2007 Mercedes-Benz SL 3.5L Petrol · K11 AAF

Chronic corrosion within the braking system is the primary mechanical concern for this vehicle, characterized by a progression from advisories to a dangerous failure of the nearside front brake pipe in June 2025. While the vehicle passed its most recent inspection on 16 June 2026, the record shows persistent advisories for corrosion on the offside front and both rear brake pipes, often noted as being covered in grease or other materials. This pattern suggests a systemic issue with the brake line integrity that has not been fully rectified despite the latest pass. The recorded mileage of 67,361 miles is low for a nineteen year old vehicle, averaging approximately 3,545 miles per year. Such a low rate of usage often correlates with extended periods of inactivity, which is reflected in the MOT history through recurring advisories for perishing and cracking rear tyres dating back to May 2023. This usage profile suggests the vehicle has spent significant time stationary, which can accelerate the degradation of rubber components and contribute to the surface corrosion observed on the chassis-mounted brake lines. A physical inspection should prioritize the condition of the brake pipes, specifically looking for flaking rust or evidence of sealant and grease used to mask corrosion on the offside front and rear lines. During a test drive, the buyer should be alert for any softening of the brake pedal or a lack of immediate response, which could indicate compromised hydraulic integrity. The recurring failures and subsequent passes regarding the horn also necessitate a functional check to ensure the electrical circuit is stable and not subject to intermittent faults. Attention must be paid to the rear tyres, as they have been flagged for cracking and perishing across multiple consecutive years of testing. A close examination of the sidewalls for weather-checking or deep cracks is essential, as these defects compromise structural integrity regardless of the remaining tread depth. Given the history of brake pipe failures and persistent corrosion advisories, verifying whether the lines have been fully replaced with new copper or coated steel piping, rather than merely treated, is critical for roadworthiness.