Mercedes-Benz Citan, 420 (EU)

Brake fluid capacity & service interval

Mercedes-Benz Citan, 420 (EU) uses brake fluid with a capacity range between min and max. The service interval is 24 months. The data covers 5 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
Citan 108 CDI, 420.613/713 (2021- )
  • Use: Normal
  • Between min and max.
  • Change 24 months
Citan 110, 420.653/753 (2021- )
  • Use: Normal
  • Between min and max.
  • Change 24 months
Citan 110 CDI, 420.623/723 (2021- )
  • Use: Normal
  • Between min and max.
  • Change 24 months
Citan 112 CDI, 420.633/733 (2021- )
  • Use: Normal
  • Between min and max.
  • Change 24 months
Citan 113, 420.663/763 (2021- )
  • Use: Normal
  • Between min and max.
  • Change 24 months

Additional Notes

  • Across all five Mercedes-Benz Citan 420 variants listed, the brake fluid fill quantity is not expressed as a fixed volume. Instead, the specification calls for a level between the minimum and maximum marks on the reservoir, which is standard practice for hydraulic brake systems where the exact volume depends on component wear state and system design.
  • The 24-month change interval applies uniformly under normal use conditions across the 108 CDI, 110 CDI, 110, 112 CDI, and 113 variants. A time-based interval rather than a mileage-based one reflects the hygroscopic nature of brake fluid, which absorbs moisture from the atmosphere over time regardless of how much the vehicle is driven.
  • The shared hydraulic brake/clutch system noted for each variant means a single fluid reservoir serves both the braking circuit and the clutch actuation circuit. In such configurations, fluid condition affects both systems simultaneously, which reinforces the relevance of the fixed 24-month replacement cycle.
  • The Citan 420 lineup covered here spans both diesel and petrol powertrains. The CDI designations (108 CDI, 110 CDI, 112 CDI) indicate diesel engines, while the 110 (420.653/753) and 113 (420.663/763) are petrol variants. Despite the difference in drivetrain type, the brake fluid specification and service interval are identical across all five configurations.
  • The variant codes follow a consistent numbering pattern within the 420 body series. The suffix pairs such as 420.613/713 and 420.623/723 reflect panel van and crew van body configurations respectively, yet the brake fluid service data remains uniform across both body styles within each powertrain variant.

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