2016 Citroen C4 1.6L Diesel · CK16 OCO

A chronic pattern of rear brake pad wear is the defining mechanical theme of this C4's MOT history, with the same advisory appearing at every test between 2023 and 2025 before escalating into a dangerous failure on 27 April 2026 when the pads were recorded as below 1.5 mm. This is not a single isolated finding but a four-year downward trend that was either ignored or not addressed between tests, culminating in a rear tyre structure failure at the same examination due to what appears to be related neglect. The same April 2026 visit also produced a major defect for excessive play in the offside track rod end ball joint, a steering component failure that would itself have warranted immediate attention. Just five days later, on 22 April, the vehicle was retested and passed with a clean bill of health, indicating that the brake pads, tyre, and track rod end were all replaced or rectified within that short window. A second dangerous failure occurred back in February 2022 for both front tyres being below the legal 1.6 mm tread depth, demonstrating that tyre condition has been an issue on more than one occasion across the vehicle's life. At roughly 4,124 miles per year over a ten-year span, this C4 has covered unusually low mileage for its age, and the recorded tests show the typical clustering of annual MOTs with no extended gaps in road use. The annual mileages implied between tests appear broadly consistent, suggesting regular if light use rather than long periods of standing. Low annual mileage of this nature means that wear-related components such as brake discs, suspension bushes, and drivetrain mounts may have aged through time and environmental exposure rather than through heavy use, which can lead to corrosion seizing, dried rubber, and surface oxidation even where mileage-driven wear is minimal. The fact that brake pad advisories recurred despite the low annual mileage is consistent with short-trip urban use, where brakes do most of their work and pads can wear at a disproportionate rate compared to engine and transmission components. For a prospective buyer, the most pressing area to inspect is the braking system, particularly the rear calipers and discs. The advisories repeatedly flagged rear pad wear, which can indicate either a binding rear caliper failing to retract fully, a stuck handbrake mechanism, or simply the natural wear rate of this model. On a test drive, listen for any scraping or grinding from the rear corners, check for the rear wheels dragging after release of the handbrake, and feel for pulling to one side under braking. The track rod end replacement noted at the April 2026 retest should be checked by rocking the front wheels side to side with the car raised to detect any residual play, and the steering should be assessed for any vagueness or knocking over uneven surfaces that might suggest the replacement was not properly torqued or that other steering or suspension linkage components are also worn. Given the two dangerous tyre failures recorded across the vehicle's life, a close inspection of all four current tyres is essential, looking for uneven shoulder wear, cracking, bulges, or any signs of ageing rubber that would warrant replacement regardless of remaining tread. The front brake pad advisory from 2023 alongside the recurring rear advisories suggests the front pads will also be approaching a change interval soon, so a physical check of pad thickness through the wheel is worthwhile. Finally, because the mileage is low and the model is now ten years old, particular attention should be paid to age-related deterioration items not covered in the MOT record such as the condition of coolant and brake fluid, the state of rubber suspension bushes, any fluid leaks from the engine or transmission, and the condition of the exhaust system for corrosion. A test drive should include firm braking from speed to confirm straight-line stability, slow-speed manoeuvring to detect any clonks from the front suspension, and listening for any timing chain or auxiliary drive noise on a cold start.