There are 1 owner-reported brakes complaints for the 2018 Toyota Siennain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
LIGHT, MODERATE TO TOO MUCH VIBRATION ON THE FRONT BRAKE WHEN DRIVING DOWNHILL. I WAS DRIVING DOWNHILL AND I FELT MODERATE VIBRATION ON THE FRONT BRAKE. I WAS SO SCARED THAT I HAVE TO RELEASE THE BRAKE HOPING TO STOP THE VIBRATION. ON THE WAY BACK HOME, I HAVE TO DRIVE ANOTHER DOWNHILL AND THIS TIME, I FELT TOO MUCH VIBRATION ON THE FRONT BRAKE WHEN I APPLIED THE BRAKE. THE VIBRATION WAS TOO MUCH THAT EVEN THE HOOD, I FEEL LIKE IT STARTS VIBRATING AS WELL. WHEN DRIVING FLAT, THE VIBRATION WILL FADE AWAY OR THERE IS NO VIBRATION AT ALL.
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