2018 BMW 420 2.0L Diesel · AF68 HME

A clear pattern of brake and rear-tyre wear emerges from the MOT history of this 2018 BMW 420, with each of the three most recent tests flagging some form of issue centred on the rear axle. The 2025 test, conducted on 8 September, passed but recorded three advisories: a nearside rear tyre worn close to the legal limit and on its edge, a nearside rear tyre showing slight damage, cracking or perishing, and a rear brake imbalance where the service brake requirements were only just met, suggesting adjustment or repair is required. This follows a 2024 advisory for a nearside rear tyre worn close to the legal limit, and an earlier 2021 advisory noting rear brake pads wearing thin. The earlier tests in 2022 and 2023 returned clean passes with no advisories at all, indicating that the deterioration is a relatively recent development rather than a long-standing trait. Taken together, the advisories point to a recurring rear-end wear pattern that warrants close physical inspection rather than dismissal as routine consumption. With 70,837 miles accumulated over eight years, the vehicle averages roughly 8,855 miles per year, which sits comfortably within typical usage parameters for a car of this age and class. There are no extended gaps between annual tests, suggesting the vehicle has remained in continuous road use rather than being laid up for long periods, which is mechanically favourable for preserving component integrity, particularly in the braking system, suspension, and underbody components. The mileage progression between tests is steady and there is no evidence of any anomalous spike or unusual accumulation that might indicate hard use, towing, or track-style driving. The consistent annual testing cadence, combined with broadly average mileage, means the wear items now surfacing are likely genuine service-interval replacements rather than symptoms of unusual duty cycles. For a prospective buyer, the immediate priority on inspection is the rear braking system. With two advisories three years apart flagging pad wear and a 2025 advisory highlighting a brake imbalance where requirements were only just met, the brake caliper guides, handbrake mechanism, and rear disc condition should be examined closely. Look for uneven pad deposition across the rear axle, any binding caliper symptoms such as the rear wheels feeling hotter than the fronts after a drive, or a pulling sensation under light braking. On a test drive, listen for any squeal, grinding, or judder through the pedal, and confirm that the handbrake holds the vehicle securely on an incline, as rear brake imbalance on a BMW of this era is frequently linked to handbrake shoes or caliper slide pins rather than purely pad wear. The rear tyres also merit careful attention, given that the nearside rear has been flagged for edge wear in two consecutive tests. Edge wear on the inside or outside shoulder is often a symptom of rear wheel alignment geometry, potentially a worn rear trailing arm bush, a sagging rear coil spring, or a subtle tracking issue. On a test drive, pay attention to any slight drift or pulling at motorway speeds, and check for uneven ride height at the rear. Inspect the sidewalls of all four tyres for the cracking and perishing noted in 2025, as this type of deterioration on a BMW is often linked to age-hardened rubber rather than mileage, and replacement of all four tyres is advisable if any show similar deterioration. Beyond these flagged items, a general inspection of the front suspension arms, drop links, and underbody corrosion — particularly around the rear subframe mounting points — would round out a thorough appraisal.