2007 Mercedes-Benz S-Class 3.0L Diesel · SL57 LCT

Recurring electronic parking brake faults and repeated tyre failures define the mechanical story of this 2007 S-Class, with two test failures in the last four years both featuring dangerous defects. The March 2022 failure cited a defective electronic parking brake control, a track rod end ball joint with excessive play, an illuminated engine management light, and two tyres below the 1.6mm legal tread limit; the vehicle passed a retest a fortnight later. More concerning, the March 2024 test recorded a dangerous parking brake efficiency reading below 50% of the required value with the brake inoperative on both sides, plus a nearside front tyre with ply or cords exposed and a nearside rear tyre below legal tread depth. That vehicle passed a retest one week later, and the most recent pass on 18 March 2024 carried advisories for a worn nearside front suspension arm bush, slight play in the nearside front wheel bearing, and an oil leak. The oil leak advisory has now appeared in 2019, 2023, and 2024, and the front suspension bush advisories have recurred across both sides in 2023 and again on the nearside in 2024, indicating wear items that are being monitored rather than resolved. At 137,087 miles over roughly nineteen years, the car has averaged about 7,215 miles annually, a typical accumulation for its age with no extended gaps in the testing record to suggest long lay-ups. Tests have been conducted consistently each year, with a shift from January to March test dates from 2022 onwards. This steady, moderate use pattern is consistent with the wear items recorded: suspension bushes, ball joints, and wheel bearings on a heavy luxury saloon of this age will wear regardless of mileage, and the recurring nature of these advisories suggests components approaching the end of their service life rather than isolated defects. The parking brake history warrants particular scrutiny before purchase. The electronic parking brake has failed twice in different ways, first as a control defect in 2022 and then as a dangerous efficiency failure affecting both sides in 2024. On a test drive, apply and release the parking brake repeatedly, confirm it holds the vehicle on an incline, and listen for the actuator motor operating correctly at the rear calipers. Given the 2022 engine management light failure, verify that no warning lights are illuminated and consider a diagnostic scan, as the cause of that MIL fault is not recorded as resolved beyond the retest pass. On the road, pay close attention to the front suspension and steering. The recurring suspension arm bush advisories and the 2022 track rod end failure mean you should listen for knocks or clonks over uneven surfaces, check for vague or wandering steering at speed, and feel for any play when rocking the steering at standstill. The nearside front wheel bearing with slight play may produce a low humming or droning that changes with road speed or when cornering. Inspect beneath the car for the persistent oil leak, checking the engine underside and the ground where the car is parked, and establish its source before committing, as a leak noted across three separate tests has not been rectified. Finally, given that four tyres across two tests were found below legal tread or with exposed cords, examine all four tyres carefully for tread depth, uneven wear patterns that would corroborate suspension wear, and overall condition.