2017 Hyundai Ioniq 1.6L Hybrid electric · RO67 UTK

A persistent pattern of rear brake disc wear is the defining mechanical thread running through this Ioniq's MOT history, with the same nearside and offside rear disc pitting advisories recurring on both the 2024-11-01 and 2025-10-08 tests. This duplication across consecutive annual examinations indicates the discs have been degrading gradually rather than suffering a single acute event, and given that the issue is identical on both rear corners, it points to either the natural consequence of low-mileage corrosion setting into the disc surfaces or a caliper mechanism that is not retracting fully and is keeping the pads in light contact with the discs. The vehicle passed both tests with no failures, but the fact that the rear discs were already showing measurable surface degradation at around 35,000 miles and have not yet been replaced is a clear signal that the braking components are approaching a service threshold. The rest of the record is otherwise clean, with the 2023 and 2021 tests returning no advisories at all, and the only other flagged items being a full set of four tyre perishing advisories back in October 2022 which appear to have been resolved through replacement. The mileage profile of this nine-year-old vehicle is notably light, averaging roughly 3,950 miles per year, which is well below typical usage for a car of this age. There are no gaps in the MOT testing record, suggesting continuous road use rather than long periods of storage, but the low annual accumulation means many consumable and rubber components will be ageing through calendar time rather than wear distance. The 2022 tyre perishing advisories across all four corners are a textbook example of this phenomenon, where tyres degrade from UV exposure and ozone rather than tread wear, and similarly the pitted rear brake discs are consistent with surface corrosion developing on discs that are used infrequently and not subjected to the regular high-temperature bedding cycles that keep them clear. Mechanically, this usage pattern tends to preserve the powertrain, clutch, and major suspension components, but it places greater stress on items that suffer from inactivity, including brake discs, brake caliper sliders, rubber boots and gaiters, drive shaft CV joints, and the 12V auxiliary battery. For a prospective buyer, the immediate priority on inspection is the condition and likely replacement cost of the rear brake discs and pads, which should be examined physically by removing a wheel or, at minimum, viewed through the spokes with a torch to assess both disc thickness and the depth of any corrosion pitting. On the test drive, listen carefully for any scraping or metallic noise from the rear when first pulling away, and check for a binding sensation by rolling the car in neutral on level ground to feel whether one rear wheel drags more than the other, which would indicate a seized caliper piston or slider. Brake pedal feel should be firm and progressive with no judder under light or heavy application, as rear disc runout caused by uneven corrosion can transmit through to the pedal, particularly through the regenerative braking system that the Ioniq uses. The front discs and pads have not been flagged in any test and should be visually checked for comparable wear, although they tend to last considerably longer on this model given the regenerative braking bias toward the front axle. Beyond the braking system, attention should be paid to the rubber suspension and drivetrain components that suffer disproportionately on low-mileage vehicles, including the anti-roll bar bushes, lower control arm bushes, and the CV joint boots on both sides, any of which can crack or perish from underuse and then fail suddenly when the car is driven more regularly. The exhaust system, including the mounting rubbers and the heat shields, should be inspected for surface corrosion and any rattling on start-up, as a car of this age with light usage is still susceptible to exhaust mount deterioration. Given the clean record between 2021 and 2025 apart from the brake and tyre items, there is no evidence of structural corrosion, fluid leaks, or suspension component failure, which supports the overall roadworthiness of the vehicle, but a buyer should negotiate the cost of replacing the rear brake discs and pads into any offer, as this work appears imminent based on two consecutive years of recorded surface degradation.