Toyota Prius grinding brakes problems

Filed Oct 8, 2025 · Brakes · CT

My Prius has a brake actuator defect that is common among 2013 Priuses. Supposedly Toyota mailed a notification of this problem, but did not do a recall. The notification offered to fix the problem, but you had to know that your Prius had the problem. I did not know. Once I understood that my Prius had this problem, the Toyota repair window had closed. The Prius is dangerous to drive. I approached Toyota and the dealer that sold me the car, and Toyota refused to authorize the repair and so the dealership refused to fix at their expense. I spent thousands on unnecessary brake replacement because the problem was never the brakes but the brake actuator, which is a KNOWN PROBLEM! Yes, the problem is able to be discerned upon request and I have taken video and you can hear the noise. This problem puts the driver, passengers and other vehicles at risk. There are no warnings or lights showing this problem, but the noise is loud, grinding and obvious.

Filed Sep 6, 2025 · Brakes · AL

when test driving the vehicle I asked about this buzzing/ whirring noise while sitting in the running but parked car. I was told these cars are hybrids, the electrical components make all sorts of whirring and humming noises and not to be concerned. Over the years I heard this noise, increasingly more and more, but I never knew it was something to pay attention to. Fast forward to July 2025. I noticed the car is inching forward while I’ve been stopped for a while at a red light almost like the brakes don’t want to hold. This has been happening so often that I have began to put the car in park while waiting for lights to turn green because it gets painful having to push the brake so far down. I take my car to a mechanic, explain all of the noises and the sensations and two mechanics Drive it but say it feels fine and there are no recalls. They say my front brake pads are low and that must be what I’m feeling. After replacing the brake pads nothing had changed. Now there is also a squeak while moving at a slow speed in stop and go traffic. 1 week later i bring it up while getting an oil change and ask if they know what it could be. They said brakes seemed fine. A couple weeks go by and yesterday while I was driving down the highway in heavy school traffic out of nowhere my car makes a clunk noise and all of these lights pop up on the dash. I roll the windows down and scream for my children to hold on because something was wrong. Luckily we were able to get to safety but I definitely had reduced breaking capabilities. I immediately take the car in and and find out my brake booster and accumulator has failed. service tech brings up the consumer program but my car is a 2013 and it is not eligible to be repaired bc it’s 10+ yrs. Even though Toyota admits to internal malfunctions of the Brake Booster Assembly, and my car is only at 76,000 mi it’s not being fixed. This is negligence on Toyotas part. Not fixing these faulty parts is endangering lives.

Filed Jul 4, 2025 · Brakes · IL · 1 injury

I started hearing a scratching/rubbing noise from the brake, and feeling the scratching/rubbing through the brake pedal, making it difficult to push down. I almost crashed in the ally into my garage, but the emergency braking took over and stopped the car very suddenly, snapping my neck a bit, and it is still sore as of me writing this report. Since then brake pedal makes scratching/dry rubbing noise with heavy rubbing and grabbing feel through pedal. It only happens at 20mph or below during quick stops (not smooth stop, press pedal quickly), at 15-25% pedal position. When holding pedal at that position while moving, rubbing/grabbing through the pedal feels rhythmic like it's related to wheel rotation. If car is creeping in Neutral or Drive (no gas pedal pressed), and you lightly press the pedal, you can hear and feel like something is grabbing/releasing/grabbing/releasing. Sometimes it the brake pedal resists and there is a very loud rubbing or grinding noise, and I have to press the pedal very hard. This can also be replicated when the car in in Park. Lightly pressing on the brake pedal causes the braking pump to make a whirring sound to build pressure (this is normal), but at the end there is a scratching sound and grinding feeling in the pedal. I took it to the dealer 3 days after purchasing it on June 25th, 2025 and the assistant service manager reproduced the issue in front of me, and thought it was the brake actuator going bad or something with ABS. However, the master tech at the dealer just drove it around, DID NOT CHECK ANY COMPONENTS except the thickness of the brake pads, and declared everything fine. I fear for my safety in this car. If I am involved in an accident, it will be because the braking system failed in this car and the dealer refused to fix it.

Filed Mar 6, 2025 · Brakes, Driver assistance · 106,019 miles · VA

The contact owns a 2012 Toyota Prius. The contact stated while driving 60 MPH, there was an abnormal grinding sound coming from the brakes while the brake pedal was depressed. The brakes, the traction control, and the ABS warning lights were illuminated. The vehicle was then taken to an independent mechanic where it was diagnosed with brake booster and master cylinder assembly failure. The vehicle was not repaired for the most recent failure. The local dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 106,019.

Filed Nov 6, 2024 · Brakes · VA

When the brake pedal is depressed, it occasionally emits a loud squeaking sound. I recently took the car to a nearby dealership (Ourisman Toyota in Chantilly, VA) for inspection, where the service advisor informed me that both the Brake Master Cylinder and the Hydraulic Brake Booster Pump require replacement. Here’s the detailed diagnosis: 1) Hydraulic Brake Booster Pump: The master cylinder/brake booster assembly is leaking pressure internally and requires replacement. 2) Updated Booster Pump: The updated part for the booster pump requires it to be replaced in tandem with the new master cylinder. The repair cost was estimated about $3,700.00 The advisor warned that if this brake component fails while driving, it could cause the brakes to lock up, posing a significant safety risk. Despite this being a well-known issue among 2010-2015 Prius owners, Toyota has yet to initiate an official recall for this part.

Filed Oct 15, 2024 · Brakes · OH

Loud grinding noise coming from engine compartment accompanied by a loud shrill alert. When attempting to pull over to a safe place, I put my foot on the brake pedal, but immediately became distressed because it felt like I had no brakes at all. After applying extreme pressure to the brake pedal, the car did begin to slow down, albeit very slowly. I had 2 passengers in the car (ages [XXX] and [XXX] ) and I felt their lives were in jeopardy. Upon researching, I found that Toyota has known about this ABS problem for quite awhile (at one point, they even extended the warranty on the faulty parts). With the gravity of losing the ability to brake while driving, reasonable people would conclude that a recall is in order. It does not matter if it is voluntary by Toyota or mandatory by the appropriate government entities. I, literally, feared for my life and the lives of my passengers. I am grateful it didn't happen while traveling at highway speeds because the outcome could have been much much worse. I sincerely hope that my government who is in charge of protecting it's citizens against known automobile dangers, will take the necessary steps to initiate a recall for all Toyota vehicles that have this serious ABS problem. My fear is that those decisions are made by algorithms and actuarial data rather than by reasonable common sense. I certainly hope there isn't an arbitrary number of deaths before a recall is made. What if one of your family died as a result of purposeful inaction. The diagnostic codes for my Toyota are C1256 and C1391. These both point to serious problems with the ABS system ( actuator, accumulater etc.). Please consider investigating this common and life threatening problem. Thank you INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 25, 2024 · Brakes · NC

I started noticing a strange noise when I applied the brakes. It was an electronic type of almost grinding sound. When I looked into it, it was determined that the brake actuator was failing despite no warning lights coming on. This started around the beginning of March. Finally in the beginning of July the noise stopped and a lot of dashboard lights came on including ABS, BRAKE, and others. This is when the brake actuator actually failed, and the battery no longer was charged when the brakes were applied. This is extremely concerning that a major brake component can fail like this and affect the safety of the vehicle. I am attaching a photo of the dash that shows the lights that came on when this failure occurred.

Filed Jul 9, 2024 · Electrical, Engine · AZ

During summer months when temperatures are above 100 degrees when accelerating from a complete stop I can hear the engine rev and the RPMs increase but the vehicle will move at 1-2 mph. Even if the accelerator is to the floor. After 3-4 seconds the tires will squeal and the vehicle will be jolted forward then it will slowly accelerate. This happens occasionally and I have taken it to a Toyota dealership and a chain mechanic shop, neither have been able to recreate the problem. There are no warnings and no error codes. I have been stuck in the middle of intersections trying to turn left, I have not been hit, but I fear it will happen. There is a recall out for this issue on other Priuses and I believe the issue needs to be investigated further as there is another complaint on this site for the same issue and I have found it on other sites. I bought the car in fall of 2019 and this problem has been occurring since summer of 2020.

Filed Jun 26, 2024 · Brakes, Electrical · 299,999 miles · MN

The contact owns a 2005 Toyota Prius. The contact stated that while driving at an undisclosed speed, the brakes seized. In addition, the contact heard a squealing sound and the ABS warning light illuminated. The contact used the parking brake to stop the vehicle. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not made aware of the failure. The contact stated that the odometer was inoperable and failed to display the correct mileage. The contact stated that the odometer was stuck on 299,999.

Filed May 10, 2024 · Wheels · MA

I had begun to notice a slight shimmy at highway speed for a few days, but it wasn't pronounced enough to cause concern, especially since the weather was very windy and already subjecting the car to heavy crosswinds. On Monday, [XXX], the shimmy became suddenly more pronounced, so I pulled off the highway ([XXX]) and parallel-parked on street in Cambridge, MA. While parking, I heard a loud creaking and grinding sound, and the car no longer responded to steering inputs. I exited the car and noticed the rear driver's side wheel protruding at a strange angle from the wheel well. I called AAA and the tow truck driver discovered that, behind the wheel, where the wheel meets the rear axle, the arm had rusted clean through. In other words, the wheel had completely fallen off, and was being held to the car only by the brake line. I was towed to a mechanic in Salem, MA. Both the Salem mechanic and the AAA tow truck driver said that they had never seen anything like this in all the years they'd been servicing cars. I told them that the car had never been in a flood or otherwise involved in the kind of extraordinary event that would cause more than typical rust exposure. Had the wheel come off at highway speed, I could have been seriously injured or killed. The issue did not seem to have been caused by driver/owner oversight or normal wear and tear. It seems highly unusual and potentially indicative of a defect or manufacturing error. I hope other 2010 Prius owners are aware of the vehicle's susceptibility to this issue. And I would like Toyota to take some responsibility for the high cost of repair. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)