2020 Mercedes-Benz A 1.5L Diesel · WN70 MFV

A clear pattern of rear brake wear dominates the mechanical history of this 2020 Mercedes-Benz A-Class, with the most recent MOT on 7 November 2025 returning a clean pass, but the underlying record showing a dangerous failure at the rear brake pads just thirteen days before the October 2024 pass. Both near-side and off-side rear pads were recorded as less than 1.5 mm thick, placing them well below the service limit and technically rendering the vehicle unsafe to drive at the time of test. An advisory issued at the October 2023 test noted the front brake pads were already wearing thin, demonstrating that pad wear has been flagged consistently across the three most recent tests. The fact that the vehicle subsequently passed without any further brake-related advisories suggests either immediate replacement of the rear pads or full brake system attention, though a prospective buyer should treat this as evidence that the braking system demands ongoing scrutiny rather than a resolved issue. With 61,999 miles recorded over six years, annual usage equates to approximately 10,333 miles per year, which sits squarely within typical parameters for a car of this age and class. There are no extended gaps between MOT tests indicating long periods off the road, and the mileage accumulation appears steady, suggesting regular rather than intermittent use. For a Mercedes-Benz A-Class at this mileage point, the principal mechanical implications relate to mid-life wear on consumables and suspension components rather than major drivetrain concerns, but the consistent brake wear pattern confirms that this particular vehicle is operating at a usage level where pad and disc replacement intervals are being reached on a roughly annual basis. Given the documented rear brake pad failure, the most important pre-purchase inspection should focus on the entire braking system, not only pad thickness. The discs on both rear corners should be examined for lipping, scoring, and minimum thickness, as worn pads that ran down to 1.5 mm will typically have caused accelerated disc wear. The rear calipers should be checked for binding or seizing pistons, since uneven pad wear across both rear wheels simultaneously can point to caliper slide pin issues. On a road test, any pulling to one side under braking, a soft or spongy pedal, or juddering through the brake pedal would warrant immediate investigation, as would any warning messages relating to the electronic parking brake, which on rear-disc Mercedes applications can stick or fail to release fully. Beyond the braking system, the front brake advisory from 2023 indicates that pad replacement history on the front axle should be verified, and the discs inspected for hot spots or warping. A thorough test drive should include driving over uneven road surfaces and speed bumps at low speed to listen for clonks or knocks from the front suspension, paying particular attention to the lower wishbones, anti-roll bar links, and top mounts, which are known wear items on A-Class models of this generation. The steering should be checked for any vagueness, knocking through the rack, or uneven tyre wear on the inside shoulders, as these can indicate worn suspension bushes or tracking misalignment. Finally, a visual inspection underneath the vehicle for any signs of corrosion on the rear subframe mounting points, brake pipes, and fuel lines is advisable, given the vehicle's age and exposure to UK road conditions, and a diagnostic scan for any stored fault codes within the brake, ABS, and ESP systems would provide additional reassurance given the recent dangerous defect history.