2015 Mercedes-Benz C 2.1L Diesel · WD15 DUY

A pattern of brake-related defects has emerged at the most recent test, breaking what had otherwise been a steady run of clean pass results for this Mercedes-Benz C-Class. On 31 July 2026 the vehicle passed its MOT, but the ten-day gap between a fail on 21 July 2026 and the subsequent pass on 31 July 2026 is highly significant. The failure recorded a major defect against the parking brake lever, meaning it could not be satisfactorily operated, alongside a major entry for brake performance unable to be tested, plus an advisory noting the offside rear parking brake binding. Earlier tests from 2020 through 2025 show clean passes with no defects recorded in 2020, 2023, 2024 and 2025, while 2021 and 2022 carried only tyre-related advisories. The sudden appearance of parking brake and brake performance majors at the 2026 retest represents a clear and recent mechanical concern rather than a long-standing pattern. With 91,910 miles recorded across roughly eleven years of use, this vehicle is accumulating around 8,355 miles annually, which is broadly in line with average UK driving patterns and consistent with steady, regular use rather than extended periods off the road. No multi-year gaps appear in the testing record, with annual tests consistently submitted between 2020 and 2026, indicating continuous road use throughout the period covered. At this mileage, wear on consumable braking and suspension components is to be expected, and the recent brake-related failures align with what one would anticipate from a vehicle of this age and mileage. There is no evidence in the record of very low annual mileage or extended standing periods that would raise separate concerns about stale fuel, seized components or battery deterioration. For a prospective buyer, the parking brake lever defect and the note about the offside rear parking brake binding should be treated as priority inspection items. On a test drive, verify that the handbrake ratchets positively and holds the vehicle securely on an incline, and listen for any scraping, dragging or uneven resistance when releasing it, as binding rear calipers or a stretched cable mechanism are common culprits. Because brake performance was unable to be tested at the recent failure, it is essential to carry out a controlled road test assessing pedal feel, any pulling to one side under braking, and whether the rear calipers release cleanly without the rear wheels feeling hot immediately after use. The near-side front tyre outer sidewall damage flagged at both the failure and the subsequent pass should also be examined closely, as sidewall damage can develop into a bulge or rapid deflation under load. Tyre wear advisories have been a recurring theme, with all four tyres flagged as worn close to the legal limit in 2021 and both rear tyres noted as edge-worn in 2022. Edge wear on rear tyres on a rear-wheel-drive Mercedes-Benz of this era often points to either alignment settings being out of specification, particularly rear camber, or worn suspension linkages and bushes allowing geometry to shift. On a test drive, listen for clonking or knocking noises from the rear suspension over speed humps and uneven road surfaces, and check whether the vehicle feels stable and composed during direction changes. A four-wheel alignment check and a physical inspection of rear suspension components such as trailing arms, subframe mounting bushes and anti-roll bar links would be a sensible precaution before purchase, particularly given the vehicle's age and mileage.