2012 Mitsubishi ASX 1.8L Diesel · PL08 JAX

The most recent MOT, dated 29 August 2025, was passed but recorded a series of advisories concerning corrosion of all four brake pipes and mild front sub‑frame corrosion. Over the preceding five years the vehicle has moved from a clean pass in 2020 to two outright failures in 2021 (rear brake discs) and 2023 (service and parking brake efficiency), with a pattern of recurring brake‑related wear and progressive under‑body corrosion. Although the latest test was successful, the cumulative record indicates a maintenance trend that is deteriorating rather than stabilising, with several critical systems having required remedial work in the last three years. At 103,226 mi the 2012 ASX averages roughly 7,300 mi per annum, which sits comfortably within the UK average for a vehicle of this age. The mileage does not suggest excessive use, but the intermittent nature of the MOT failures hints at periods of low utilisation or prolonged storage, which can exacerbate corrosion and fluid degradation. The relatively modest annual distance means that wear on major power‑train components such as the engine and transmission is likely to be moderate, yet the brake system and under‑body have suffered from age‑related deterioration that is not solely mileage‑driven. Prospective buyers should give the brake system the highest priority. The corrosion on the front and rear brake pipes, noted in the latest advisory, can lead to fluid leaks, reduced hydraulic pressure and spongy pedal feel; a visual inspection for rust, pitting or greased‑over pipe sections is essential, and replacement of the affected pipes is advisable. Both front and rear brake discs have been flagged repeatedly for pitting and scoring and were deemed significantly worn in 2021; given the age of the discs, replacement of the rear set is likely imminent and the front set should be measured for thickness and surface condition. Verify that the service brake lever offers firm, progressive pedal travel and that the parking brake holds the vehicle firmly without excessive lever travel – any soft or inconsistent feel may indicate air in the system, worn pads, or a need for handbrake cable adjustment. During a test drive listen for any pulsation or shudder when applying the brakes, especially under moderate braking, and watch for uneven pad wear or disc run‑out. In addition to the brakes, the under‑body corrosion noted in several MOTs warrants a thorough visual examination of the front and rear sub‑frames for any deep rust pits, especially around mounting points for suspension components and the exhaust system, which was also reported as corroding in 2022. Inspect the off‑side front tyre for tread wear close to the legal limit and check all tyres for sidewall cracking that can arise from age rather than mileage. Verify the condition of the 12 V battery, as a vehicle of this vintage often suffers from sulfation if left standing for long periods; a load test will confirm its capacity. Finally, confirm that all fluids – brake, coolant, engine oil and transmission oil – have been changed in accordance with the manufacturer’s calendar intervals, and that the service book shows regular maintenance stamps, as time‑based fluid degradation can precipitate the types of brake efficiency failures already recorded.