There are 2 stored owner reports matching the brakes leading-label group for the 2005 Lexus IS 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)As I prepared to make a right turn onto a busy street, I suddenly could not brake normally. Instead, I was unable to press the brake down as a balloon like feeling pushed it back up, but it also did not return all the way up to its normal position. The result was I was moving with no way to slow down the car. Fortunately, I was not moving at a high speed and immediately shifted into park. I was fortunate this did not occur while I was at full speed. The brake lights did turn on at the time of the issue. An independent mechanic suspects a brake booster failure. Just a month before, another mechanic performed routine maintenance and found no signs of this issue. Just 6 months before, I purchased the vehicle used with no mention of this sort of past issue.
LEXUS IS300 2005 BRAKE MALFUNCTION. *BF WHEN THE CONSUME ATTEMPTED TO APPLY THE BRAKES, THE VEHICLE WOULD NOT STOP, WHICH RESULTED IN THE CONSUMER HITTING A PARKED VEHICLE. THE CONSUMER BELIEVED THE BRAKE BOOSTER FAILED. *JB
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.