Audi A6, S6, RS 6, 4B (USA)

Brake fluid capacity & service interval

Audi A6, S6, RS 6, 4B (USA) models require 1 liter of brake fluid. Service intervals include checks at 5000 miles or 12 months and 10000 miles or 12 months, with a fluid change required every 24 months. The data covers 15 configurations.

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

TypeSpecifications
S6 4.2 V8 5V quatrro (220 kW) (2003-2004)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
S6 4.2 V8 5V quatrro (220 kW) (2003-2004)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
A6 2.7 5V Bi Turbo quattro (169 kW) (2002-2004)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A6 2.7 5V Bi Turbo quattro (169 kW) (2002-2004)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
A6 3.0 5V (162 kW) (2002-2004)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A6 3.0 5V (162 kW) (2002-2004)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
A6 3.0 5V quattro (162 kW) (2002-2004)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A6 3.0 5V quattro (162 kW) (2002-2004)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
RS 6 4.2 V8 5V Turbo quattro (331 kW) (2002-2004)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
RS 6 4.2 V8 5V Turbo quattro (331 kW) (2002-2004)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
S6 4.2 V8 5V quattro (220 kW) (2002-2004)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
S6 4.2 V8 5V quattro (220 kW) (2002-2004)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
S6 4.2 V8 5V quattro (250 kW) (2002-2004)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
S6 4.2 V8 5V quattro (250 kW) (2002-2004)
  • Use: First check only
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
A6 3.0 5V quattro (162 kW) (2001-2002)
  • Use: Normal
  • Capacity 1 liter
  • Check 5000 miles/ 12 months
  • Change 24 months

Additional Notes

  • A brake fluid system capacity of 1 liter is a service fill figure, representing the volume held within the reservoir and lines of a standard hydraulic brake circuit rather than a full system overhaul quantity.
  • Across all configurations listed, the 24-month change interval applies under normal use conditions, reflecting the well-known hygroscopic nature of brake fluid, which absorbs moisture over time and lowers its boiling point regardless of mileage accumulated.
  • The first check only condition carries a 5000-mile or 12-month inspection interval, which is an earlier checkpoint applied once at the start of a service cycle before the standard 10000-mile or 12-month normal-use schedule takes over.
  • The A6 3.0 5V quattro (162 kW) in the 2001-2002 model years carries a normal-use check interval of 5000 miles or 12 months, whereas the same engine configuration for 2002-2004 moves to a 10000-mile or 12-month check interval under normal use.
  • The RS 6 4.2 V8 5V Turbo quattro at 331 kW shares the same 1-liter capacity and identical check and change intervals as the lower-output A6 and S6 variants, despite the substantially higher power output of the twin-turbocharged V8.
  • Two distinct S6 4.2 V8 5V quattro variants appear in the specifications: one rated at 220 kW and another at 250 kW, both covering 2002-2004 and both referencing a hydraulic brake system with a 1-liter capacity, a 10000-mile or 12-month normal check interval, and a 24-month fluid change.
  • A separate 220 kW S6 4.2 V8 5V quattro entry labeled for 2003-2004 references the brake system without the hydraulic qualifier used in the 2002-2004 entries, representing a distinct row in the specifications for that narrower year range.

Other Systems