There are 3 stored owner reports matching the brakes leading-label group for the 2020 Mazda Mazda3 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 3 of 3 matching reports.
Open the full vehicle complaint log (all categories)My car's automatic emergency brake is deploying without warning, during driving, when there are no other cars in my forward proximity. I took it to the dealership to have it fixed, and on the drive home, it did it again. There is a recall for similar makes and models for this year, but my car has not been included.
I WAS DRIVING MY VEHICLE STRAIGHT AHEAD ON A TWO-WAY CITY STREET WITH NO OTHER VEHICLES IN FRONT OR ON MY SIDES. I WAS TRAVELING AT A SPEED OF 40 MPH. THE TWO-WAY STREET IS SEPARATED BY A CONCRETE DIVIDER AND TROLLY TRACKS. A "BRAKE!" ALERT APPEARED ON THE DISPLAY SCREEN FOLLOWED BY BEEPS. SUDDENLY THE BRAKES WERE ENGAGED BRINGING THE VEHICLE TO A COMPLETE STOP CAUSING THE VEHICLE BEHIND TO COME TO A SCREECHING HALT. IN A FEW SECONDS I WAS ABLE TO DRIVE OFF.
The contact owns a 2020 Mazda Mazda3. The contact stated while driving 35 MPH, the ABS warning light illuminated, and the brakes locked up and caused the vehicle to stall. The contact was able to restart the vehicle however, the failure persisted. The contact had taken the vehicle to a local dealer to be diagnosed however, the dealer was not able to duplicate the failure. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 2,000.
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.