2002 Toyota Prius SERVICE BRAKES, HYDRAULIC

2002 TOYOTA PRIUS BRAKING PROBLEM*CW THE CONSUMER STATED HE DIDN'T SEE THE ISSUE AS A BRAKING PROBLEM; RATHER A CONTROL CONFLICT. WHENEVER THE PROBLEM OCCURRED, THE VEHICLE WAS MOVING DOWN A SLIGHT GRADE ON A ROAD SURFACE HAVING ITS SHARE OF PAVING PATCHES, FROST HEAVES, ETC. THE SLIGHT DOWNGRADE CAUSES THE VEHICLES SPEED TO INCREASE, OR PERHAPS AN INTERSECTION APPEARED AHEAD AND FOR WHATEVER REASON THE BRAKES WERE GENTLY APPLIED IN ORDER TO SLOW THE VEHICLE DOWN. WHEN THE PROBLEM OCCURRED, THE SYMPTOM WAS A BRIEF INTERVAL AND THE VEHICLE SEEMED TO ACCELERATE AND THEN NORMAL BRAKING RESUMED AND THE VEHICLE SLOWED DOWN. JUST PRIOR TO THE BRAKE ACTIVATION, THE VEHICLE IS IN REGENERATION MODE, IN WHICH THE ELECTRIC PROPULSION MOTORS ARE ACTING AS GENERATORS, WHERE ENERGY MOTION IS BEING EXTRACTED AND CONVERTED TO ELECTRICAL ENERGY TO BE STORED IN THE VEHICLES BATTERY. WHENEVER THE BRAKE PEDAL IS ACTIVATED, THE FIRST THING THAT HAPPENS IS THAT THE MOTOR NOW BECOME GENERATORS ARE FORCED BY THE CONTROL SYSTEM TO CONVERT SIGNIFICANT ENERGY OF MOTION INTO ELECTRICAL ENERGY. THE CONSUMER BELIEVED THAT THE NORMAL BRAKING SYSTEM SHUTS DOWN. THE CONSUMER BELIEVED THE PROBLEM WAS WITH THE ABS.

TL* THE CONTACT OWNS A 2002 TOYOTA PRIUS. SHE STATED WHILE PULLING OUT FROM A DRIVEWAY AND APPLYING THE BRAKES, THE BRAKES DID NOT ENGAGE AND CAUSED HER TO CRASH INTO ANOTHER VEHICLE. THE VEHICLE SUSTAINED EXTENSIVE DAMAGES TO THE ENTIRE FRONT STRUCTURE AND WAS TOWED FROM THE SCENE. A POLICE REPORT WAS FILED. THE DEALER WAS NOT CONTACTED. THE MANUFACTURER WAS CONTACTED AND A COMPLAINT FILED. THE FAILURE AND CURRENT MILEAGES WERE 24,000.

BRAKE PEDAL POSITION SENSOR. INTERMITTENT FAILURE. CANNOT START CAR EVEN THOUGH FOOT IS ON BRAKE. SOMETIMES REQUIRED AS MANY AS 20 TRIES. CONDITION PERSISTED FROM 2006 UNTIL REPAIRED JAN 2010. AT FIRST ONCE EVERY FEW WEEK AND PROGRESSED TO SEVERAL TIMES A DAY. *TR

SINCE I PURCHASED MY TOYOTA PRIUS IN LATE 2001, IT HAS INTERMITTENTLY SURGED WHEN THE BRAKE IS PRESSED. WHILE I DO NOT HAVE THE HIGH SPEED SURGES THAT OTHER DRIVERS HAVE REPORTED, PERIODICALLY WHEN I AM AT LOW SPEEDS AND PRESS THE BRAKE TO STOP, THE CAR WILL SLOW TO A STOP, THEN LURCH FORWARD, REQUIRING ME TO PRESS THE BRAKE HARDER TO MAINTAIN CONTROL. I REPORTED THIS TO TOYOTA IN 2001 AND 2002, BUT I WAS TOLD THAT THIS WAS NORMAL FOR A HYBRID, WHICH WAS FAIRLY NEW TECHNOLOGY AT THE TIME. I AM CONCERNED THAT IN THE FUTURE I MAY HAVE A HIGHER SPEED SURGE. SO FAR MY SURGES HAVE BEEN LOW SPEED, AND I HAVE BEEN ABLE TO CONTROL THEM BY PRESSING THE BRAKE HARDER. *TR

2002 TOYOTA PRIUS. CONSUMER STATES HE EXPERIENCED TEMPORARY BRAKE FAILURE IN COLD WEATHER. *TGW THE PEDAL FELT AS IF IT WERE FROZEN OR BLOCKED AND WOULD NOT GO DOWN NO MATTER HOW HARD THE CONSUMER APPLIED IT. NORMAL BRAKE FUNCTION RETURNED AFTER A FEW MINUTES. *JB

RIGHT FRONT DISC BRAKE PADS WERE INSPECTED ON 9-3-2009 BUT ON 10-23-2009 GRINDING NOISE BEGAN. PADS AND ROTORS ON FRONT BRAKES WERE REPLACED. TOLD METAL TO METAL CONTACT HAD DEVELOPED AND VEHICLE WAS UNSAFE TO DRIVE. *TR

BRAKE AND ABS LIGHT CAME ON. BRAKES LOST COMPLETE BRAKING ABILITY. LUCKILY WE WERE ON A HILL OFF THE INTERSTATE EXIT WHEN THIS HAPPENED SO THE CAR COULD NOT GO FURTHER, THOUGH IT ALMOST CRASHED INTO THE PERSON IN FRONT OF US (THAT PERSON TURNED OFF ROAD). THIS IS 100% DANGEROUS! THE CAR CURRENTLY SITS AT MY HOUSE. TOO DANGEROUS TO DRIVE. WHEN BRAKE PADS WERE CHECKED LAST I WAS TOLD BRAKES WERE 80% NEW, SO IT IS CLEARLY NOT THE PADS. *TR

BRAKE LIGHT CAME ON FREQUENTLY. DEALERSHIP REPORTS BRAKE ACCUMULATOR BOOSTER ASSEMBLY LEAKING. DEALERSHIP TOLD ME IT WAS A SAFETY ISSUE THAT COULD CAUSE BRAKE FAILURE. DEALERSHIP REPLACED THE BRAKE BOOSTER, ACCUMULATOR ASSEMBLY. *JB