2011 Mercedes-Benz B-Class 2.0L Diesel · LL11 EJO

The most recent DVSA test outcome dated 23 October 2025 shows that the vehicle passed with no defects recorded; however, this pass immediately followed a dangerous failure on the same date for rear brake pads worn below 1.5 mm on both sides, with both rear brake discs also recorded as significantly and obviously worn. This pairing is significant because it indicates the brake friction material and the rear discs were both at the end of their serviceable life and would have required replacement prior to re-test. Reviewing the prior three tests, the rear brake discs, rear brake pipes, and rear fuel pipes have appeared as advisories in consecutive years, demonstrating a clear and progressive deterioration pattern of the braking and underfloor components rather than a single isolated event. While the front-end issues noted in 2022 and 2023, namely front disc wear and a nearside front outer CV boot deterioration in 2024, suggest attention was given to those areas, the rear braking system has been the persistent and unresolved maintenance concern across the MOT history. The recorded mileage of 77,496 miles over approximately fifteen years equates to an annual average of around 5,166 miles, which is well below typical usage for a vehicle of this age and points to either genuinely light motoring or extended periods of standing. Such low annual mileage tends to preserve the major mechanical drivetrain assemblies but introduces age-related concerns, particularly for perishable rubber, polymer, and fluid-based components that degrade with calendar age regardless of distance covered. Tyres, brake hoses, drive shaft boots as already noted, suspension bushes, and the battery are all susceptible to time-based deterioration, and the advisories recorded on the offside front tyre in 2022 and the severely deteriorated CV boot in 2024 are consistent with this age-related wear pattern. Conversely, despite the low mileage, the rear brake wear is unusual, suggesting either infrequent brake use leading to corrosion pitting and uneven pad wear, or a sustained period of light braking combined with the standing time advancing disc corrosion. For a prospective buyer, a careful physical inspection and a structured test drive are strongly advised given the recurring rear braking and underfloor corrosion advisories. On inspection, the rear brake discs should be examined for lip formation, visible ridging, and pitting, while the calipers and sliders should be checked for binding or seizing, which is common on vehicles that have stood for long periods. The rear brake pipes and fuel pipes flagged for corrosion should be visually examined along their full run, particularly at unions and mounting points, as corrosion here can lead to fluid leaks or, in the case of fuel lines, a serious safety hazard. On the test drive, listen for any grinding, scraping, or pulsation through the brake pedal indicating warped rear discs, and observe whether the vehicle pulls to one side under braking. Given the DVSA dangerous failure for pads below 1.5 mm, assume the discs and pads have been replaced; obtain documentary evidence of this work and confirm the components used meet Mercedes-Benz specification, as substandard rear discs can quickly resurface the same wear pattern. Beyond the documented advisories, the low-mileage profile demands attention to several age-driven items that may not surface in MOT data. The 12 volt battery should be load tested, as batteries over five years old frequently fail without warning, particularly on vehicles used for infrequent short journeys. Tyres should be checked carefully for sidewall perishing and cracking, which is often invisible on tread depth alone and will lead to an MOT defect; the 2022 advisory on the offside front tyre suggests this should be a focus area. All fluids, including brake fluid which is hygroscopic and typically renewed every two years, engine coolant, and the automatic transmission fluid if applicable to this B-Class variant, should be confirmed as recently serviced, as a fifteen year old vehicle with low mileage will have experienced considerable calendar-based fluid degradation. Finally, inspect the exhaust system for corrosion at the mounting brackets, joints, and rear silencer, and check the suspension for any knocking or clonking over uneven surfaces, as worn anti-roll bar links, drop links, and lower wishbone bushes are common on Mercedes-Benz vehicles of this generation.