2012 Mercedes ML 250 2.1L Diesel · RA12 ULP

A recurring pattern of drivetrain and braking system issues defines the mechanical profile of this Mercedes ML 250, culminating in a significant failure regarding the parking brake system during the most recent test on 23 June 2026. While the vehicle passed its latest MOT on 24 June 2026, the immediate preceding failure involved a major defect where the electronic parking brake warning indicated a malfunction and the nearside rear parking brake was inoperative. This follows a history of CV boot deterioration and fractured coil springs, suggesting that while the vehicle is currently roadworthy, it has experienced intermittent failures in both its suspension and braking components. The recorded mileage of 111,528 miles over approximately fourteen years represents an average annual usage of roughly 7,966 miles, which is consistent with typical long-term driving patterns for a vehicle of this age. This moderate mileage suggests that mechanical wear on consumables like suspension bushes, brake discs, and drivetrain components should be proportional to the vehicle's age rather than indicative of heavy commercial or high-intensity use. However, the presence of multiple failures related to CV boots and coil springs indicates that even with moderate mileage, specific components are reaching the end of their service life or are susceptible to environmental degradation. Prospective buyers should pay close attention to the braking system and the underside of the vehicle. The recent failure of the electronic parking brake and the advisory regarding marginal parking brake efficiency necessitate a thorough investigation of the calipers and the electronic actuator mechanism. During a test drive, listen for any unusual clicking or grinding noises when engaging the parking brake and check for any dragging or binding sensations that might indicate a sticking caliper. Additionally, the repeated advisory regarding covers fitted to the underside of the vehicle obscuring testable items means that a physical inspection of the subframe, exhaust system, and fuel lines is essential to ensure no hidden corrosion or leaks are present. The history of CV boot deterioration and fractured coil springs also warrants a focused inspection of the front and rear suspension assemblies. The offside drive shaft joint constant velocity boot was flagged for severe deterioration in both 2023 and 2025, so it is vital to verify that the recent repairs have addressed this and that no grease is leaking from the joints. On the road, pay attention to any knocks, clunks, or heavy thuds when driving over uneven surfaces or speed bumps, as these are common symptoms of worn suspension bushes or compromised coil springs. Any pulling to one side during braking or steering should also be investigated to rule out further issues with the drive shafts or suspension geometry.