2017 Mercedes-Benz A-Class 1.5L Diesel · LP17 KXG

The most recent MOT test on 2026-03-02 resulted in a failure, with two critical defects—dangerous rear brake pads measuring below the legal minimum thickness of 1.5 mm and a major fault for a non-functional near-side front position lamp. This marks a significant deviation from the previous five MOTs, which were all passed without defects, suggesting either a sudden mechanical issue or a misreporting of existing conditions. The failure highlights a concerning trend in brake system integrity, particularly the rear brakes, which have been flagged as worn thin in prior advisories, indicating progressive wear that has now reached a critical stage. The near-side front position lamp failure, while not directly mechanical, is a straightforward electrical issue that should be addressed promptly to avoid further compliance risks. The vehicle’s recorded mileage of 104,646 miles at the time of this assessment represents a moderate annual usage rate of approximately 11,627 miles, which is consistent with typical long-term ownership patterns for a nine-year-old A-Class. This level of mileage is neither exceptionally high nor low for its age, but it does imply sustained operational use, which can accelerate wear on consumables like brake pads, tyres, and suspension components. The absence of significant mileage gaps suggests the vehicle has been in regular service, potentially contributing to the observed wear patterns in the rear brakes and tyres. However, without additional context on operational conditions—such as frequent stop-and-go driving, which would exacerbate brake wear—it is difficult to pinpoint the exact cause of the recent brake failure, though the historical advisories strongly suggest this is a developing issue that requires immediate attention. Given the recent MOT failure and recurring advisories, the prospective buyer should prioritise a thorough inspection of the braking system, focusing on the rear brake pads and discs. The current condition of the rear pads—measuring below 1.5 mm—demands immediate replacement, as this is a dangerous failure that compromises stopping performance and safety. During a test drive, listen for uneven brake pedal travel, a spongy or soft feel, or excessive vibration, which may indicate warped discs or internal brake issues. Additionally, check for a soft or squishy pedal when applying brakes, which could signal fluid contamination or hydraulic system problems. Inspect the rear brake discs for scoring, glazing, or uneven wear, and verify that the calipers are not binding or seized. If the rear brakes are replaced, ensure the discs are resurfaced or replaced if they show signs of significant warping or corrosion. Beyond the immediate brake concerns, the buyer should also address the near-side rear tyre wear and nail, which were noted in prior MOTs. The tyre’s edge wear suggests directional or uneven loading, which could stem from misaligned wheels, incorrect tyre pressure, or suspension issues. A test drive should include checking for uneven tyre wear patterns, such as cupping or feathering, which may indicate suspension problems like worn coil springs, damaged suspension bushes, or misaligned steering components. Inspect the tyre for the nail embedded in the sidewall, which could lead to a sudden blowout if not removed promptly. While the tyre itself may still be legal in thickness, the nail poses a safety risk and should be addressed immediately. For the front position lamp, a simple visual inspection of the bulb and wiring should confirm functionality, with any electrical issues requiring professional diagnosis. Lastly, given the vehicle’s age and mileage, consider a comprehensive fluid check, including brake fluid (which should be replaced every two years or if contaminated), coolant, and oil, to ensure all time-sensitive fluids are at optimal levels.