2015 Mercedes-Benz ML 3.0L Diesel · ASH 21F

The latest MOT test on 2026-03-13 resulted in a passing outcome, but the vehicle’s maintenance history reveals a concerning pattern of recurring brake-related advisories and a single failed test in 2026-03-09, which included a dangerous failure for offside front brake pads being below the legal minimum thickness of 1.5 mm. This trend indicates that brake wear is a persistent issue, with the front and rear pads consistently nearing or exceeding the advisory thresholds over multiple tests. The fact that the same defects recurred across three separate MOTs suggests either inadequate or delayed maintenance, or a fundamental design or installation flaw affecting brake system performance. While the 2024 and 2023 MOTs were clean, the 2026 failures underscore a lack of proactive servicing, particularly concerning the front brakes, which may have been neglected until critical wear thresholds were reached. The vehicle’s recorded mileage of 90,978 miles at the time of this assessment represents a moderate annual usage rate of approximately 8,271 miles per year, which is within the expected range for a 11-year-old ML given its age and typical UK driving conditions. However, the mileage data alone do not fully explain the maintenance issues, as lower mileage could imply periods of inactivity or infrequent use, which often exacerbates wear from standing or prolonged idling. For instance, standing brakes can cause corrosion on brake discs and pads, leading to premature failure, while fluid degradation in hydraulic systems accelerates when not in use. The absence of a clear pattern of high-mileage accumulation suggests that the wear observed may be more related to maintenance neglect rather than excessive driving, but this remains speculative without further details on service history. Given the recurring brake advisories and the dangerous failure in 2026, the buyer should prioritise a thorough inspection of the braking system, focusing on the front and rear pads, discs, and hydraulic fluid levels. On a test drive, listen for unusual grinding noises during braking, which could indicate worn pads or impending disc failure, and check for a firm but even pedal feel—softness or sponginess may signal air in the brake lines or hydraulic fluid degradation. Inspect the brake discs for excessive pitting, scoring, or uneven wear, which can compromise braking efficiency and safety. If the pads are confirmed to be below 1.5 mm thick, they must be replaced immediately, as this is a critical safety threshold. Additionally, visually inspect the brake fluid reservoir for contamination or low levels, as this can lead to brake failure. Beyond brakes, the buyer should also verify the front windscreen washer system functionality, as the 2026 failure highlights a potential long-term issue with washer liquid supply. For the broader vehicle assessment, the buyer should conduct a comprehensive physical inspection of the ML, particularly focusing on the suspension and exhaust systems given the age and mileage. Check for signs of suspension bush wear, such as clunking noises when driving over bumps or uneven road surfaces, which could indicate failing coil springs, control arm bushings, or strut mounts. Inspect the exhaust system for leaks, rust, or structural integrity, as corrosion is common in older vehicles, especially if they have been stored in damp conditions. Pay attention to the tyre condition, including sidewall perishing or cracking, which can compromise tyre safety and structural integrity over time. Given the vehicle’s age, the 12V battery should be tested for charge retention and overall health, as older batteries may struggle to maintain power during prolonged periods of inactivity. Finally, the buyer should verify that all service records are up to date, particularly for fluid servicing—oil, brake fluid, coolant, and transmission fluid—since these should be replaced at specified intervals, even if the MOT history is clean. If the vehicle has been stored for extended periods, a thorough fluid change and battery check are essential to prevent long-term damage.