There are 1 owner-reported brakes complaints for the 2003 Lexus ISin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
THE BRAKES FAILED AT 143,840 MILES. THE BRAKES FAILURE OCCURRED WHILE DRIVING THE CAR ON A BUSY CITY STREET. AFTER INSPECTION BY A MECHANIC AT FIRESTONE AUTO CARE..IT WAS DETERMINED THAT A NOTICEABLE INTERNAL LEAK WAS COMING FROM POWER BRAKE BOOSTER. IT WAS ALSO DETERMINED THAT THE MASTER CYLINDER AND POWER BRAKE BOOSTER MUST BE REPLACED.
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.
Data synced from NHTSA on Apr 25, 2026