Audi A4, S4 Cabriolet, 8H / B6 (USA)

Brake fluid capacity & service interval

Audi A4, S4 Cabriolet, 8H / B6 (USA) models require 2 liter of brake fluid. Service intervals include checks at 5000 miles or 12 months and 10000 miles or 12 months, with a fluid change every 24 months. The data covers 6 configurations.

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

TypeSpecifications
S4 Cabriolet (253 kW) (2003-2005)
  • Use: Normal
  • Capacity 2 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
S4 Cabriolet (253 kW) (2003-2005)
  • Use: First check only
  • Capacity 2 liter
  • Check 5000 miles/ 12 months
A4 Cabriolet 1.8 T (125 kW) (2002-2005)
  • Use: Normal
  • Capacity 2 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 Cabriolet 1.8 T (125 kW) (2002-2005)
  • Use: First check only
  • Capacity 2 liter
  • Check 5000 miles/ 12 months
A4 Cabriolet 3.0 5V (162 kW) (2002-2005)
  • Use: Normal
  • Capacity 2 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 Cabriolet 3.0 5V (162 kW) (2002-2005)
  • Use: First check only
  • Capacity 2 liter
  • Check 5000 miles/ 12 months

Additional Notes

  • Across all three engine variants in the Audi A4 and S4 Cabriolet 8H / B6 lineup, the brake fluid system capacity is uniformly rated at 2 liters, which is a typical figure for a passenger car brake circuit and reflects a service fill rather than a dry-system overhaul quantity.
  • Under normal use conditions, the 1.8 T (125 kW) and 3.0 5V (162 kW) A4 Cabriolet variants both follow a check interval of 10,000 miles or 12 months, whichever comes first, with a fluid change required every 24 months.
  • The S4 Cabriolet (253 kW), covering model years 2003-2005, carries the same normal-use check interval of 10,000 miles or 12 months and the same 24-month change interval, with the system specifically identified as the hydraulic brake system rather than simply the brake system.
  • A "first check only" condition applies to all three engine variants, requiring an earlier inspection at 5,000 miles or 12 months. This shortened initial interval is a break-in period check rather than a recurring schedule, and no fluid change interval is associated with it in the specifications.
  • The 5,000-mile first-check interval for the 1.8 T and 3.0 5V A4 Cabriolet variants represents half the distance of the standard 10,000-mile recurring check, indicating a closer initial inspection window before the normal schedule takes effect.
  • The S4 Cabriolet's first-check-only interval mirrors the A4 Cabriolet variants at 5,000 miles or 12 months, meaning the higher-output 253 kW engine configuration does not carry a more frequent early inspection requirement despite its greater power output.
  • The 24-month brake fluid change interval, shared across all variants under normal use, is consistent with the moisture-absorption characteristics of glycol-based brake fluids, which degrade over time regardless of mileage accumulation.

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