2015 Audi A4 4.2L Petrol · RS04 AGE

A pattern of escalating safety defects defines the MOT trajectory of this 2015 Audi A4, with three failures recorded across the past four testing cycles, two of which carried dangerous categorisations. The most recent examination on 20 March 2026 resulted in a pass only after the vehicle had failed the previous day on a dangerous leaking front brake pipe and a dangerous offside rear tyre exposing ply or cords. Going back further, the 2025 test saw a repeat failure for inoperative headlamp cleaning devices and deteriorated rear-most lower suspension arm ball joint dust covers on both front sides, while the 2024 cycle produced a dangerous fractured offside front road wheel. Although three of the seven recorded tests passed without advisories, the chronological pattern shows mechanical deterioration accelerating from 2024 onwards rather than stabilising. Annual mileage of roughly 12,274 miles is above the typical accumulation rate for an eleven-year-old vehicle, and this usage profile carries direct mechanical implications. Higher mileage correlates with accelerated wear on suspension components, brake friction material, tyres, and drivetrain items, particularly when combined with the multi-year MOT gap between 2023 and 2024 where the vehicle appears to have covered substantial distance without statutory testing. The recurrence of front suspension and brake line defects across consecutive cycles is consistent with a chassis that has accumulated significant road loading, and the recent dangerous brake pipe failure suggests hydraulic system corrosion or fatigue has progressed to a point where pipe replacement is no longer a precautionary measure but an immediate necessity. Given the documented suspension defects, a prospective buyer should focus on the front lower control arms and their rearmost ball joints during a physical inspection. On a test drive, listen for clonking or knocking noises from the front suspension over speed humps and uneven road surfaces, particularly under braking or when turning into a driveway at low speed, as worn ball joints frequently manifest as a dull thud or metallic rattle. Check for uneven or accelerated inner-edge tyre wear, which is a classic symptom of compromised suspension geometry, and have the rear-most bushes and joints physically levered by a technician to assess play. Any perceptible movement at the ball joint under hand pressure would warrant immediate replacement of both sides. The brake system history demands particular attention, with two dangerous defects recorded against brake-related components in the most recent cycle alone. The offside front brake pipe leak identified on 19 March 2026 suggests either advanced corrosion of the steel hydraulic lines or mechanical damage from road debris, and the brake pipe run along the underside should be inspected for rust scaling, flaking, or damp residue before purchase. During a road test, press the brake pedal firmly several times from cold to detect any sponginess or sinking travel that could indicate remaining air ingress or a weeping seal. Additionally, the headlamp cleaning device failure recorded in 2025 should be verified as rectified, and the front shock absorbers, which carry a persistent advisory for light oil misting on the offside unit from 2025, should be checked for any worsening seepage, as continued misting typically progresses to a full hydraulic failure over time.