2014 Toyota Prius

The contact owns a 2014 Toyota Prius. The contact stated that while driving at an undisclosed speed, the vehicle failed to slow down as intended with the brake pedal depressed. The ABS warning light was occasionally illuminated. The vehicle was pulled over to the shoulder of the roadway and restarted. The vehicle was taken to a local independent mechanic, where it was diagnosed, and determined that the brake master cylinder, brake booster, and brake lines needed to be replaced. The local dealer was contacted; however, the vehicle was not diagnosed or repaired. Upon further investigation, the contact related the failure to an undisclosed recall; however, the VIN was not included in the recall. The manufacturer was notified of the failure. The contact was referred to the NHTSA Hotline for assistance. The failure mileage was approximately 152,000.

The contact owns a 2014 Toyota Prius. The contact stated that the ABS and the traction control warning lights were illuminated. The vehicle was taken to the dealer to be diagnosed, and the contact was informed that the brake master cylinder needed to be replaced. The vehicle was not repaired. The vehicle was taken to a certified mechanic and was diagnosed, and it was determined that the brake booster had failed and needed to be replaced. The vehicle was repaired; however, one day later, both warning lights returned. The vehicle was returned to the mechanic and air was blown into the hydraulic valves and the other valves were cleaned; however, the failure persisted. The manufacturer was not informed of the failure. The failure mileage was approximately 150,000.

The contact owns a 2014 Toyota Prius. The contact stated while driving at an undisclosed speed, the vehicle failed to stop or decelerate as intended while the brake pedal was depressed. The ABS and service brake warning lights were illuminated. The contact added brake fluid; however, the failure persisted. The vehicle was taken to a local dealer where it was diagnosed; however, the cause of the failure was not yet determined. The vehicle was taken to a local Auto Zone, where it was scanned with an OBD2 scanner and DTC: C1391; was retrieved. The vehicle was not repaired. The manufacturer was notified of the failure and the contact was informed that the failure was related to an unidentified Toyota Campaign; however, the warranty had expired. The failure mileage was approximately 92,802.

The contact owns a 2014 Toyota Prius. The contact stated while driving at an undisclosed speed, the brake pedal was depressed with several unknown warning lights illuminated. The vehicle was towed to the dealer to be diagnosed. The contact was informed that the brake master cylinder and the brake booster pump assembly had failed and needed to be replaced. The manufacturer was not made aware of the failure. The failure mileage was approximately 82,000.

The contact owns a 2014 Toyota Prius. The contact stated that while driving at an undisclosed speed and attempting to stop the vehicle, the brake pedal was stiff and would not depress easily, requiring exhaustive effort to depress and bring the vehicle to a complete stop. The brake, traction control, and ABS warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a brake booster and brake pump assembly failure. The vehicle was repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was 116,000. The VIN was not available.

TL* THE CONTACT OWNS A 2014 TOYOTA PRIUS. THE CONTACT STATED WHILE DRIVING 35 MPH, THE VEHICLE LOSS MOTIVE POWER WITH THE CHECK ENGINE AND HYBRID BATTERY WARNING LIGHTS ILLUMINATED. THE VEHICLE WAS TAKEN TO LITHIA TOYOTA OF MEDFORD (1420 N RIVERSIDE AVE, MEDFORD, OR 97501) WHERE IT WAS DETERMINED THAT THE HYBRID BATTERY INTAKE FAILED AND NEED TO BE REPLACED. THE VEHICLE WAS REPAIRED. TWO WEEKS LATER FAILURE AN ABNORMAL SOUND WAS HEARD COMING FROM THE BRAKES. THE VEHICLE THEN WAS TAKEN BACK TO THE SAME DEALER HOWEVER, A DIAGNOSTIC TEST WAS STILL PENDING. THE CONTACT REFERENCED NHTSA ACTION NUMBER: DP19004 (SERVICE BRAKES, HYDRAULIC) 18V684000 (HYBRID PROPULSION SYSTEM) AS POSSIBLE SOLUTIONS TO THE FAILURES HOWEVER, THE VIN WAS NOT INCLUDED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 112,971.

THE EDR REPORT CLEARLY SHOWED THAT THE BRAKE OIL PRESSURE CHANGES DID NOT CORRELATE WITH THE PROGRESSIVELY INCREASING VEHICLE DECELERATION. THE ISSUE IS OCCASIONAL, RARE AND CANNOT BE REPRODUCED EVERY SINGLE TIME. THIS LEADS TO DISPARITY IN ASSUMED BRAKING DISTANCE FROM ROUTINE EXPERIENCE BY DRIVING THE VEHICLE AND ACTUAL BRAKING DISTANCE AT THE TIME OF FAILED BRAKING WHICH SUPPOSEDLY MAY BE AS A RESULT OF INVERTER ISSUES THAT ARE RESPONSIBLE FOR EXCLUSIVELY REGENERATIVE BRAKING AT LOW (<50 MPH) SPEEDS.

THE CAR BRAKES FAILED AT LOW SPEEDS (10-15 MPH) AND BUMPED INTO THE CAR IN FRONT IN A STOP-AND-GO TRAFFIC ON THE WET FREEWAY AFTER A RECENT RAIN. THE BRAKE PEDAL WENT ALL THE WAY DOWN TO TOUCH THE FLOOR, AS IF THE BRAKE PEDAL WAS DISENGAGED FROM THE BRAKING SYSTEM AND THE ABS LIGHT DID NOT TURN ON AT THE TIME OF BRAKING. THE CAR WAS DRIVING IN THE STRAIGHT LINE AND IMMEDIATELY BEFORE THIS I WAS ABLE TO SUCCESSFULLY BRAKE THE CAR ON THE VERY SAME TRIP. SO THE PROBLEM IS INTERMITTENT. THIS IS THE SECOND TIME WITH THIS CAR, AS MY SPOUSE ALSO EXPERIENCED THE SIMILAR BRAKE FAILURE AT EVEN LOWER SPEEDS (<10 MPH) RESULTING IN TOUCHING THE CAR IN FRONT AND MINOR SCRATCH ON THE BUMPER. IT WAS A DRY DAY THEN AND ALMOST SIMILAR CIRCUMSTANCES. ASSOCIATED GEICO CLAIM NUMBER IS 0423477190101054. WE OPENED A CASE WITH TOYOTA TO CHECK THE DATA RECORDER. ASSOCIATED TOYOTA CASE NUMBER IS 181112370.