2012 Mercedes-Benz C 2.1L Diesel · YA12 ABF

The most recent DVSA MOT test on 17 April 2026 resulted in a pass, though two advisories were recorded concerning brake pipe corrosion covered in grease or other material on the rear line and brake disc wear with pitting and scoring on both front discs. Reviewing the four-year MOT history, the overall maintenance trend appears broadly stable but with a clear and worsening pattern relating to the braking system. The 2024 and 2023 tests were passed with no advisories, suggesting the vehicle was in good order at that point. However, from 2022 onwards the advisories have accumulated progressively, starting with front disc wear and isolated brake pipe corrosion on the nearside front, then expanding in 2025 to multiple corroded brake pipes and disc wear on both front corners, and culminating in the 2026 test with rear brake pipe corrosion now flagged alongside continuing front disc deterioration. This pattern indicates that brake hydraulic and friction components are entering a phase requiring closer attention and probable remedial servicing in the near term. The recorded mileage of 49,592 miles on a 14-year-old vehicle equates to an annual average of approximately 3,542 miles, which is notably low for the age and class of car. Such low usage typically implies either consistent light running, significant periods of standing, or a combination of both. Mechanically, low annual mileage reduces wear on internal drivetrain components such as the engine, transmission and turbofings, but it accelerates degradation of age-sensitive items including brake discs through corrosion from infrequent use, brake fluid through hygroscopic moisture absorption, coolant degradation, rubber seals, and the 12V battery. Any prolonged periods of standing can also promote binding of brake calipers, flat spots in tyres, and perishing of weather sealing. Given the recurring advisories on the brake system, a prospective buyer should conduct a focused inspection of the braking components before purchase. The front brake discs should be examined for lipping, severe pitting beyond the advisory threshold, and minimum thickness against the manufacturer specification stamped on the disc hub. On a test drive, listen for any grinding or squealing under light braking, feel for brake shudder through the steering wheel indicating disc run-out or uneven wear, and check for the vehicle pulling to one side which would suggest a binding caliper or uneven pad wear. The brake pipes should be physically inspected along their length, particularly at unions and mounting clips, for active corrosion, flaking, or any weeping of brake fluid, since the grease coating noted in advisories may be masking underlying rust and the pipes will likely require replacement in the short to medium term. The rear brake components, not previously flagged but now showing advisories, should be checked for caliper slider operation, handbrake adjustment, and drum or disc condition. Brake fluid should be tested for boiling point as it is typically a two-year service item and may be well overdue on a low-mileage vehicle of this age. Beyond the braking system, several age-related and low-mileage checks are warranted. Tyres should be examined closely for sidewall cracking or perishing from age, as rubber compounds degrade with calendar age irrespective of tread depth, and any tyre older than six years from its DOT date stamp should be regarded as suspect even with legal tread remaining. The 12V battery should be load tested, as batteries on low-mileage vehicles often suffer from chronic undercharging leading to sulphation and sudden failure; a date code sticker on the battery will indicate its age. All fluid levels and conditions should be verified, including engine oil, coolant strength and specific gravity, power steering fluid, and the automatic or manual transmission fluid, with service records cross-referenced against the schedule. The underside of the vehicle should be inspected on a ramp for corrosion, particularly around suspension mounting points, subframes, and exhaust hangers, given the visible brake pipe corrosion already noted. Finally, the full service history should be examined to confirm that time-based services such as coolant, spark plugs, drive belts, and the Mercedes-Benz flexible servicing schedule have been adhered to, as calendar age rather than mileage governs many of these replacement intervals.