2011 Mercedes-Benz B-Class 2.0L Diesel · DU11 AAZ

Significant corrosion issues within the braking and fuel systems represent the primary mechanical risk for this vehicle, following a dangerous failure in April 2026. While the car achieved a pass on 01 May 2026, the immediate history shows a regression from a clean 2025 result to a critical failure involving excessively corroded nearside and offside brake pipes running from front to rear, alongside a dangerous fuel system leak at the filler neck area. This pattern indicates that the previous advisory regarding corroded brake pipes in 2024 escalated into a major structural failure within two years, suggesting that the degradation of these fluid lines is an active and worsening concern. The vehicle has covered 88,753 miles over its 15-year lifespan, which equates to an average annual usage of approximately 5,917 miles. This represents a relatively low mileage profile for a vehicle of this age. While lower annual mileage can reduce wear on certain mechanical components, it can also coincide with periods of limited use which may contribute to the accelerated corrosion observed on the brake pipes and fuel system components. The mileage suggests that the mechanical wear on the drivetrain and engine may be lower than average, but the recorded defects highlight that environmental factors and component aging are the dominant concerns here. A prospective buyer should prioritize a thorough inspection of the entire braking system and fuel delivery network. Given the recent failures, it is essential to verify that the brake pipes have been replaced or adequately treated, rather than merely cleaned, as the 2024 advisories were specifically noted as being covered in grease or other materials. During a test drive, pay close attention to the brake pedal feel; any sponginess, a soft pedal, or a sudden loss of pressure could indicate that the corrosion in the pipes has not been fully rectified or that further degradation is occurring. Additionally, listen for any irregular noises from the rear of the vehicle when braking or accelerating, which could relate to the previously flagged suspension arm bush wear. The recent failure also highlighted a dangerous defect regarding the fuel filler neck area, which requires absolute confirmation of a permanent repair. Check for any scent of petrol around the rear of the vehicle or near the fuel cap, and visually inspect the filler neck for signs of weeping or residue. The advisory regarding a damaged central rear seat belt buckle should also be noted, as this is a safety component that may require replacement to ensure full compliance with seat belt retention standards. Any knocks or clunks felt through the chassis when driving over uneven surfaces should be investigated to ensure the offside front lower suspension arm bush, which was flagged in 2023, has been addressed.