2006 Audi A6 2.0L Diesel · AF06 CWE

A pattern of chronic brake disc wear and advancing underbody corrosion defines the mechanical outlook for this twenty-year-old Audi A6, with every MOT since 2022 flagging pitted or scored brake discs across both axles. While none of these advisories have yet been classified as seriously weakened, the consistency of the finding across four consecutive tests suggests the discs have reached a stage where surface measurement on a test drive is essential. The 2025 pass on 23 September noted brake wear on all four corners alongside a slight play in the offside front anti-roll bar linkage ball joint, a component that warrants close attention as further deterioration will compromise both ride quality and handling response. Two failures are recorded across the seven-year history: a dangerous offside front tyre bulge in September 2023 caused by structural separation, and a loose offside rear road wheel fixing in September 2024, both of which were rectified for the subsequent retest or later test. The persistence of suspension corrosion advisories, first noted in 2022 and upgraded to a general all-components corroded age-related note in 2023, points to a chassis that is steadily succumbing to surface oxidation, which is typical of a vehicle of this vintage and should be inspected thoroughly for any progression toward subframe integrity. At 108,036 miles against a 2006 registration, this A6 has covered an average of roughly 5,400 miles per year, a notably low annual accumulation that reflects either limited daily use or extended periods of standing. The MOT record shows tests conducted annually from 2021 through 2025 with no obvious gaps, indicating the vehicle has remained on the road throughout this period despite the modest mileage. A low-mileage vehicle of this age presents particular mechanical considerations, as ageing rubber components, brake hydraulic seals, and suspension bushes deteriorate through time and exposure rather than purely through use. The fact that brake discs have worn to a pitted and scored condition across all four corners despite the low mileage points to corrosion from infrequent rather than frictional wear, reinforcing the likelihood of prolonged standing periods between uses. Tyre advisories have appeared in three of the last four tests, including cracking, perishing, and edge wear down to 1mm, which is consistent with ageing rubber that has hardened beyond its service life. For a prospective buyer, the immediate priority is a close inspection of the braking system, particularly measuring remaining disc thickness on all four corners and checking the rear discs against the pitted condition flagged in 2024. Brake pedal feel should be assessed for sponginess or excessive travel, and any binding or juddering under light application would confirm the advisories are maturing into a more serious concern. The anti-roll bar linkage ball joint play noted in 2025 should be checked by hand for free movement beyond the joint boot, and the condition of both front and rear anti-roll bar drop links and bushes warrants examination as these are common failure items on C6 platform Audis of this age. Suspension components more broadly should be inspected for corrosion progression, with particular attention to the rear axle beam, trailing arms, and mounting points where rust can compromise structural integrity over time. During a test drive, listen for clonking or knocking noises from the front suspension over uneven surfaces, particularly from the offside where the anti-roll bar linkage play has been recorded, and feel for any vagueness or rattle through the steering wheel that could indicate worn top mounts or drop link deterioration. Tyre condition should be scrutinised for perishing, cracking in the sidewalls, and uneven shoulder wear, given the repeated advisories across multiple tests, and any bulges or deformations should be treated as an immediate safety concern. Underneath the vehicle, a thorough check for rust scale on the subframe, brake pipe corrosion, and exhaust mounting points is advisable, as the ongoing suspension corrosion advisories suggest the underbody protection may be compromised. Finally, given the low annual mileage, the battery, coolant, brake fluid, and drive belts should be assessed for age-related deterioration rather than purely functional condition, as these items degrade through time irrespective of use.