2014 Mercedes-Benz B-Class 1.5L Diesel · SB51 AND

Corrosion of the braking system components represents the primary mechanical risk for this vehicle, following a significant failure in December 2025. While the most recent test on 10 December 2025 resulted in a pass, the record shows a progression from a dangerous failure involving an excessively corroded nearside rear outer brake hose ferrule and major failures for excessively corroded nearside and offside rear brake pipes, to current advisories regarding corrosion on both front brake pipes. This indicates that while the most critical structural failures of the hydraulic lines were addressed to secure the pass, the underlying issue of pipe degradation remains present and requires monitoring. The vehicle has covered 69,101 miles over its twelve-year lifespan, which equates to an average annual accumulation of approximately 5,758 miles. This represents a lower-than-average usage pattern for a 2014 Mercedes-Benz B-Class. Mechanically, such low annual mileage can sometimes correlate with less frequent operation of moving components, though the MOT history does not show any multi-year gaps in testing that would suggest long periods of stationary storage. The recorded mileage means that while drivetrain wear may be lower than a high-mileage equivalent, components such as rubber hoses and brake lines are subject to age-related degradation regardless of distance travelled. Prospective buyers should focus heavily on the integrity of the braking system during a physical inspection. Given the history of corrosion on the brake pipes and the previous failure of a brake hose ferrule, it is essential to inspect the condition of the hydraulic lines for any signs of weeping fluid or advanced surface oxidation. On a test drive, pay close attention to the brake pedal feel; any sponginess, inconsistent pressure, or a pulling sensation to one side could indicate air in the system or uneven pressure caused by the previously noted 32% brake imbalance. Additionally, ensure the braking action is smooth and free from any pulsation or judder that might suggest issues with the discs or calipers. Other areas requiring attention include the windscreen wipers and tyre wear. The record shows a failure in late 2024 regarding ineffective wiper performance and recurring advisories for front tyres being worn close to the legal limit or worn on the edges. During the test drive, check that the wipers clear the glass without streaking or skipping, as this can impact visibility in poor weather. Observe the front tyres for uneven tread wear patterns, which can be an indicator of underlying suspension geometry issues or incorrect tyre pressures. The combination of these factors suggests that while the vehicle is currently roadworthy, the braking system and consumables require close scrutiny.