Porsche 928 (EU)

Brake fluid capacity & service interval

Porsche 928 (EU) brake fluid capacity is 0,2 liter. Service intervals include a 24 month change and a 20000 km check. The data covers 6 configurations.

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

TypeSpecifications
928 GTS (1991-1995)
  • Use: Normal
  • Capacity 0,2 liter
  • Check 20000 km
  • Change 24 months
928 GT (1989-1992)
  • Use: Normal
  • Capacity 0,2 liter
  • Check 20000 km
  • Change 24 months
928 S4 (1986-1992)
  • Use: Normal
  • Capacity 0,2 liter
  • Check 20000 km
  • Change 24 months
928 S (1984-1986)
  • Use: Normal
  • Capacity 0,2 liter
  • Change 24 months
928 S (1980-1984)
  • Use: Normal
  • Capacity 0,2 liter
  • Change 24 months
928 (1977-1982)
  • Use: Normal
  • Capacity 0,2 liter
  • Change 24 months

Additional Notes

  • Across all six configurations of the Porsche 928 (EU) covered in the 1977-1995 period, the brake fluid reservoir capacity is uniformly specified at 0.2 liter. This figure represents the service fill volume for the hydraulic system reservoir, not a total system flush volume.
  • The 24-month change interval applies to all configurations regardless of variant or production era, reflecting the well-established hygroscopic nature of brake fluid, which absorbs moisture over time and lowers its boiling point independent of mileage accumulation.
  • The base 928 (1977-1982) and the 928 S in both its 1980-1984 and 1984-1986 forms are specified solely for a hydraulic brake system, with no clutch circuit included in the fluid capacity or service scope.
  • The 928 GT (1989-1992), 928 GTS (1991-1995), and 928 S4 (1986-1992) are each noted as covering a combined hydraulic brake and clutch system, meaning the single 0.2-liter capacity figure encompasses both circuits in those variants.
  • A 20,000 km check interval appears in the specifications for the 928 GT, 928 GTS, and 928 S4, but is absent from the earlier 928 (1977-1982) and 928 S entries, where only the 24-month change interval is listed.
  • The 928 S appears across two distinct year ranges, 1980-1984 and 1984-1986, with identical capacity and interval specifications in both. The split reflects a model revision boundary rather than any change in brake fluid service requirements.
  • The 928 S4 (1986-1992) represents the earliest configuration in the dataset to combine the brake and clutch hydraulic system under a single fluid entry, coinciding with the introduction of the mileage-based check interval alongside the time-based change schedule.

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