2017 Mercedes-Benz GLA 2.1L Diesel · YF67 ABN

The latest MOT test for this 2017 Mercedes-Benz GLA on 2025-12-23 resulted in a failure due to two major issues: an obviously incorrect offside front headlamp beam projection and persistent advisories regarding both near-side and offside rear brake discs showing significant wear, pitting, or scoring without being seriously weakened. While the previous MOT on 2025-12-23 had passed with only advisories on the brake discs, the failure highlights a recurring problem with rear brake condition and a critical headlamp alignment defect that must be addressed immediately. The earlier passing MOTs in 2024 and 2023, aside from minor advisories like under trays and plate corrections, suggest a generally stable maintenance record, but the recent deterioration indicates either inadequate maintenance or wear progression that requires urgent attention. The presence of advisories on both brake discs in consecutive tests points to a potential underlying issue, such as uneven braking application, suspension misalignment, or brake system degradation over time. The vehicle’s recorded mileage of 85,894 miles at 9 years old represents a moderate annual usage rate of approximately 9,544 miles per year, which is typical for a car of this age and class. This mileage level does not suggest excessive wear from high annual mileage, but it also does not indicate minimal usage either. The consistency of the mileage suggests a steady driving pattern, though the absence of a service history or clear maintenance schedule could mean that consumables like fluids, filters, and wear items may have degraded without timely replacement. Extended periods of standing or infrequent use could exacerbate issues like brake corrosion, fluid degradation, or battery discharge, particularly if the vehicle was not regularly driven to circulate fluids or activate components. The lack of significant mileage spikes does not necessarily mitigate the need for thorough inspection, as age-related wear and calendar-based degradation—such as in brake pads, seals, or electrical systems—can still pose risks. Given the recurring advisories on the rear brake discs and the critical headlamp alignment failure, the prospective buyer should prioritise a thorough inspection of the braking system. The near-side and offside rear brake discs showing pitting or scoring suggest that the pads or linings may have worn unevenly, which could indicate misalignment of the brake calipers, suspension issues causing uneven braking forces, or even warping of the discs themselves. On a test drive, listen for uneven brake pedal travel, clunking or grinding noises from the rear brakes, and check for excessive heat signatures or smoke from the rear wheels. Additionally, inspect the brake fluid level and condition—low or contaminated fluid can exacerbate disc pitting and pad wear. The offside front headlamp beam projection issue is straightforward to address with a proper alignment, but the buyer should confirm that the bulb and wiring are intact and that the vehicle’s headlamp aim is correctly calibrated to prevent visibility hazards. If the brake discs are indeed worn to the point of scoring but not yet to the point of being seriously weakened, a replacement of the pads or linings is recommended to prevent further damage to the discs, which can become brittle and crack over time. For the broader vehicle assessment, the buyer should also focus on the suspension and underbody, as uneven braking and disc wear can be linked to suspension misalignment or damage. Check for signs of suspension bush wear, such as clunking noises when driving over bumps, especially from the rear, and inspect the coil springs for sagging or excessive compression. The presence of under trays fitted during previous MOTs may indicate a lack of proper underbody protection, which could leave the vehicle vulnerable to road debris, corrosion, or minor impacts that could accelerate wear. Given the vehicle’s age and the advisories on the brake discs, it is prudent to verify the condition of the brake system further, including checking for binding calipers, corrosion on the brake discs, or signs of fluid leakage from the brake master cylinder or caliper seals. Additionally, since the vehicle has been driven at a moderate annual rate, the buyer should consider a comprehensive fluid check, including brake fluid, coolant, and transmission fluid, as well as a battery health assessment, particularly if the car has been stored or driven sporadically. Lastly, a visual inspection of the tyre tread depth and sidewall condition is essential, even if the most recent MOT passed due to edge wear advisories, as sidewall damage or cracking from age or low tyre pressure could compromise tyre integrity.