Opel Admiral

Brake fluid capacity & service interval

Opel Admiral brake fluid specifications cover a brake fluid capacity of 0.42 liter. The service interval for brake fluid change is 20000 km. The data includes 3 configurations for the model.

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

TypeSpecifications
Admiral 2.8 E (1969-1977)
  • Use: Normal
  • Capacity 0,42 liter
  • Change 20000 km
Admiral 2.8 H (1969-1977)
  • Use: Normal
  • Capacity 0,42 liter
  • Change 20000 km
Admiral 2.8 S (1969-1977)
  • Use: Normal
  • Capacity 0,42 liter
  • Change 20000 km

Additional Notes

  • The Opel Admiral brake fluid capacity of 0.42 liter applies to the hydraulic brake system, representing the total fluid volume held within the system including the master cylinder reservoir, brake lines, and calipers or wheel cylinders.
  • All three Admiral variants covered here — the 2.8 E, 2.8 H, and 2.8 S — share an identical 0.42 liter capacity, indicating no variation in hydraulic brake system volume across the engine lineup for the 1969-1977 period.
  • The specified change interval of 20000 km applies under normal use conditions, meaning routine driving without the elevated thermal or mechanical stress associated with severe service classifications.
  • Brake fluid is hygroscopic, meaning it absorbs moisture from the atmosphere over time, which lowers its boiling point. The 20000 km interval reflects the point at which fluid degradation from moisture absorption is considered significant enough to warrant replacement.
  • The 0.42 liter figure represents a service fill capacity for the hydraulic brake system, not an overhaul or dry-fill value, and is the volume relevant to a standard fluid change procedure.

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