There are 4 owner-reported brakes complaints for the 2010 Mercedes-Benz C-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Rear subframe rust out and rear passenger brake line corrosion. The entire subframe has to be taken apart in order to reach the brake line. The vehicle is due to get the rear subframe replaced as part of the warranty extension. The brake lines are not covered. Took it into Mercedes Benz Dealership in Santa Fe, NM. They will not even touch it because they don't even know how repair it.Also they never done this type of work.
The right rear brake line had rusted out and caused complete brake failure while driving. If this occured at highway speeds it could have resulted in serious injuries. A search has shown this is widespread with the C300 and other mercedes vehicles and although mercedes has acknowledged this in other vehicles it has not done so for the C300. This is a potential for serious bodily injury and should be addressed.
My brake line is corroded and needs replacing at a cost of $3500.00. I have an extended warranty on the rear subframe due to a recall; however, Mercedes will not cover this costly repair. I was informed by service advisor that I could still drive car with extra caution, as there are no leaks.
TL* THE CONTACT OWNS A 2010 MERCEDES BENZ C300. WHILE PARKED, THE CONTACT NOTICED THAT THE BRAKE LIGHT WAS ILLUMINATED ON THE INSTRUMENT PANEL. WHEN DEPRESSING THE BRAKES, THERE WAS A GRINDING SOUND COMING FROM THE VEHICLE. THE VEHICLE WAS TAKEN TO THE DEALER FOR DIAGNOSTICS. THE TECHNICIANS STATED THAT THE BOOT, ROTORS AND THE BRAKE PADS NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE VIN WAS NOT AVAILABLE. THE APPROXIMATE FAILURE MILEAGE WAS 30,000.
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.
Data synced from NHTSA on Apr 25, 2026