2014 Toyota Prius C service brakes problems

“The brakes failed while driving at a high speed (55 MPH) on the highway along with failing when braking at a low speed (15 MPH) near a major intersection. This occured with no warning other than the Brake, ABS, and Traction Control appearing as the failure was occuring. The warning light when away after the first occurance and the brakes began working again within a few moments. It then reoccured and the lights did not turn off and the car began beeping. My safety, along with my passengers safety and the safety of those who were in the area was put at risk. The highway failure occured in a high traffic area which was also a construction zone so workers were at risk. It has been confirmed by an independent service center that the Power Brake Booster and Brake Master Cylinder Assembly failed. There were no sypmtoms or warning prior to this dangerous failure. After researching this issue, I have found that this is a common issue but no recall has been issued, only a Customer Support Program Bulletin, of which I never received. This is extremely troubling due to the nature of brake failure at both high and low speeds can put not only the driver at risk but those…”

“While driving, suddenly all brake lights and warning lights went on, and brakes stopped working normally. It became difficult to brake (brake took a while to engage - had to press pedal to the floor). After diagnostics at the dealership it looks like the brake booster failed. Apparently Toyota knew about this issue as they did an extended warranty through a Customer Support Program, but unfortunately my issue occurred just past the expiration of that warranty. Since brakes are such a critical component of vehicle safety, if they don't operate well or as expected, it endangers the driver and everyone else on the road. It is wild that Toyota is aware of this issue but that there has been no recall yet.”

“My 2014 Toyota Prius (VIN [XXX] , 77,000 miles) displayed Brake, ABS, and Slip warning lights. A mechanic confirmed failure of the Brake Booster and Pump Assembly (DTC C1391). Toyota previously acknowledged this as a safety-related defect under Customer Support Program ZJB, but my coverage expired because I never received Toyota’s notice dated May 21, 2019. My car has been undrivable for weeks and Toyota refuses goodwill repair. This is a serious brake safety issue that should be reviewed for recall or extended coverage since many Prius owners have experienced the same failure.”

“I was told that my Brake Booster and Brake Booster Pump Assembly needed replaced. I had specifically asked my dealership in the past if there were any issues with my car and was told that there was nothing, which was untrue. I called Toyota and was told that I was mailed something back in 2018, but I do not remember receiving it. Now I am told that this has expired. I wanted to know if I had any recourse or extension time on this program 21 TE01. I am afraid that my brakes will not work, as the lights go off and on. [XXX]”

“There was a safety recall issued for brake system malfunctions involving the brake booster and brake booster pump assemblies on my vehicle. Unfortunately, the recall expired on December 31, 2024. On March 4, 2025, at 4:10 PM, I contacted the District Manager Advocate in Plano, Texas. I explained that I had been in the ICU twice and am now [XXX]. During the recall period, I was in and out of hospitals for more than four years, making it impossible for me to be aware of or respond to the recall in time. My vehicle has since begun exhibiting the exact symptoms outlined in the recall. When I brought this to their attention, I was told that while the issue was indeed covered under a past recall, there is nothing they can do now because it has expired. This vehicle is our only mode of transportation, which is critical for my ongoing medical treatments, as well as for my husband who recently suffered a heart attack. As I write this, we have no other option but to continue using the vehicle—despite the serious safety risk—because of the urgent and necessary care both of us require. On August 4, 2025, I contacted Toyota headquarters. They reached out to the dealership…”

“Cruise Control Not Working. Traction Control Light Active, Brake Light Active, And Light Active The cause was diagnosed by Toyota of Paris. TSB for C1391 Code abnormal leak in accumulator. The corrective action is to replace brake booster assembly with Master cylinder and Brake Booster pump Assembly.”