2007 BMW Z4 2.5L Petrol · KJ07 DWZ

A persistent weakness in the rear brake pipe corrosion dominates this Z4’s MOT record, with both rear pipe sections flagged as excessively corroded in a 2025 failure and repeatedly noted as corroded and greased in earlier advisories. The off‑side front upper anti‑roll bar linkage dust cover also failed to keep dirt out in the same 2025 test, indicating a potential entry point for moisture and debris around the suspension. Despite those major failures, the most recent MOT on 6 August 2026 recorded a clean pass with no defects, suggesting that the required remedial work was carried out and the vehicle now meets the statutory safety standards. At 109 445 miles on a 2007 model the average annual mileage works out to roughly 5 800 mi, well below the typical UK usage pattern for a car of this age. The relatively low cumulative mileage reduces the overall wear exposure on engine and drivetrain components, yet the MOT history shows that even low‑mileage cars can develop localized corrosion, particularly on brake pipe fittings that are exposed to road salt and moisture. No significant mileage spikes or testing gaps appear in the five recorded tests, indicating consistent usage rather than periods of prolonged storage that might have exacerbated rust formation. For a prospective buyer the priority should be a thorough inspection of the rear brake pipe assemblies. Look for any signs of external rust, pitting, or leaking fluid around the pipe joints, and verify that the protective greasing observed in earlier advisories has been removed and the pipes are clean and secure. During a road test, listen for metallic squeal or hissing on braking, feel for any soft or spongy pedal feel that could betray internal pipe degradation, and check that the brakes apply evenly without pulling to one side, which could indicate lingering corrosion affecting the hydraulic balance. The front upper anti‑roll bar linkage dust cover should be examined for integrity; a damaged or missing cover can allow grit to infiltrate the ball joint, potentially leading to premature wear or noisy steering. While the front brake disc was noted as pitted but not seriously weakened, a visual inspection for deep scoring and a test‑drive brake pedal feel for judder will confirm whether the discs are still within safe limits. Given the recent clean MOT, the vehicle appears roadworthy, but confirming the condition of the rear brake pipes, anti‑roll bar dust cover, and brake discs before purchase will mitigate the risk of recurring corrosion‑related failures.