2011 Mercedes-Benz ML 3.0L Diesel · EK11 AEN

The defining mechanical thread across this ML's MOT history centres squarely on the brake hydraulic system and the related friction components. The earliest recorded test in 2020 produced a fail with two major items: insufficient brake pedal reserve travel, pointing toward either a brake servo or master cylinder concern, alongside an excessively corroded nearside rear brake pipe. That same visit flagged pitting and scoring on both front and rear brake discs as wear items. Six years on, the most recent pass on 3 July 2026 was completely clean, but the 2025 test in between recorded advisories on both front brake pipes for corrosion covered in grease or other material, plus an offside rear brake described as binding slightly. The cumulative picture is one where the underbody brake lines have been a recurring area of examiner attention, the discs have shown progressive surface deterioration, and a sticking rear caliper has now been noted. The intervening tests from 2021 through 2024 passed without recorded brake-related defects, so the trend is not one of constant decline, but the brake hydraulic and friction package is demonstrably the area requiring the closest scrutiny on inspection. Against a fifteen-year build span and 138,070 recorded miles, the vehicle has accumulated roughly 9,200 miles per year, which sits close to the expected average for a diesel or large petrol SUV of this vintage used as general family or long-distance transport. There are no extended gaps between tests, with annual examinations consistently recorded from 2018 onwards, suggesting the vehicle has remained in regular active use rather than being laid up for long periods. That said, the mileage band itself is substantial for an ML-Class of this generation, and components typically subject to wear proportional to distance covered, including the seven-speed automatic transmission, the air suspension compressor and air struts on the later ML variants, the transfer case, and the diesel injector and turbo assembly if fitted, will all have accumulated significant working hours. The lack of any recorded advisories for fluid leaks, suspension component failures, or exhaust corrosion across six years of tests is a positive data point, but buyers should treat a fifteen-year-old high-mileage SUV with the expectation that age-related degradation exists beneath the visible MOT record. A physical inspection should begin underneath the vehicle with the brake pipework. The 2025 advisories noted corrosion on the offside and nearside front pipes concealed beneath grease, and the 2020 fail recorded an excessively corroded nearside rear pipe. These steel lines run along the chassis outboard and are vulnerable to road salt and stone chip damage, particularly on a vehicle with this mileage and age profile. Look for surface rust blooms, flaking, and any signs of previous patching or replacement sections, and expect that the full pipe run may need sectional replacement to pass a future test. The offside rear caliper binding slightly should prompt a check that the handbrake mechanism releases fully and that the rear rotor is not running excessively hot after a short drive. On the road, listen for any grinding or rubbing from the rear wheels when first moving off, and verify that the pedal feels firm with adequate reserve travel before pulling away, as the 2020 fail specifically flagged insufficient pedal reserve. The suspension and steering should be tested with the vehicle at normal operating height, paying particular attention to knocking or clonking over speed humps and uneven surfaces, which on the ML often points to worn lower control arm bushes, anti-roll bar drop links, or the radius arms that are known wear items on the earlier W164 platform. With 138,000 miles on the clock, expect some wear in these joints regardless of what the MOT tests have formally recorded, as advisories are only raised at the examiner's discretion and silent bushes can still be perished. Test the steering for any vagueness on centre, clonking through the steering wheel on full lock, or uneven tyre wear that would suggest geometry or component wear. Finally, examine the wheels and tyres for uneven shoulder wear on the inside edges, which would indicate alignment or suspension geometry issues, and check the discs visually for lip formation and surface rust pitting, particularly on the rear axle given the recorded binding. A thorough road test on a wet road surface to assess ABS function and a check of all dashboard warning lights on startup will round out a sensible pre-purchase evaluation.