2021 Mercedes-Benz Sprinter 315 Progressive CDI 1.9L Diesel · SH71 FSG

The latest MOT test for the 2021 Mercedes-Benz Sprinter 315 Progressive CDI, conducted on 2025-11-18, resulted in a failure due to critical issues that were not present in the preceding two MOTs. The vehicle previously passed in November 2024 and November 2025, with the most recent test revealing a major failure in parking brake efficiency alongside persistent advisories on both nearside and offside rear brake discs being worn, pitted, or scored, and offside rear brake pads wearing thin. This represents a clear deterioration in brake system integrity, suggesting either inadequate maintenance or progressive wear beyond the limits permitted by the DVSA. The failure highlights a concerning trend where the braking mechanism, particularly the rear calipers and pads, has not been adequately serviced or replaced, which could compromise stopping performance and safety. The recorded mileage of 95,217 miles for a vehicle aged five years indicates a high annual usage rate of approximately 19,043 miles per year, which is notably elevated for its age. Sprinters of this model and specification are designed for heavy-duty use, and such sustained mileage accelerates wear on consumables like brake pads, brake discs, suspension components, and drivetrain elements. The absence of significant mileage gaps suggests the vehicle has been in regular, possibly demanding service, which may explain the observed brake wear progression. However, the high mileage alone does not justify the severity of the current brake failures without corroborating evidence of maintenance neglect or excessive load cycles, particularly on the rear braking system. For the prospective buyer, the most urgent concern is the brake system, which has failed the latest MOT due to worn and pitted discs and inadequate parking brake function. On a test drive, listen for uneven brake pedal travel, a spongy or soft feel, or excessive pedal travel, which may indicate caliper binding or hydraulic issues. Inspect the rear brake discs for excessive glazing, scoring, or warping, and check for brake fluid leaks around the calipers or master cylinder. The parking brake should engage smoothly without excessive force or dragging, and the vehicle should hold position without movement when parked on a grade. Immediate attention is required to replace the rear brake pads and discs, and to service or replace the parking brake mechanism, which may involve checking the cable tension, brake shoe wear, or hydraulic components. Additionally, consider a thorough inspection of the rear suspension, as excessive wear on the discs could also signal underlying issues such as misaligned wheels or worn suspension bushes. Beyond the brake system, given the vehicle’s age and high mileage, the buyer should conduct a comprehensive physical inspection. Check the tyres for sidewall cracking or perishing, which can occur even at moderate mileages due to prolonged exposure to UV light and temperature fluctuations. Verify that the tyres meet the legal minimum tread depth of 1.6mm and that there are no signs of uneven wear patterns, which could indicate alignment or suspension issues. Inspect the exhaust system for corrosion, leaks, or excessive noise, as the Sprinter’s diesel engine may be prone to emissions-related wear over time. Pay particular attention to the catalytic converter and oxygen sensors, which can fail due to prolonged use or poor fuel quality. Lastly, assess the battery health, as Sprinters often experience standing corrosion or electrical system degradation when left unused for extended periods. Test the 12V battery’s charge cycle and check for signs of corrosion on terminals and connections, and ensure all electrical systems, including the starter motor and alternator, are functioning correctly. While the MOT history does not show fluid advisories, consider a service history check to confirm that oil, coolant, and transmission fluid have been changed according to manufacturer recommendations, particularly given the high mileage.