Audi A4, S4, RS 4 Cabriolet, 8H / B7 (USA)

Brake fluid capacity & service interval

Audi A4, S4, RS 4 Cabriolet, 8H / B7 (USA) models require brake fluid with a capacity range of 1 to 2 liters. Service intervals include checks at 5000 miles or 12 months, 10000 miles or 12 months, and fluid changes every 24 months. The data covers 10 configurations.

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

TypeSpecifications
RS 4 Cabriolet (309 kW) (2007-2009)
  • Use: Normal
  • Capacity 2 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
RS 4 Cabriolet (309 kW) (2007-2009)
  • Use: First check only
  • Capacity 2 liter
  • Check 5000 miles/ 12 months
S4 Cabriolet (253 kW) (2006-2008)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
S4 Cabriolet (253 kW) (2006-2008)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
A4 Cabriolet 2.0 (147 kW) (2005-2008)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 Cabriolet 2.0 (147 kW) (2005-2008)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
A4 Cabriolet 2.0 quattro (147 kW) (2005-2008)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 Cabriolet 2.0 quattro (147 kW) (2005-2008)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
A4 Cabrriolet 3.2 quattro (188 kW) (2005-2008)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 Cabrriolet 3.2 quattro (188 kW) (2005-2008)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months

Additional Notes

  • Across the A4 Cabriolet 2.0 (147 kW), A4 Cabriolet 2.0 quattro (147 kW), A4 Cabriolet 3.2 quattro (188 kW), and S4 Cabriolet (253 kW), the brake system fluid capacity is specified at 1 liter, regardless of engine output or drivetrain configuration.
  • The Audi RS 4 Cabriolet (309 kW) carries a brake system fluid capacity of 2 liters, which is double the figure listed for all other variants in the lineup.
  • A 2-liter brake fluid capacity in the RS 4 Cabriolet reflects a larger or more complex brake circuit, consistent with the higher-performance braking hardware typically found on high-output variants.
  • Under normal use conditions, all configurations share a brake fluid check interval of 10,000 miles or 12 months, whichever comes first.
  • A separate first-check-only interval of 5,000 miles or 12 months applies across all configurations, representing an earlier inspection tied specifically to the initial service period rather than ongoing maintenance.
  • The change interval for brake fluid is set at 24 months under normal use conditions, a figure that applies uniformly to all variants from the A4 Cabriolet 2.0 through the RS 4 Cabriolet. A 24-month replacement cycle is standard practice for brake fluid, as the fluid is hygroscopic and absorbs moisture over time, which lowers its boiling point.
  • The S4 Cabriolet (253 kW) covers model years 2006-2008, making its introduction one year later than the A4 Cabriolet variants, which begin in 2005.
  • The RS 4 Cabriolet (309 kW) spans 2007-2009, the latest starting year among all configurations listed, and is the only variant with a 2-liter brake fluid capacity specification.

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