2016 Mercedes-Benz E 2.1L Diesel · G3 RNS

The 2016 MERCEDES-BENZ E presents a clear pattern of recurring front brake disc wear across three distinct test periods spanning late 2024 through 2025, with the 2025-09-12 failure followed by a successful re-test on 2025-09-16 confirming that the initial issue was addressed. Subsequent passes in September 2025 and October 2024 further confirm that the vehicle has returned to compliant roadworthiness, though the persistence of front disc advisories indicates a sustained point of concern rather than isolated incidents. Overall, the MOT history reveals a stable trajectory where the critical safety component—front brake discs—has required attention twice within a six-month window, while other systems such as the tyres showed temporary degradation in 2023 before returning to acceptable levels. At 91,267 miles on a ten-year-old chassis, the vehicle accumulates approximately 9,127 miles annually, a rate that aligns with typical usage for its age and suggests moderate daily or weekly driving patterns. The absence of extended lay-up periods between tests indicates consistent ownership and regular inspection, yet the repeated front brake disc warnings imply that the front end has experienced cumulative wear that exceeded safe thresholds despite timely repairs. The occasional rear and offside disc advisories observed alongside the main front concerns hint at potential uneven brake distribution or subframe fatigue, but the primary mechanical narrative centres on the front brake system requiring ongoing monitoring rather than sudden deterioration. During a test drive, pay particular attention to the front left brake disc when applying the brakes at moderate speed, listening for any grinding or pulsating sounds that would signal remaining material loss or misalignment. The right front disc should also be assessed for similar characteristics, and any difference in braking feel or pedal modulation warrants investigation. On the rear and offside sides, verify that the tyres maintain proper contact patch width and that there are no visible signs of uneven wear beyond the 2023 warning period, as these areas may have accumulated minor damage during earlier heavy-use phases. A thorough visual inspection of the brake caliper mounting bolts and disc backing plates will help confirm whether the previously noted wear has stabilised or continued to progress since the 2025-09-12 failure.