any notice from Toyota or the Toyota dealer that I have repeatedly used since I bought the car in 2010 (I have had brakes replaced there when it was under 150k and no one said anything!) Now they are stating that the extension has expired as it was only good up to 150,000 miles or 10 years which ever came first. I can't understand why they have a known brake issue and not replace the part when the vehicle is already at the dealer (It's there for every oil change 3 x a year!) Brakes are an important part of a vehicle, a failure like this should have been recalled, and Toyota should have been made to replace the faulty parts!
The contact owns a 2010 Toyota Prius. The contact stated that while driving at an undisclosed speed, the contact depressed the brake pedal and noticed an abnormal humming sound. The contact stated that the failure had been intermittent since 2016. The contact stated that the failure had become persistent. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure but did not assist. The failure mileage was approximately 296,842. The VIN was unavailable.
Recently, I had ABS failure in my vehicle and warning lights came up on my dash with code C1391 which indicates a problem with brake booster assembly and pump. Now I am afraid to drive it because the brakes seem that they could fail at any time and I cannot break quickly when needed. Toyota is aware there is a problem with the brake booster assembly and pump based on prior Customer Support Programs (my vehicle was not included since warning lights were not present at the time), class action lawsuits, and petitions to NHTS about this issue. I believe the problem is prevalent enough and brakes are significant for driver safety that there should be a safety recall. My vehicle has less than 150,000 miles. I called Toyota to complain about the problem as I know it is very common among Prius owners, but they have said there is nothing they can do.
The contact owns a 2010 Toyota Prius. The contact stated that while driving at an undisclosed speed, the ABS and brake warning lights remained illuminated, and the brake pedal was firm while depressed. The contact stated that the vehicle failed to immediately stop while depressing the brake pedal, causing the stopping distance to be extended. The cause of the failure was not yet determined. The manufacturer and local dealer were not notified of the failure. The failure mileage was 120,000.
The contact owns a 2010 Toyota Prius. The contact stated that while driving at an undisclosed speed, the traction and ABS warning lights illuminated. The contact stated that the brakes were inoperable. The contact stated that he was driving at a low speed and was able to safely stop the vehicle. The vehicle was taken to an independent mechanic where it was diagnosed with a failed brake booster. The contact was informed that the brake booster needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure but did not assist. The failure mileage was approximately 227,000.
While operating the vehicle at normal highway speeds, the car suddenly had the ABS, Traction Control, and Brake lights all come on. The vehicle did not operate or sound any differently at the moment all the lights came on. However, over the next week there developed a mild humming coming from somewhere in the engine bay approximately behind the dashboard. My mechanic identified the problem as the brake booster and pump assembly failing and informed me that the vehicle may drive normally for sometime but the brakes will fail suddenly once the brake booster and pump fully fail. Thus, making operating the vehicle extremely dangerous. I am currently waiting for a Toyota specialty mechanic to become available to replace the brake booster and pump assembly at a cost of +$3,000. Please investigate this issue, there are many people experiencing this issue with the 2010 Prius models.
The contact owns a 2010 Toyota Prius. The contact stated that while driving at 40 MPH, the vehicle consistently made abnormal sounds and jerked forward while the brake pedal was being depressed. The vehicle became inoperable. Several unknown warning lights were illuminated. The vehicle was taken to the dealer to be diagnosed. The contact was informed that the failure was due to a crack and leak in the brake booster. The vehicle had not been repaired. The contact referenced the federal safety agency Campaign Number: 13V235000 (Service Brakes). The manufacturer was made aware of the failure and determined that the vehicle was no longer under warranty. The failure mileage was approximately 65,000. The contact stated this is a known manufacturing fail for the brake booster 2010 Prius.
My brakes behave strangely cause i experience inconsistent brake feel after actuation during slow and steady application after brakes on rough or slick surfaces.also, All three lights ABS light,brake light and VSC come on and off on dashboard at the same time.
A couple weeks ago we were driving our 2010 Toyota Prius and 3 brake lights came on: BRAKE, ABS, and a car with squiggly lines behind it. We took the car into the Toyota dealership ($209) to perform a diagnostic. Their results are as follows and I quote: "Hydraulic Brake Booster Pump DTC C1391 Abnormal leak in accumulator. Has T-SB and CSP that are both expired. Recommend perform repair outlined. Recommend R&R Brake Actuator Assy, Booster Pump Assy and perform ABS ECU Reflash. We wouldn't have purchased this car had we known a few years later we'd be facing a $4400 charge Toyota wants to charge. We don't have the funds let alone go now and purchase another car.
Slip indicator symbol, Brake word, Brake symbol, and ABS word lit up while driving. Brake pedal had to be pushed further down to stop the car. No warning lights or issues before this incident. Toyota diagnosed as abnormal leak in accumulator and internal brake fluid leak, and quoted replacement of the brake booster assembly with master cylinder and the brake booster pump. There is no advance indication and the brake booster will not be available while driving. Toyota recalled selected vehicles. There are currently many reports online from vehicles excluded from the recall that are affected by the same brake booster malfunction and warning lights.
The brake booster assembly and brake booster pump have failed due to a vaccine leak internally in the brake booster. Failure of the brake booster can cause the vehicle to be more difficult to stop. Yes the failure codes have been reproduced. The vehicle falls “out of warranty” for a part that should last the life of the vehicle. Replacement of the part is quoted over 4,000 dollars. The abs light, brake light, and traction control lights.
Hi I want submit issues with the master cylinder and abs pump assy I have 2 vehicles same model with average same mileage and both had issues with this system if I drove any distance below 25 mph in a constant time the dash lights comes on traction control, abs light, brake light , and the brake pedal goes low and barely brakes make this situation dangerous when I stop if you try turn it off the engine and on again lights stay there but if I reset the codes the pump works again for some while and then again when you don’t expected lose pressure and I am really afraid for my safety and my family, and I am not the only one with this problem is too many Prius owners who have the issues I went from dealer and they advice $3000 dlls fix situation who motivate people to lose money for $1200 in parts and $1800 dlls in labor for something they can resolve it because in reality is an manufactured defect
The contact owns a 2010 Toyota Prius. The contact stated while driving at various speeds and depressing the brake pedal, the brake pedal was firm and difficult to depress. The contact stated that that the brake pedal was pumped to stop the vehicle. The contact stated that the ABS and stabili-trak warning lights were illuminated and an “Exclamation Mark" message was displayed. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the brake master cylinder and brake booster pump needed to be replaced. The vehicle had not been repaired. The contact researched online and related the failure to the federal safety agency Campaign Number: 10V039000 (Service Brakes, Air). The manufacturer had not been informed of the failure. The failure mileage was approximately 138,000.
The breaking lights, skid lights and another light associated with breaks came out and I lost the ABS abilities, the hv battery is not charging while breaking. These lights comes out randomly. Very risky especially while breaking.
Due to insufficient corrosion protection, the rear brake line of my 2010 Prius burst as I pressed the brake pedal in my driveway. It dumped ALL of the brake fluid onto the ground within a couple of minutes. Imagine if I had been driving!! There could have been a serious crash!! This was sudden. There were no brakes! Pedal lost all pressure and went to the floor when pressed. Lots of warning lights and alarms screaming inside car. The vehicle has been inspected and repaired at the Toyota dealer as of 10/03/2023. I have pictures of the failed part when it was installed on the car. If the dealer is contacted quickly, they might still have the actual failed brake line (which I was charged disposal fees for.) This was very scary and numerous lives could be at risk due to the popularity of this car and its use in rideshare/taxi service. There were no warnings prior to this. Brakes worked normally. Car is well maintained with dealer service records. There is no excuse for not properly trading such a critical part for corrosion, just to save money. Peoples lives are at stake!! It's the BRAKES of the car!! Someone needs to investigate this! I have pictures and receipts I can provide.
I was driving and all of the sudden lights came on, on the dashboard and when I started to slow down, I noticed the brakes were very "mushy" and barley worked. I then drove it directly to the dealership and on the way the lights went off, and brakes went back to normal. This is a very dangerous situation for anyone to be in and I don't know why the federal safety agency has not made this a mandatory recall for Toyota, I did find a recall # 13V235000 (which needs to be extended). The dealership said it would cost $3,000 to replace the Brake Booster Pump Assembly and Master Cylinder. This type of repair should be recalled, and the federal safety agency should get this resolved with Toyota ASAP.
Affected by the recall number 10V036000, the 2010 toyota prius is manufactured with a defective brake booster and master cylinder system which causes defect of the brake system, and causes my vehicle to often lose power in abs and randomly lose abs power braking, making brakes hard, and makes for longer stopping distance. This is a problem for many and obvious reasons on the road regarding safety. All vehicles should have optimal braking systems for the road, and should otherwise be repaired at no cost if the car is manufactured with defect. This has caused no accident for me yet but the abs has failed on many occasions. I have read at least 100 cases of this given vehicle under this recall being caused an accident with faulty brakes, and sometimes complete failure to stop which is extremely worrying. This recall excludes vin numbers past a certain date, yet the recall in question is certainly still affecting many cars, as capistrano toyota has also called for petition of toyota to repair at no cost for all affected vehicles. Yet all dealerships have denied my request and toyota has no formal coverage regarding the rest of the faulty vehicles they manufactured.
Known problem for Prius with limited manufacturer liability. My breaks started failing, I am being quoted at $4000 in repairs and labor. My car is 3 years older than the recall parameters but within mileage. Manufacturer won’t cover anymore since it’s past due
Hello on my 2010 Prius the ABS, Brake, Traction Control lights are all on lit up on my dashboard. Brakes are making loud noise when I stop the vehicle. I took the car into my local dealership service department. I’m being told that the brake booster and master cylinder needs to be repaired. This was a part that was put under an extended warranty with Toyota but now it’s no longer being covered by the warranty. So they want me to pay out of pocket to fix. I would like to report that they should honor the warranty agreement for my vehicle.
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