2003 Mercedes-Benz CLK 5.0L Petrol · LX03 TKC

A persistent pattern of corrosion on the hydraulic brake lines alongside recurring minor electrical faults defines the underlying mechanical story of this Mercedes-Benz CLK, which successfully navigated its most recent test on November 28, 2025, without recording any formal defects. While the November 2024 test yielded a clean pass sheet alongside advisories noting an under tray and a slight oil misting on the gearbox, the historical record indicates a multi-year trend of repeated warnings concerning grease-covered and corroded brake pipes stretching back from 2020 through 2024. Additionally, indicator stalk and switch malfunctions appeared as advisory or minor defect items in both the 2019 and 2023 testing cycles, pointing to lingering chassis and cabin electrical vulnerabilities that persist despite continuous annual pass outcomes. Accumulating just 57,746 miles across its twenty-three years in service results in an average of roughly 2,511 miles driven annually, establishing a decidedly low-usage profile for this chassis. Testing records show uninterrupted annual inspection participation without multi-year operational gaps, indicating that the car has remained consistently registered and driven rather than being laid up for extended periods. Mechanically, this restricted annual mileage means that rubber components, seals, and hydraulic lines have aged primarily through time rather than high-load friction, though low-mileage vehicles can still suffer from localized corrosion and perished flexible elements due to short journeys and infrequent long-distance running. Prospective buyers must prioritize a rigorous physical inspection of the entire braking system, paying close attention to the hard metallic brake lines flagged repeatedly for corrosion and grease covering, as well as the nearside rear flexible brake hose noted as slightly deteriorated in 2023. During a thorough test drive, inspect the brake pedal travel and firmness for any sponginess, and listen carefully for any fluid leaks or dampness around the gearbox casing where oil misting was previously observed. Furthermore, thoroughly test the indicator stalk and switchgear functions through all settings to ensure the intermittent electrical faults recorded in past MOT tests have not progressed into complete unit failure. Evaluating the structural and mechanical health of this CLK requires lifting the vehicle to inspect the extent of the underbody corrosion behind the fitted under tray and verifying that the brake lines have been properly cleaned, treated, or replaced rather than merely masked. Pay attention to tyre edge wear patterns given the historical observation of rear tyres wearing near the legal limit, and listen for any suspension knocks or drivetrain vibrations while driving over uneven road surfaces. Ensuring all electrical accessories operate reliably will complete a thorough assessment of this low-mileage German coupe before finalizing a purchase decision.