2019 Mercedes-Benz Citan 1.5L Diesel · JB57 BOO

A pattern of rear braking system wear has emerged across this Citan's recent MOT history, providing the most useful mechanical insight for any prospective buyer. The most recent test on 15 June 2026 returned a clean pass with no defects recorded, continuing the vehicle's unbroken run of passes since first registration. However, the 2025 examination flagged three advisories all concentrated on the rear axle: both rear brake pipes were noted as corroded though coated in grease or other material, and the nearside rear brake disc showed evidence of pitting and scoring on its inner face. The fact that these advisories did not appear in either the 2024 or the 2023 test suggests the deterioration developed within a relatively short window, which is worth weighing carefully given the vehicle's modest annual mileage and the age of the brake hydraulic components. Against a seven-year registration period, the recorded 61,914 miles equates to roughly 8,845 miles per year, a figure broadly in line with typical light commercial or family multi-purpose vehicle usage. The mileage progression between tests is consistent and gradual, with no evidence of rapid accumulation or extended gaps that might indicate prolonged standing or clock irregularities. Mechanically, this level of use tends to preserve tyres, clutches and drivetrain internals, but it also means that the braking and underbody components flagged in 2025 have reached a serviceable threshold at a relatively low wear point. The combination of consistent annual mileage and a clustered set of rear brake advisories points towards localised corrosion rather than high-mileage component exhaustion. For a prospective buyer, the priority during inspection should be the rear braking system given the specific advisories on record. The rear brake pipes should be examined closely along their entire length, particularly at mounting clips, unions and any area where the underbody shield or fuel lines come into contact, looking for surface corrosion that has penetrated through any protective grease coating and progressed to pitting of the steel itself. A firm press of the brake pedal should produce a solid, confident feel without excessive travel, sponginess or a soft bite point that might indicate compromised hydraulic integrity. The rear discs should be inspected through the wheel spokes for a pronounced lip on the inner edge, deep scoring visible across the friction surface, or any bluish heat discolouration suggesting repeated heavy braking from partially seized callipers. On a test drive, attention should be directed towards symptoms that would confirm or refute the advisory findings. Listen for any rhythmic scraping or grinding from the rear wheels when braking at low speed, which could indicate a worn disc contacting the pad backing plate, and feel for any vibration or judder through the brake pedal under firm application. The vehicle should track straight under braking with no pull to one side, and the handbrake should hold the vehicle on a moderate slope without requiring excessive travel. Given the Citan's commercial vehicle underpinnings, it is also prudent to inspect the rear axle beam, trailing arms and coil springs for any surface corrosion beyond cosmetic levels, and to check the underside generally for fresh oil or fluid residue around the rear callipers, as any active hydraulic leak would necessitate immediate pipe and likely calliper overhaul before the vehicle could be considered roadworthy for ongoing use.