2014 Isuzu D-MAX 2.5L Diesel · NA64 UAH

A developing pattern of brake pipe corrosion is the defining mechanical issue on this 2014 Isuzu D-Max, with the most recent test on 2025-12-12 documenting grease-covered corrosion on the near side and off side rear brake pipes, including the front-to-rear sections, following an earlier advisory in 2024 on the same rear pipes and a 2023 advisory on the offside front pipe. Corrosion of this nature on rigid brake lines, particularly when treated with grease or underseal, is commonly a precursor to perforation and hydraulic failure, and the expansion of the affected area from a single front pipe in 2023 to both rear and intermediate pipes by late 2025 indicates a worsening rather than stable trend. The single failure recorded on 2023-11-10 involved a holed backbox causing a major exhaust gas leak, which prevented emissions testing from being completed, alongside a significantly reduced offside front position lamp; these were rectified within four days as the subsequent 2023-11-14 pass shows, but the exhaust integrity remains worth monitoring given the minor rear silencer leak advisory carried forward from 2020. The recorded mileage of 85,211 miles over twelve years equates to an annual accumulation of roughly 7,100 miles, which is broadly typical for a working-class vehicle of this age, and the absence of any multi-year gaps in the testing record suggests the vehicle has been in consistent use rather than laid up. There is no evidence of erratic mileage jumps between tests, with the history reflecting steady, ordinary accumulation rather than tow vehicle, commercial, or prolonged inactivity use. Mechanical implications for a diesel pick-up of this mileage centre on mid-life wear items: suspension components, brake discs and pads, clutch and driveline joints, and the beginning of structural or underbody corrosion, all of which align with the advisories observed on this chassis. For a prospective buyer, the priority areas to physically examine are the brake line runs along the chassis rails and rear axle, looking for flaking, surface rust breaking through underseal, or any dampness indicating active leakage at the flared joints, particularly on the offside front and both rear pipes where advisories have clustered. The front brake discs have been repeatedly flagged as pitted or scored since 2019, so check for a pronounced lip on the disc edge, a pulsing sensation through the brake pedal under firm application, and any grinding or squeal under light braking. The offside front suspension arm ball joint noted with slight play in 2024 should be checked by rocking the wheel at the top and bottom with the vehicle on axle stands or by listening for clonks over speed humps and uneven surfaces. Finally, inspect the exhaust backbox and rear silencer for blue soot staining around joints or hangers indicative of further perforation, and confirm that the front position lamps deliver equal, bright output, as the 2023 reduction in intensity may recur. A thorough test drive should also include firm application of the brakes from speed to confirm a firm pedal without excessive travel, and a check of the rear load area and chassis for surface corrosion that could soon migrate to structural components.