Audi A4, S4, 8W (USA)

Brake fluid capacity & service interval

Audi A4, S4, 8W (USA) models require 1 liter of brake fluid. Service intervals include checking every 10000 miles or 12 months and changing every 24 months. The data covers 8 configurations.

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

TypeSpecifications
A4 40 TFSI quattro (150 kW) (2020- )
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 40 TFSI (140 kW) (2018-2020)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 45 TFSI (185 kW) (2018-2021)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
S4 3.0 TFSI quattro (260 kW) (2018- )
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 2.0 TFSI (185 kW) (2016-2018)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 2.0 TFSI quattro (185 kW) (2016-2018)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
A4 2.0 TFSI ultra (140 kW) (2016-2018)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months
S4 3.0 TFSI quattro (260 kW) (2016-2018)
  • Use: Normal
  • Capacity 1 liter
  • Check 10000 miles/ 12 months
  • Change 24 months

Additional Notes

  • Across all A4 and S4 configurations in the 8W platform, the brake fluid system capacity is listed at 1 liter. This figure represents the service fill volume for the brake circuit, not a full hydraulic overhaul quantity.
  • The check interval for all listed configurations is 10,000 miles or 12 months, whichever comes first under normal use conditions. This dual-trigger structure means time elapsed can prompt a check even before the mileage threshold is reached.
  • The change interval is set at 24 months for every configuration listed, applied under normal use conditions. Brake fluid absorbs moisture over time, which lowers its boiling point, so a time-based change interval is standard practice regardless of mileage accumulation.
  • The A4 2.0 TFSI ultra (140 kW) and the A4 40 TFSI (140 kW) share identical brake system capacity and interval specifications despite carrying different output designations. The 40 TFSI badge reflects Audi's power-based naming convention introduced in 2018, while the ultra designation was used in the earlier 2016-2018 period to indicate efficiency-focused variants.
  • The A4 45 TFSI (185 kW) covering 2018-2021 and the earlier A4 2.0 TFSI (185 kW) covering 2016-2018 both produce 185 kW and carry the same 1-liter capacity with identical check and change intervals, showing continuity in brake system specifications across the naming transition.
  • The S4 3.0 TFSI quattro (260 kW) appears in two separate row entries: one covering 2016-2018 and one starting from 2018. Both entries note the system as a hydraulic brake system, a distinction in labeling not used in the A4 rows, and both share the same 1-liter capacity and 24-month change interval.
  • The A4 40 TFSI quattro (150 kW) starting from 2020 carries a 150 kW output rating, which differs from the non-quattro A4 40 TFSI (140 kW) listed for 2018-2020. Despite the output difference, the brake fluid capacity and service intervals remain identical across both variants.

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