2011 Mercedes-Benz B-Class 1.7L Petrol · GU11 OGS

The most recent DVSA MOT test conducted on 28 August 2026 resulted in a PASS, accompanied by two advisories concerning the rear brake discs and a minor engine oil leak. While the vehicle has passed three of its last four tests, the 2025 September test initially failed outright due to non-functioning side repeater and headlamp defects, both subsequently resolved before the same-day retest pass. The recurring theme across all four recorded tests centres on brake pipe corrosion at the rear axle, with these advisories first appearing in 2024 and persisting through to the most recent examination. The escalation from simple brake pipe advisories to scored rear brake discs in 2026 suggests that the braking system has been gradually deteriorating, which warrants close attention even though none of the defects have yet reached failure threshold. With a recorded mileage of 74,425 miles over fifteen years, the vehicle has covered an average of approximately 4,962 miles annually, which is substantially below typical usage for a car of this age and class. Such low annual mileage is characteristic of vehicles used primarily for short urban journeys or those that have experienced extended periods of standing. Mechanically, low-mileage B-Class examples are susceptible to issues including brake caliper seizure or binding from infrequent operation, premature tyre sidewall perishing due to age-related rubber degradation, and 12V battery failure from irregular charging cycles. The relatively narrow gap between consecutive MOT tests and modest accumulated mileage between them indicates consistent but light use, rather than long-term storage, though the original tyres and brake components may still deteriorate through age alone. Prospective buyers should conduct a thorough physical inspection of the rear brake assembly, paying particular attention to the condition of both rear discs for lipping, corrosion pitting, and surface scoring, as the most recent advisory specifically notes wear and pitting not yet deemed serious. A test drive should include firm brake application from moderate speed to detect any shudder, pulsation, or pulling to one side, which would indicate disc warping or caliper malfunction. The persistent brake pipe corrosion advisories at the nearside and offside rear suggest that the metal brake lines, or their protective coating, are degrading and may soon require replacement; an inspection underneath the vehicle for surface rust, flaking, or any weeping of brake fluid from the rear axle lines is strongly recommended. Additionally, the noted engine oil leak, though currently assessed as non-excessive, should be monitored by checking the underside for fresh drips and verifying oil level between services. Beyond the documented MOT advisories, the vehicle's age and low mileage profile demand careful attention to time-sensitive deterioration regardless of the odometer reading. Tyres older than six years, even with adequate tread depth, can suffer internal structural degradation and sidewall cracking; the production date should be verified via the DOT marking on each tyre sidewall. The 12V battery, commonly an AGM or EFB type in Mercedes-Benz models of this era, is highly susceptible to sulphation from low usage and may need imminent replacement regardless of passing electrical checks. All major fluid systems including engine coolant, brake fluid, transmission fluid, and differential oil should be considered for renewal based on calendar age rather than mileage, with brake fluid particularly susceptible to moisture absorption and reduced boiling point over time. The exhaust system, including mounting brackets and underbody protection shields, should be examined for corrosion, and the condition of suspension components such as coil springs, control arm bushes, and anti-roll bar links warrants a thorough visual check given the vehicle's age, as these rubber and metal parts deteriorate through environmental exposure rather than purely through mileage accumulation.