2013 Toyota Prius

Lost brakes on the freeway. Managed to pull over and get the car to a mechanic. He diagnose d the problem as the brake actuator pump.We then took the car to a Toyota dealership that confirmed the Diagnosis. I understand that the NHTSA is revisiting a complaint about the failure of this part. It cost me $3600 to have it repaired. I personally believe that Toyota should cover this as they have known the part was a problem.

Problem 1. Both curtain airbags on the passenger side deployed while no one was sitting in those seats, no injuries sustained to anyone. This happened one time as it happened in a car accident, nothing indicated that the air bags were on or active at the moment. Problem 2. ABS system failure has caused the brakes on the prius to lock and not work while driving, almost causing an incident. The car has not been driven since for the fear of that happening again. The vehicle has been seen by a mechanic to determine it is the abs system. The ABS light has been on as well, it appeared a couple of weeks before the brakes locked up back in March of this year.

Took vehicle for state inspection on 2/13/2024, failed inspection because of brake warning lights. Slip indicator, Electronically controlled brake warning light, Brake warning light, Anti-lock brake system, and Low tire pressure lights are all on. I have looked into it, and it seems the brake actuator/booster used to be under warranty, however since this is a 2013 in 2024 with almost 210k miles on it, it no longer qualifies for the original recall.

I was driving my 2013 Toyota Prius last week when my my dashboard lit up with the Brake, ABS, and Traction Control lights all going on simultaneously. Shortly thereafter, I attempted to brake, as a car stopped in my lane to make a left hand turn, and the brakes did not engage as they should. I had to press twice as hard for very limited braking; my braking distance increased substantially and I narrowly avoided hitting the turning car in front of me. I drove it directly to the dealership and they diagnosed it as a failure of the Brake Master Cylinder Assembly and Brake Booster Pump Assembly (code C1391). Upon further research, I found that Toyota had previously acknowledged the problem and issued a warranty extension (Customer Support Program ZJB) that covered up to 150,000 miles or 10 years. While my Prius is well below the mileage requirement, I am beyond the 10 year limitation by less than 6 months. By Toyota's own admission, the Customer Support Program covered approximately 946,100 vehicles. This part failure put the safety of those on the road in front of me—and me—at risk.

The 2013 pruis has developed the notorious brake booster fault triggering the brake light abs light and traction control light to stay illuminated. Toyota has many complaints about this brake booster issue and needs to recall and fix this issue as they have done on other Toyotas. This is leaving owners with a $2500 repair or having to take a big risk driving these cars with a big prevalent brake issue that Toyota needs to be held accountable for.

While driving on a highway overpass, the brake booster system suddenly failed in my 2013 Prius on March 12, 2024. The vehicle displayed Diagnostic Trouble Code (DTC) 1391, which is a known issue with Toyota Prius vehicles. Toyota offered an extended warranty for this repair that expired in August of 2023, admitting that their vehicles contained faulty parts. There have been several complaints about this known issue and an investigation needs to be reopened regarding this ongoing issue. Will someone from the NHTSA please start an investigation or facilitate in any way to get an investigation into to this reoccurring issue. Brakes matter and society is depending on government and corporations to be transparent and ethical. The FTC, BBB and Attorney General’s need to act on behalf of everyone in keeping our roads safe and holding Toyota accountable again. This is absolutely a major safety issue that should be covered by Toyota regardless of when it manifests.

- The Hydraulic Brakes, or brake actuator, failed. I have taken it to my local mechanic and they confirmed. - My brakes are operating at a substantially reduced capacity - an emergency mode that only allows for the front brakes to work - Yes, my local mechanic confirmed the problem - It has only been inspected by my local mechanic - yes, several warning lights came on while I was driving.

The brake pump which pressurizes the nitrogen accumulator kept cycling on more and more frequently until it was cycling on every 8 seconds after stopping while trying to maintain pressure in the automated brake system. Brake pressure began pulsating when applying brakes and was slowly becoming noticeably more unstable as time progressed. I could also hear a steady flow of fluid through the booster/master cylinder unit. This seems to be a common issue often being discussed online in forums like “Prius Chat”, an online car community describing the characteristics of the power brake system in this vehicle before it fails as well as with a number of online youtube mechanics replacing these units. It seems as though the solution is for dealerships to charge in many cases more than 4000 dollars to replace both the entire “Brake Booster Assy, w/Master Cylinder” and the “ Pump Assy, Brake Booster” as standard procedure. I believe it’s the ‘Brake Booster Assy, w/Master Cylinder’ unit causing the issue, I do all my own repair work on my vehicles and I partially disassembled the booster/master cylinder unit, upon removing the cover for the circuit board control unit integrated into the assembly I discovered evidence of an overheated or corroded circuit board. The soldered pins for the main bus connecting the wiring harness to the circuit board showed possible charing and discoloration as well as very dull colored soldered joints. This was also observed at the bottom of the circuit board as well. After replacing both assembly units in the vehicle the brakes work flawlessly again. I was told by the parts salesman at the local Toyota dealership that he had been selling a lot of these replacement units lately.