2007 Mercedes-Benz CLS 3.5L Petrol · WU07 EWS

The defining mechanical story for this 19 year old Mercedes-Benz CLS is a chronic deterioration of the brake and front suspension components, culminating in a dangerous failure on 1 December 2025 just days before a clean pass was issued on 6 December 2025. The most recent test is clean, but it directly follows an assessment where both rear brake pads were recorded as less than 1.5 mm thick (a dangerous defect), alongside both front lower suspension arm ball joints being excessively worn. This is the third MOT failure in the recorded history, with prior issues including dangerously worn front brake pads and a heavily corroded offside rear brake pipe in late 2023, plus a headlamp aim issue in 2021. The advisory history reinforces a worsening trajectory rather than a stable one, with the offside front suspension ball joint progressing from slight play in November 2024 to a major failure category within twelve months, and brake pipe corrosion flagged across consecutive 2023 tests. While the 2021 and 2022 tests were entirely clean, the pattern since late 2023 points to a vehicle entering a phase of accelerated wear on its undercarriage. Recorded mileage stands at 97,994 miles against a 2007 manufacture date, equating to an annual accumulation of roughly 5,158 miles. This figure is notably low for a vehicle of this age, which would typically be expected to cover 7,000 to 10,000 miles annually based on average UK driving habits. The MOT record shows consistent annual testing from 2021 onwards with no extended gaps that would suggest the vehicle was off the road for prolonged periods, meaning the low mileage reflects genuinely light use rather than lay-up. For a CLS of this vintage, lower annual mileage can be a mixed mechanical indicator: it reduces wear on major drivetrain components such as the automatic transmission and engine internals, but extended periods of short journeys or standing can accelerate corrosion on underbody components like the brake pipes already flagged in the record, and allow suspension bushes and ball joints to deteriorate through age-related perishing rather than mileage stress. The mileage recorded on the odometer during the most recent test appears consistent with the prior years, suggesting no clock irregularities. A prospective buyer should focus the pre-purchase inspection squarely on the braking and suspension systems that have dominated the recent record. The dangerous rear brake pad failure in December 2025 means a thorough check of all four calipers is essential; binding calipers or seized rear caliper mechanisms are common on older Mercedes-Benz models and can cause uneven pad wear, so each wheel should be inspected for free rotation when jacked and for any scoring on the brake disc surfaces. The front lower suspension arm ball joints should be examined for perished or cracked rubber boots, and a test drive over uneven surfaces should be carried out with the windows down to listen for clonking or knocking from the front end, particularly over speed bumps and cats eyes. Steering should be checked for vagueness through the central position, as worn lower arm joints typically introduce sloppiness before producing obvious noise. The rear brake pipe corrosion flagged in 2023, particularly on the offside line ahead of the fuel tank area, warrants the vehicle being placed on a ramp for a full underbody inspection, as the cosmetic grease coating applied at the time will not arrest ongoing corrosion on steel lines. The wheel bearing advisory from 2023 and the tyre cut noted at the same test also merit specific attention. On a road test, the offside front wheel bearing should be evaluated by listening for a rotational hum that changes pitch with speed and by gently rocking the wheel to detect any play, as slight movement noted three years ago may well have progressed. All four tyres should be inspected for sidewall cracking and uneven shoulder wear, which can indicate suspension misalignment following the recent arm replacement or undiagnosed geometry issues. Given that the vehicle passed its most recent MOT only days after the dangerous failure, a buyer must verify precisely which components were replaced and whether the work was carried out to a satisfactory standard, ideally by reviewing the repair invoices. The CLS platform is also known for oil leaks from the front engine cover area and for cooling system component failures, so a cold-start inspection for any signs of coolant weepage around the radiator, expansion tank, and coolant pipework is advisable, alongside a check of the undertray for oil misting or staining. Any history of the ABC active suspension system warning lights should be questioned, as repairs to this system on the CLS are notoriously costly and the test record alone will not confirm its operational health.