2012 Mercedes-Benz C 2.1L Diesel · RS51 AND

The vehicle remains roadworthy but the maintenance history shows a worsening trend regarding the braking system components. While the most recent test in June 2025 at 117,119 miles passed, the tester flagged corrosion on both the nearside and offside rear brake pipes. This issue was also identified during the June 2024 test at 113,971 miles, indicating that the corrosion was not addressed following the previous advisory and has continued to progress over time. The mileage pattern is remarkably consistent for a vehicle of this age, averaging approximately 8,300 miles per year. Data from July 2021 to June 2025 shows steady usage, with the odometer climbing from 107,819 to 117,119 miles over that four-year period. This regularity suggests a standard daily use pattern rather than long periods of stationary, which often leads to more even mechanical wear but can accelerate the degradation of rubber components and the accumulation of surface-related corrosion on the chassis. A buyer must conduct a thorough physical inspection of the rear brake lines to determine the extent of the corrosion. The presence of grease or other material on the pipes in the previous two tests suggests an attempt to mask the rust or a previous leak that has not been properly rectified. Beyond the flagged pipes, the inspection should check for structural integrity on the rear subframe and mounting points, as the recurring nature of the pipe corrosion often points to an environment where salt and moisture have affected the underbody.