There are 2 stored owner reports matching the brakes leading-label group for the 2005 Kia Optima in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 2 of 2 matching reports.
Open the full vehicle complaint log (all categories)BRAKES TURNED TO SPONGE ON AT LEAST THREE SEPARATE OCCASIONS IN FALL 2009, AGAIN IN FEB 2010,SUMMER 2010 AND AGAIN 12/ 22/ 2010. AT FIRST OCCURRENCE WINTER OF 2009 I ASSUMED I HAD HIT ICE AND WAS UNABLE TO BRAKE FOR THAT REASON. HOWEVER, EVERY INCIDENT AFTER THAT CONFIRMED THAT ROAD CONDITION WAS NOT A CONTRIBUTING FACTOR. DURING FIRST EVENT THE BRAKES WERE NOT FUNCTIONING,CAR CONTINUED TO MOVE FORWARD AT RED TRAFFIC LIGHT. BRAKE FAILURE RECURRED TWICE AT 4 WAY STOP AND AGAIN ON RESIDENTIAL STREET AS I AM PREPARING TO PARK. NOTE THAT THESE INCIDENTS ALL OCCURRED AS I WAS CONSCIOUSLY SLOWING THE VEHICLE AND PREPARING TO COME TO A FULL STOP. SPEED OF VEHICLE AT THE TIME OF ALL THE ABOVE INCIDENTS IS ESTIMATED LESS THAN OR EQUAL TO 15 MPH. WHAT WE HAVE HERE IS VEHICLE THAT RANDOMLY WILL NOT COME TO A COMPLETE STOP ALTHOUGH INSPECTION REVEALS BRAKES ARE IN GOOD WORKING ORDER AND TIRES ARE NEW. DEALER INSPECTED VEHICLE FEB 12, 2010 AFTER CAR WOULD NOT STOP AT STOP SIGN CONSEQUENTLY I WAS FORCED TO TURN THE CAR INTO SNOW BANK TO HALT VEHICLE. OTHERWISE I WOULD HAVE BROADSIDED ONCOMING TRUCK IN N/S 4 WAY. DEALER COULD NOT FIND ANYTHING AND EVENT DID NOT REOCCUR WHEN DEALER TEST DROVE VEHICLE. LAST NIGHT 12/22/2010 HAD TO THROW CAR INTO PARK AND TURN OFF ENGINE IN MID TRAFFIC AS OTHER VEHICLES ARE BRAKING BECAUSE OF RAPID CHANGE TO SLOW IN 45 MPH ZONE. MY CAR IS CLIMBING HILL AS CARS AHEAD ARE BREAKING FOR STALLED, SLOW TRAFFIC. RANDOM PROBLEM WITH BRAKES OCCURS MORE OFTEN AT LOW TEMP ALTHOUGH HAS OCCURRED ONCE IN SUMMER. NOTE TEMPERATURE AT EVENT LAST NIGHT 28F AT 6:30 PM. BRAKE FLUID TESTED GOOD ON FEB 12, 2010 AT INSPECTION. BRAKES WERE IN FINE WORKING ORDER, TIRES NEW. COMPUTER DIAGNOSTIC INSPECTION CHECKED OUT FINE. I REPORTED SUBSEQUENT BRAKE FAILURE EVENTS TO KIA (AFTER FEB 12, 2010) BUT AFTER CALLING KIA ON 12/23/10 I FIND THEY DID NOT RECORD SAID EVENTS IN KIA DATABASE ALTHOUGH I WAS ASSURED MY PHONED IN REPORTS IN WERE DOCUMENTED. *LN
HYDRAULIC MASTER CYLINDER IN THE CLUTCH MALFUNCTIONED CAUSING THE CLUTCH TO STAY ENGAGED. I DID NOT HAVE A COLLISION BUT WAS FORCED TO LEAVE THE ROADWAY TO AVOID HAVING A TRUCK STRIKE ME FROM THE REAR. WHEN I TOOK THE VEHICLE TO A DEALER THEY REFUSED TO LOOK AT THE VEHICLE UNLESS I PREPAID THEM, AND THEY WOULD LATER DETERMINE IF I WOULD REIMBURSED. NOTE THAT THE CAR HAD ONLY FOUR YEARS AND 27K MILES OF A 10 YEAR/100K WARRANTY. THIS DEFECT IS EXTREMELY DANGEROUS AND SOMEONE NOT HAVING MULTIPLE DEFENSIVE DRIVING COURSES AND TRAINING MAY NOT HAVE KNOWN HOW TO RESPOND. THE SITUATION WAS ENTERING ONTO AN INTERSTATE WITH HEAVY TRAFFIC. IF THE CAR HAD BEEN WORKING PROPERLY THE ENTRY WOULD HAVE BEEN SAFE WITH TIME TO SPARE. WITH THE CAR NOT ACCELERATING AND GIVING THE FEELING OF BEING IN NEUTRAL MOVING TRAFFIC HAD LITTLE OR NO TIME TO RESPOND. *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.