2012 Mercedes-Benz E 3.0L Diesel · YK12 FBS

Persistent corrosion of the brake lines stands as the primary mechanical concern for this vehicle, with the issue appearing consistently across multiple MOT tests since 2023. While the car successfully passed its most recent inspection on 12 May 2026, the recurring nature of these advisories suggests that the underlying metallic lines have not been fully rectified, only monitored. The history shows a transition from a period of clean passes between 2020 and 2022 to a more troubled phase in 2023, where the vehicle failed due to tyre integrity and wiper performance. Although the current status is a pass, the persistent flagging of brake pipe corrosion indicates a need for immediate physical verification of the entire braking system's structural integrity. Accumulating 120,875 miles over 14 years results in a consistent annual usage rate of approximately 8,600 miles. This steady mileage profile is typical for a vehicle of this class and age, suggesting it has been used regularly rather than sitting idle for extended periods. There are no significant gaps in the MOT history, which confirms that the vehicle has remained in active service throughout its life. This level of usage implies that the drivetrain and chassis components have been subject to continuous wear, making the condition of suspension bushings, wheel bearings, and transmission mounts particularly relevant for a vehicle at this stage of its lifecycle. Prospective buyers must prioritise a thorough inspection of the brake lines, specifically focusing on the offside front and rear sections noted in the recent history. During a test drive, the brake pedal should be tested for any sponginess or excessive travel, which could indicate a loss of hydraulic pressure or compromised lines. Furthermore, the advisory regarding a slightly distorted offside front road wheel requires careful attention; listen for any rhythmic thrumming or vibration through the steering wheel at motorway speeds, as this distortion can lead to premature wear of the wheel bearing and suspension components on that corner. Beyond the braking and wheel concerns, the history of tyre damage and wiper failures highlights the importance of checking all consumable items. Ensure that the windscreen wipers operate smoothly across the entire sweep without streaking, as this was a previous failure point. Given the age and mileage, it is also advisable to inspect the front suspension for any signs of knocking or clunking over uneven surfaces, as the repeated stress on the front end from tyre and wheel issues can accelerate the degradation of control arm bushings and ball joints. A professional lift inspection is recommended to confirm the extent of the corrosion on the brake pipes and to assess the condition of the subframe and floor pan for any hidden structural oxidation.