2015 BMW 520 2.0L Diesel · KL05 AEJ

A pattern of front-end steering and braking wear is the defining mechanical story behind this 2015 BMW 520, evidenced by advisories at successive MOT tests on both track rod ends and brake discs, alongside a more serious shock absorber fluid leak that contributed to a fail in early 2024. The most recent test on 10 February 2026 returned a pass, but the front brake discs were flagged as worn though not yet excessive, continuing the trend of front-end component degradation that first surfaced with a slight play in the nearside track rod end ball joint recorded on 30 January 2025. The intervening period contained an outright fail on 6 February 2024, where an offside rear shock absorber was found to have a serious fluid leak and the rear tyres were of mismatching sizes fitted to the same axle. A clean pass three days later on 9 February 2024 confirms the immediate defects were rectified, and the subsequent 2025 and 2026 tests show the car back inside legal limits, but the underlying advisories reveal components now approaching the threshold where replacement is imminent rather than optional. With 151,378 miles recorded across an 11-year lifespan, this vehicle is averaging around 13,762 miles per year, a figure that places it firmly in the higher-mileage bracket for its age and points to sustained, regular use rather than extended periods off the road. Annual MOT coverage appears consistent year on year from 2023 to 2026, with no extended testing gaps that would suggest long-term standing, so the recorded mileage is likely a fair reflection of true accumulation rather than under-recorded use. Mechanically, this usage profile typically accelerates wear on suspension bushes, control arms, brake discs and pads, clutch assemblies, and turbocharger-related components on diesel variants, meaning consumable replacement cycles will be shorter than on a lower-mileage equivalent. A prospective buyer should focus their pre-purchase inspection squarely on the front suspension and steering geometry that the MOT history has repeatedly flagged. The track rod end ball joint play recorded in 2025 should be checked by hand on a test drive: lift the front wheels off the ground if possible and attempt to rock each tyre laterally and vertically, listening for clonks or feeling for slack, and during a road test listen for any knocking through the steering over uneven surfaces that may indicate worn inner or outer tie rods. The 2026 advisory on both front brake discs warrants a careful feel-test during braking, with the buyer paying particular attention to any steering wheel vibration, judder through the pedal under heavy application, or pulsing that would suggest the discs are now past their serviceable thickness; the wear rate between this advisory and a future test should be considered, and a measurement with a micrometer if accessible would clarify remaining material. The rear shock absorber fluid leak that caused the 2024 fail is another area requiring confirmation that the repair was thorough, as shock absorbers are typically replaced in pairs to maintain balanced damping. On a road test, the buyer should carry out multiple consecutive compressions over speed bumps or undulating B-roads, noting whether the rear settles unevenly, exhibits a continuing bounce after a compression cycle, or allows the body to wallow through corners, any of which could indicate that the replacement units are themselves failing or that related rear coil springs and top mounts have been compromised. Finally, the rear tyre size mismatch flagged at the same 2024 failure should be verified by physically inspecting both rear sidewalls to confirm matching size, load rating and speed index, as a repeated mismatch would suggest an underlying wheel, hub or diff ratio discrepancy and would itself constitute an immediate failure on any future MOT.