2015 Scania G450 Heavy oil · AX15 RTX

The most recent MOT test on 2026-08-20 resulted in a clean pass, indicating no active roadworthiness defects at that time. However, the vehicle’s MOT history reveals a pattern of recurring issues that suggest underlying wear and potential long-term maintenance challenges. The most critical failure occurred in 2025-08-26, where the axle 3 over-side spring brake chamber was found leaking air under foot brake application, a major defect that would compromise braking efficiency and safety. This failure was not isolated to a single component but reflects broader hydraulic and mechanical degradation in the braking system, particularly in the servo and master cylinder actuators. The subsequent MOTs have either passed without defects or issued advisories—such as heat cracks in brake discs from axle 1 and damaged tyre tread—highlighting persistent wear patterns rather than sudden deterioration. While the latest test is clean, the historical failures underscore the need for proactive maintenance, especially given the vehicle’s age and accumulated mileage. The recorded mileage of 591,876 miles for a vehicle aged approximately 11 years represents an exceptionally high annual usage rate of around 53,807 miles per year, which is far above the average for its class. Such heavy usage accelerates wear on critical systems, particularly brakes, suspension, and drivetrain components, as evidenced by the MOT history. The absence of significant mileage gaps suggests the vehicle has been in continuous operation, likely under demanding conditions, which may have led to premature failure of hydraulic components like the brake chamber and tyre degradation. For a diesel-powered truck of this size, excessive mileage also increases the risk of engine and transmission wear, though the MOT records do not explicitly detail drivetrain or engine-related issues. Buyers should be aware that this level of usage may have contributed to accelerated component fatigue, necessitating closer attention to fluid condition, suspension integrity, and brake system servicing. Given the vehicle’s history of MOT failures and advisories, the prospective buyer must conduct a thorough pre-purchase inspection to address immediate and long-term risks. Start with a visual and functional inspection of the braking system: check for leaks around the master cylinder, wheel cylinders, and brake chambers, particularly focusing on axle 3 where the 2025 failure occurred. Listen for abnormal brake pedal feel—such as sponginess, excessive travel, or binding—during a test drive, as these could indicate failing servos or hydraulic fluid contamination. Inspect brake discs for uneven wear, heat cracks, or corrosion, and verify that calipers are not binding or seized. Tyres should be examined for tread depth, sidewall damage, and signs of excessive heat exposure, as the 2024 advisory on axle 1 tyres suggests past or ongoing wear issues. Additionally, test the parking brake for proper engagement and check for excessive play or dragging, which could signal worn brake components or a failing spring brake system. Beyond the immediate inspection, the buyer should prioritise fluid checks, particularly brake fluid, which should be replaced if it exhibits contamination or has been in service for over two years due to the high mileage and potential hydraulic component wear. The suspension should be inspected for signs of bush wear, coil spring failure, or excessive play, as the MOT history hints at underlying suspension fatigue. Given the vehicle’s age and usage, a comprehensive service history review is essential to confirm compliance with manufacturer-recommended maintenance intervals, such as oil changes, filter replacements, and coolant system servicing. If possible, obtain a detailed service log or ask the seller for access to the vehicle’s maintenance records to confirm adherence to scheduled inspections. Finally, given the heavy mileage, consider a professional diagnostic check of the engine and transmission for signs of wear, such as oil consumption, excessive smoke, or unusual noise, as these could indicate deeper mechanical issues not captured in the MOT. Buyers should also be cautious of any visible signs of corrosion, particularly in areas exposed to moisture or where hydraulic components are located, as rust can exacerbate leaks and component failure.