Home · 2021 Mercedes-benz E-class Cabriolet · Complaints

What 19 owners told NHTSA about the 2021 Mercedes-benz E-class Cabriolet

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (19)Crash / fire / injury (1)Electrical system (7)Engine (6)Backup camera & sensors (3)Fuel system (3)Transmission & drivetrain (2)Brakes (1)Wheels (1)

1 of 19 complaints match · Wheels · clear filters

Jun 23, 2022Wheels

After the car sits for three or more days, brakes locks up. It takes lots of power to get the brakes to release. It’s a safety concern as the car is parked in the garage with not enough room to maneuver. We never had any car which locks the brakes in this manner. Took it to MB dealer and they say it’s the way brakes are designed. A complete nonsense.

NHTSA ODI 11470644

Working with the data? Download all 19 complaints as CSV · fetched from NHTSA July 14, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2021 Mercedes-benz E-class Cabriolet verdict →