2017 Mercedes-Benz CLA 2.1L Diesel · CX17 WDC

A pattern of critical suspension and brake deficiencies dominates this CLA’s recent MOT record, with the December 2025 test flagging a fractured nearside rear coil spring and a front service brake that was judged to be excessively fluctuating – both recorded as major failures – while the same session also noted lingering front‑disc wear and rear brake fluctuation as advisories. Earlier years show a repeat of coil‑spring fractures (off‑side rear in 2024) and persistent front disc scoring, so the trend is one of worsening rather than improving component health despite the vehicle otherwise meeting the pass criteria on several occasions. At 43,342 mi the car averages just under 5,000 mi per year, well below the typical utilisation for a nine‑year‑old Mercedes‑Benz. The low annual mileage suggests limited wear on drivetrain and engine internals, yet the MOT data reveal that even modest use has not prevented progressive suspension and brake wear. No significant gaps appear in the testing chronology – an MOT has been recorded each December – indicating the vehicle has been kept on the road regularly enough for defects to be captured in a timely manner. Potential buyers should give the rear suspension a thorough examination. A fractured coil spring can manifest as a noticeable sag on the affected side, a clunking noise over bumps, or uneven tyre wear; the chassis may also exhibit a slight pull when steering straight. Because a broken spring compromises the rear sub‑frame’s geometry, visual inspection of the mounting points for corrosion or deformation is essential, and replacement of the damaged spring (and possibly the associated damper) should be considered before any further road use. The brake system warrants immediate attention. Front discs that are pitted or scored can lead to reduced braking efficiency and pedal pulsation, especially when combined with the recorded excessive front‑service‑brake fluctuation. During a test drive, feel for any vibration or sponginess in the pedal, listen for squeal or grinding, and check that the vehicle stops in a straight line without pulling. Rear brake pads were flagged as thin in 2022, so confirm pad thickness and inspect the calipers for uneven wear. Finally, verify that the nearside tyre is free of the previously noted nail and that tyre tread depth meets legal limits, as a compromised tyre can exacerbate handling issues already hinted at by the suspension and brake findings.