There are 1 stored owner reports matching the brakes leading-label group for the 2010 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 1 of 1 matching reports.
Open the full vehicle complaint log (all categories)LOUD GRINDING NOISE DEVELOPED IN RIGHT REAR BRAKE. UPON HIS EXAMINATION, MECHANIC FOUND RIGHT REAR BRAKE CALIPER FROZEN IN THE ENGAGED OR CLOSED POSITION. ALSO, LEFT REAR BRAKE CALIPER FOUND TO BE FROZEN IN THE DISENGAGED OR OPEN POSITION. IN ESSENCE, BOTH REAR BRAKES WERE INOPERABLE! WE WERE DRIVING A CAR THAT ONLY HAD FRONT BRAKES FUNCTIONING PROPERLY. OUR MECHANIC COULDN'T REMEMBER A CASE WHERE BOTH REAR BRAKES WERE INOPERABLE ON A CAR. WE BELIEVE THIS PROBLEM TO BE UNACCEPTABLE AND EXTREMELY DANGEROUS ON A VEHICLE WITH ONLY 74,314 MILES AND ONLY 5 YEARS OLD.
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.