2012 Mercedes-Benz B-Class 1.8L Diesel · YF12 XBB

The vehicle holds a valid MOT certificate issued on 3 December 2025 at 89,720 miles, although the maintenance trend has shifted from stable to a mild decline. Between the clean passes of November 2024 and December 2023, the most recent test flagged all four brake discs as worn, pitted, or scored. Both rear brake pipes were also noted as corroded and contaminated with grease or debris. These are advisory-level observations rather than outright failures, yet their simultaneous appearance across the full braking system suggests a period of deferred inspection or component fatigue that warrants closer scrutiny before purchase. At 14 years old with 89,720 miles recorded, the annual average sits at roughly 6,409 miles, which is typical for a vehicle of this age. The mileage progression is consistent and well-documented, with no large gaps or sudden accumulation between tests. The 2022 failure at 81,000 miles was limited to a defective wiper blade, a faulty washer, and a single stop lamp, all of which were rectified the same day. The subsequent two tests in 2023 and 2024 recorded zero defects, indicating a period of sound upkeep before the braking-related advisories surfaced in December 2025. A buyer should focus the physical inspection on the braking system and underbody condition. The pitted and scored discs on all four corners point toward aggressive pad friction, moisture exposure, or prolonged standing. Grease or material contamination on the rear brake pipes raises the question of whether those lines have been disturbed, poorly repaired, or simply neglected in a corrosive environment. A thorough check of the pipe routing, flexible hoses, and any signs of active weeping or fluid loss is essential. Suspension bushes and coil springs deserve equal attention, as vehicles of this age and mileage frequently develop play or fatigue that may not yet trigger a formal advisory but will affect handling and future test outcomes. Beyond the braking system, the overall structural integrity of the floor pan, sills, and subframes should be examined for corrosion, especially if the car has spent time in coastal or salted-road areas. The clean MOT record through 2024 suggests no major mechanical collapse, but the cluster of advisories in the latest test is a clear signal that consumable and safety-critical components are entering a wear-out phase. Budgeting for a full brake refresh and a detailed underbody inspection would be a prudent step before committing to the purchase.