2021 Mercedes-Benz CLA 1.3L Petrol · ST71 ACU

A recurring theme of tyre wear and brake component thinning defines the roadworthiness record of this 2021 Mercedes-Benz CLA, with the most recent test on 1 December 2025 producing a fail followed by an immediate pass after rectification. The failure was primarily driven by a nearside front tyre with tread depth below the legal 1.6mm threshold, classified as dangerous, alongside both headlamps presenting with aim set too low. Advisories issued on the same date flagged a nearside rear tyre worn close to the legal limit and on edge, an offside front tyre similarly worn with a strong advise notation, and nearside front inner brake pads wearing thin. The pattern is not catastrophic but it is a clear signal that the consumable perimeter, particularly tyres and front brake material, is reaching the end of its useful life, and the headlamp aim failure suggests either a suspension settling issue or an improperly adjusted light assembly that warrants close inspection. Mileage accumulation across the recorded period averages roughly 6,778 miles per year over a five-year span, which sits broadly in line with typical usage for a vehicle of this age and segment. There is a thirteen-month interval between the clean pass in October 2024 and the December 2025 retest, during which the vehicle covered only a modest increase in mileage, suggesting either limited use or a period of standing. The relatively low annual mileage means corrosion risks to underbody components, brake discs, and caliper mechanisms are slightly elevated compared to a high-mileage equivalent, particularly given the failures and advisories around brake material and tyre condition, both of which can deteriorate more through age and inactivity than through distance alone. Buyers should be mindful that even at this modest mileage, the wear indicators show the vehicle is approaching a service threshold on multiple front-end consumables simultaneously. A prospective purchaser should focus their inspection on the front axle, where the bulk of advisories are concentrated. The nearside front inner brake pads were flagged as wearing thin, which on a Mercedes-Benz CLA commonly points to the inner pad wearing disproportionately on floating caliper designs, so the discs should be checked for lipping, hot spots, or scoring, and the caliper slide pins should be verified for free movement rather than binding. On the test drive, any pulling to one side under braking, vibration through the steering wheel, or a pulsing pedal would indicate warped discs that have not yet been recorded as an MOT failure. Tyre wear patterns are equally telling: the nearside rear and offside front both showing edge wear could indicate suspension geometry drift, so listen for clonking or knocking from the front struts, top mounts, and anti-roll bar drop links over speed bumps and uneven surfaces, and check for uneven feathering across the tread face which would suggest a geometry or bush issue rather than simple age. The dual headlamp aim failure is a relatively straightforward rectification but should not be dismissed, as misaligned lights on a CLA can occasionally indicate a sagging front suspension strut, a failed xenon or LED self-levelling motor, or simply a manual adjuster that has shifted. Before purchase, verify both headlamps project a flat, level cutoff line against a wall at the standard distance, with the brightest point slightly below the horizontal centreline of the lamp unit. Underneath the vehicle, inspect the front subframe mounting area, brake pipes, and flexible hoses for any surface corrosion or seepage, paying particular attention to the brake calipers for signs of sticking pistons given the inner pad wear advisory. Finally, examine all four tyres for age-related sidewall cracking and confirm the spare or inflation kit is present, as the cluster of wear advisories recorded within a single test suggests this owner was close to the legal envelope on multiple corners simultaneously, a position any buyer will want to move away from immediately after purchase.