2003 Peugeot 406 2.0L Diesel · KX52 DLF

The defining mechanical story of this 2003 Peugeot 406 centres on a deteriorating rear structure combined with persistent rear brake irregularities. The 2026 test on 9 June produced a pass, but with an advisory noting the nearside rear service brake binding, a finding that has now recurred across three separate tests in 2023, 2025 and 2026, which indicates an unresolved caliper or mechanism issue rather than a one-off observation. More concerning is the structural pattern: the 2024 test recorded chassis corrosion within 30cm of mounting points on both rear sills, and by 2025 this had advanced to a fail with major defects citing excessive corrosion at the suspension component mounting areas on both inner sills significantly reducing structural strength. The 2026 pass suggests remedial welding or reinforcement was carried out between tests, but a buyer must verify the quality and extent of any repair work, as corrosion of this nature in prescribed structural areas tends to progress once initiated and may recur on adjacent panels. Mileage accumulation stands at 141,087 miles across approximately 23 years, equating to roughly 6,134 miles annually, which is broadly typical for the vehicle's age and suggests consistent rather than intensive use. There are no extended gaps in the testing record that would imply long periods off the road, with annual tests consistently recorded from 2021 onwards, indicating the vehicle has been in regular service. At this mileage and age, wear-related deterioration of consumables, suspension bushes, drivetrain mounts and flexible components is expected, and the recorded brake and corrosion advisories are consistent with a car that has accumulated significant road use over two decades rather than any unusual operational profile. For a prospective buyer, the priority inspection areas are the rear inner sills and suspension mounting points, where corrosion has now been flagged at three consecutive tests. The structural repair evident between the 2025 fail and 2026 pass should be physically examined for quality of welding, presence of underseal or cavity wax treatment, and any signs of fresh corrosion spreading from the repaired zones, as well as checked against the original body around the jacking points, rear chassis legs and wheel arch lips. The persistent nearside rear brake binding warrants a test drive with attention to whether the vehicle pulls to one side under firm braking, whether the nearside rear disc becomes significantly hotter than the offside after driving, and whether the handbrake holds the car on an incline without creeping. A binding caliper slider, seized handbrake mechanism or distorted brake disc could all be contributing, and a rolling road or visual inspection of the caliper carriers and pad wear patterns would clarify the root cause. Additional checks should include a thorough inspection for oil leaks, as a non-excessive leak was noted in 2023 and the shock absorber misting flagged in 2022 may have progressed; on a test drive listen for clonking or knocking over uneven surfaces, which would indicate worn rear suspension bushes or top mounts stressed by the structural corrosion. The rear shock absorbers themselves should be examined for weeping, and the tyres inspected for uneven inner-edge wear, which would suggest the binding brake has been dragging unevenly. Given the 2022 dangerous failure for an exposed-cord tyre and the historical stop lamp defect, verify all rear lighting functions and check the spare tyre condition, as the recorded history demonstrates electrical and tyre-related issues have already presented on this vehicle.