Audi 90 (EU)

Brake fluid capacity & service interval

Audi 90 (EU) brake fluid capacity is 0,6 liter. Service intervals include checking every 7500 km or 6 months and changing every 24 months. The data covers 7 configurations.

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

TypeSpecifications
90 2.0 (1987-1991)
  • Use: Normal
  • Capacity 0,6 liter
  • Check 7500 km/ 6 months
  • Change 24 months
90 2.2 (1986-1990)
  • Use: Normal
  • Capacity 0,6 liter
  • Check 7500 km/ 6 months
  • Change 24 months
90 quattro 2.0 (1986-1987)
  • Use: Normal
  • Capacity 0,6 liter
  • Change 24 months
90 quattro 2.2 (1986-1990)
  • Use: Normal
  • Capacity 0,6 liter
  • Change 24 months
90 2.0 (1985-1987)
  • Use: Normal
  • Capacity 0,6 liter
  • Check 7500 km/ 6 months
  • Change 24 months
90 2.2 (1985-1986)
  • Use: Normal
  • Capacity 0,6 liter
  • Check 7500 km/ 6 months
  • Change 24 months
90 quattro 2.2 (1985-1986)
  • Use: Normal
  • Capacity 0,6 liter
  • Change 24 months

Additional Notes

  • Across all Audi 90 (EU) configurations covered here, the hydraulic brake and clutch system shares a single reservoir with a capacity of 0.6 liter. This figure represents the service fill volume for the combined brake and clutch hydraulic circuit, not a full system overhaul quantity.
  • The 24-month change interval applies uniformly under normal use conditions across all seven configurations, spanning both the standard and quattro variants from 1985-1991. Brake fluid absorbs moisture over time, which lowers its boiling point, and a time-based interval rather than a mileage-based one reflects that degradation mechanism.
  • The 2.0 and 2.2 standard (non-quattro) variants carry an additional check interval of every 7,500 km or 6 months, whichever comes first. A check interval at this frequency is consistent with monitoring reservoir level and fluid condition between full change services.
  • The quattro variants — the 90 quattro 2.0 (1986-1987), 90 quattro 2.2 (1985-1986), and 90 quattro 2.2 (1986-1990) — list only the 24-month change interval without a separate periodic check interval, distinguishing them from the non-quattro 2.0 and 2.2 specifications.
  • The 90 2.0 appears in two distinct production spans, 1985-1987 and 1987-1991, yet both carry identical capacity and interval specifications. The split likely reflects a model revision or production change rather than any difference in hydraulic system requirements.
  • Similarly, the 2.2-liter engine appears in overlapping production spans — 1985-1986 and 1986-1990 for both the standard and quattro variants — with no variation in the 0.6-liter capacity or the 24-month change interval between the earlier and later production ranges.

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