2020 MG ZS 1.0L Petrol · SL02 THL

The latest MOT test on the 2020 MG ZS recorded a passing result on 2026-06-24, following a previous failure in 2026-06-22 that highlighted critical issues with the offside rear suspension arm bush and a missing top bolt on the offside rear brake calliper. While the 2025 and 2024 MOTs were clean, the presence of recurring advisories and major defects in the past two years suggests a pattern of wear and maintenance oversight rather than a stable condition. The offside rear brake disc pitting noted in both 2026 tests indicates ongoing friction between the disc and pad, which could lead to further surface damage or even warping if left unaddressed, potentially compromising braking performance. The suspension arm pin or bush failure in 2026-06-22 points to significant wear in the suspension system, likely exacerbated by prolonged standing or heavy cornering, and requires immediate attention to prevent further structural compromise or alignment issues. The vehicle’s recorded mileage of 22,007 miles at the time of this assessment represents a relatively low annual usage rate of approximately 3,668 miles per year, which is unusually low for a six-year-old car, particularly one of MG’s more active models. Such low mileage often reflects periods of prolonged inactivity, which can accelerate wear in components that are subject to static stress, such as brake systems, suspension bushes, and drivetrain mounts. The offside rear brake calliper’s insecure mounting in 2026-06-22, exacerbated by the missing bolt, is a prime example—standing the vehicle can cause calipers to bind or leak hydraulic fluid, leading to uneven brake pad wear or even a complete failure. Similarly, the suspension arm bush failure suggests that the car was either parked in a way that stressed the suspension or driven in conditions that accelerated wear, such as rough roads or frequent braking. For the prospective buyer, the most critical immediate actions should focus on the suspension and brake systems. Prioritise a thorough inspection of the offside rear suspension arm and bush, replacing the worn component to prevent further misalignment or lateral movement that could damage steering components or exacerbate tyre wear. The missing top bolt on the offside rear brake calliper must be replaced, and the calliper should be checked for hydraulic leaks or binding, which could manifest as a spongy pedal feel or uneven braking on the offside rear. Listen for any unusual noises during a test drive—clunks or rattles from the suspension, especially when cornering or over bumps, will confirm the bush replacement’s necessity. Additionally, verify that the brake discs are not warped or excessively pitted, as this could lead to reduced braking efficiency or require pad replacement sooner. Beyond the immediate defects, the buyer should conduct a comprehensive physical inspection of the vehicle’s standing condition. Check for signs of corrosion on the offside rear wheel arch, brake components, and suspension mounts, as prolonged exposure to moisture can accelerate rusting, particularly in the brake system where corrosion can compromise disc and caliper functionality. Inspect the tyres for sidewall perishing, which can occur even at low mileage due to age-related degradation, and ensure the tread depth meets legal requirements. Given the low annual mileage, the engine oil and transmission fluid should be checked for calendar-based servicing, as these fluids degrade over time regardless of usage. Finally, test the 12V battery’s charge capacity and connections, as standing vehicles can lead to battery drain or corrosion in terminals, which may not be apparent during low-mileage operation. A full service history check, if available, would also be valuable to confirm whether scheduled maintenance, such as valve adjustments or spark plug replacements, has been attended to.