2016 Mercedes-Benz A-Class 2.1L Diesel · FY66 GAA

The A-Class presents a mixed mechanical picture, with a clean run of pass certificates between 2020 and 2022 giving way to a cluster of brake and tyre advisories from 2023 onwards, culminating in a failure in August 2025. The most recent test on 1 September 2025 returned a pass, but only after a near-miss twelve days earlier when a malfunctioning tyre pressure monitoring system, an empty windscreen washer reservoir, and an excessively fluctuating nearside rear service brake were all flagged as majors. The rear brake disc scoring advisories that have appeared at every test since 2023 indicate a long-standing wear issue that was not rectified between annual tests, and the reappearance of the same nearside rear defect as a fluctuating service brake in the 2025 failure suggests this disc has now deteriorated beyond the advisory threshold into a functional concern. Annual mileage of approximately 10,900 miles over a ten-year period sits broadly in line with the average for a car of this age, so there are no obvious red flags regarding underuse or extended periods off the road. The annual test frequency from 2020 through 2025 is consistent with continuous road use, and the recorded mileages between tests imply no large unexplained gaps in service. Mechanically, this level of use is sufficient to keep consumables cycling but also enough to produce the steady wear pattern seen across brake components and tyres, particularly on a vehicle of this age and weight. A prospective buyer should pay particular attention to the braking system, as the rear discs have been repeatedly noted as worn, pitted, or scored across four consecutive tests, and the 2025 failure indicates the nearside rear caliper or hydraulic circuit may be contributing to the fluctuating brake effort. On a test drive, listen for any binding or pulling to one side under light braking, feel for pedal pulsation or judder through the footwell, and check that the handbrake holds the vehicle firmly on an incline. Inspect all four brake discs through the wheels for visible lipping at the outer edge and scored surfaces, and budget for a full rear disc and pad replacement, with a check of the caliper sliders and handbrake mechanism given the fluctuating brake finding. The tyres also warrant close inspection. Both front tyres were flagged as worn close to the legal limit in 2023, an offside rear tyre showed perishing and cracking in 2024, and a nail was found in the nearside rear tyre in 2025. A walk-round should confirm all four tyres have at least 3mm of remaining tread, no sidewall cracking, and consistent brand and age markings, as uneven replacement patterns are common on high-mileage cars. Finally, verify that the tyre pressure monitoring system is actively reporting pressures on the dashboard rather than displaying a fault, top up the washer reservoir, and ensure the front wipers clear the screen without smearing, as these were the items that turned an otherwise minor advisory into a failure on the most recent attempt.