There are 2 owner-reported brakes complaints for the 2022 Mercedes-Benz C-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The contact owns a 2022 Mercedes-Benz C300. The contact stated while driving at unknown speeds, the active brake assist was not functioning properly. The brakes were applied without an object around the vehicle. There were no warning lights illuminated. The local dealer was contacted and scheduled an appointment. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 20,000.
When I brake the car makes a clunking noise and I can feel a thumping on the brake pedal as I try and bring the car to a stop. This car is brand new. I have owned it for almost 3 weeks and it has less than 100 miles on it. You can both hear and feel the the clunk/thump as you attempt to brake the car. It seems as if it is coming from the drivers side of the car. I actually heard and felt this issue on May 23, 2022 3 days after I took delivery of the car. But I wasnt sure exactly what I felt. I haven’t Devine the car a lot until yesterday due to some medical issues I was having. Yesterday the issue was very bad every time I braked I could hear the clunk noise and feel it on my brake pedal. Contacted dealer and they have no reported issues. Car is going for service today. I am reporting this because it affects the brakes and that could be dangerous if the car is unable to be stopped.
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