2018 Mercedes-Benz A-Class 1.5L Diesel · RO68 WKA

The most recent MOT test on the 2018 Mercedes-Benz A-Class was conducted on 2025-09-19 and resulted in a clean pass, marking a positive turnaround from the previous failures and advisories observed in March 2025. However, the vehicle’s MOT history reveals a pattern of recurring issues, particularly concerning the front constant velocity (CV) joints and brake components, which were flagged as severely deteriorated or critically worn in multiple tests. The failure in March 2025, where the rear brake pads were found to be dangerously thin below the 1.5 mm legal minimum, indicates a serious wear concern that must be addressed promptly, as this poses a significant safety risk. While the latest test shows no defects, the history suggests that the vehicle has not yet reached a stable maintenance baseline and that proactive intervention is required to prevent further degradation of critical systems. The recorded mileage of 99,457 miles for a vehicle aged eight years represents a high annual usage rate of approximately 12,432 miles per year, which is notably elevated for its age. Such mileage accumulation typically accelerates wear on consumables like brake pads, CV joints, and suspension components, as well as on internal engine and transmission elements. The absence of significant mileage gaps—particularly in the last four years—suggests consistent, heavy usage, which can exacerbate issues such as uneven tyre wear patterns, accelerated brake pad and disc erosion, and premature failure of seals and gaskets in the drivetrain and suspension. The CV joints, which were repeatedly cited as severely deteriorated, are particularly vulnerable to this wear regime, as their constant motion and exposure to road debris can lead to rapid boot degradation and joint failure over time. For the prospective buyer, the most urgent concerns stem from the recurring CV joint and brake advisories. The CV boots, which seal the joints to prevent contamination and lubricant loss, must be inspected for complete failure, as a ruptured boot will lead to joint seizure, which can cause sudden wheel spin or loss of control. On a test drive, listen for a grinding or clicking noise from the front wheels during acceleration or cornering, which would indicate a failing CV joint. Additionally, check for uneven tyre wear, particularly on the offside front tyres, which were already nearing legal limits in previous tests. The brake system, especially the rear pads, must be addressed immediately, as their dangerously thin condition poses a direct safety hazard. Inspect the brake discs for corrosion, warping, or binding, and listen for a grinding sound when applying the brakes, which could signal metal-to-metal contact if pads are too thin. Beyond the immediate concerns, the vehicle’s age and high mileage warrant a thorough physical inspection for signs of long-term wear and potential structural or fluid-related issues. Given the extended period of use, check the tyre sidewalls for signs of perishing or cracking, which can compromise their structural integrity and lead to blowouts. Inspect the 12-volt battery for signs of corrosion around terminals and cables, and test its charge capacity, as older batteries in high-mileage vehicles are prone to failure. The brake fluid should be replaced every two years, regardless of the MOT advisory, as age can cause it to absorb moisture and become corrosive to brake components. Additionally, verify that the service book records reflect any scheduled maintenance, such as oil changes, suspension inspections, and exhaust emissions checks, as these are critical for maintaining roadworthiness and preventing future failures. Finally, consider a professional inspection of the exhaust system for leaks or excessive noise, as high mileage can lead to wear in the catalytic converter and mufflers.