2007 Mercedes-Benz R-Class 3.0L Diesel · KU07 ABD

The most recent recorded MOT test for this Mercedes R-Class was conducted on 12 August 2022 and resulted in a fail, with a combination of advisory and major defects, including one classified as dangerous. The dangerous defect related to the offside rear tyre tread depth falling below the legal minimum of 1.6mm, which is a serious safety concern as it would have significantly reduced wet grip and increased braking distances. The major failures included an inoperative position lamp on the nearside rear, a parking brake efficiency below requirements, and an offside rear parking brake that was inoperative on one side, indicating uneven brake actuation or caliper/seal issues. With only this single recent test on record, it is difficult to establish a definitive maintenance trajectory, but the presence of multiple major and dangerous defects at one inspection raises concerns about the level of mechanical attention the vehicle has received. A prospective buyer should treat this as a flag warranting immediate, thorough inspection of the braking system, tyres, and rear lighting before any purchase proceeds. The recorded mileage of 122,534 miles over approximately nineteen years equates to an annual average of around 6,449 miles, which is broadly typical for a vehicle of this age, though it sits at the lower end of normal usage. This relatively modest annual mileage suggests the vehicle may have experienced periods of standing or limited use, which can lead to its own set of mechanical concerns distinct from high-mileage wear. Long periods of inactivity commonly result in brake disc corrosion from surface rust, binding or seized brake calipers due to lack of regular piston movement, deterioration of rubber components such as suspension bushes and gaiters, and degradation of fluids that require time-based servicing rather than mileage-based intervals. Conversely, components associated with high wear such as the clutch, engine internals, and major drivetrain parts should show proportionally less degradation than on a higher-mileage example. Given the vehicle's age of nearly two decades and the nature of the recorded defects, a prospective buyer should carry out several focused inspections before purchase. The braking system demands particular attention: the inoperative offside rear parking brake suggests a seized caliper, stretched or broken parking brake cable, or a faulty actuator, all of which would require rectification for an MOT pass. On a test drive, listen for any grinding, squealing, or pulsation through the brake pedal, and verify that the vehicle pulls up straight without pulling to one side, which would indicate uneven caliper operation or a sticking piston. Inspect all brake discs for significant lipping at the outer edge and heavy scoring, and check that the handbrake holds the vehicle firmly on an incline. The tyres should be examined not only for tread depth but also for sidewall cracking or perishing, which is common on age-compromised rubber regardless of remaining tread. Even where tread remains legal, tyres over six years old may require replacement due to hardening and reduced grip, and the production date can be identified from the DOT markings on the sidewall. Beyond the braking and tyre concerns highlighted by the MOT record, several age-related checks are essential for a vehicle of this vintage. The 12V battery should be tested for cranking strength and voltage retention, as batteries beyond five years of age often struggle in cold conditions. All fluid systems, including engine oil, coolant, brake fluid, transmission fluid, and power steering fluid, should be inspected for condition and service history; brake fluid is hygroscopic and typically requires replacement every two years regardless of mileage, while coolant systems benefit from periodic renewal to prevent internal corrosion. The underside of the vehicle should be examined on a ramp for exhaust integrity, noting that the R-Class is large and heavy, placing greater stress on mounting points and suspension components. Pay particular attention to the coil springs for signs of corrosion or breakage, the anti-roll bar bushes and drop links for splitting, and the lower control arm bushes for deterioration, as worn suspension components will produce clonking or knocking noises over uneven surfaces during a test drive. Finally, verify that the service book contains regular stamps and that the timing belt or chain has been replaced at the manufacturer-recommended interval, as neglect of this on a Mercedes of this age can lead to catastrophic engine damage.