Acura RDX, TB3, TB4 (USA / CAN)

Brake fluid capacity & service interval

Acura RDX, TB3, TB4 (USA / CAN) models require brake fluid with a capacity range between min and max. The service interval for fluid replacement is 36 months. The data covers 2 configurations.

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

TypeSpecifications
RDX 3.5 i-VTEC V6 (2015-2018)
  • Use: Normal
  • Between min and max.
  • Change 36 months
RDX 3.5 i-VTEC V6 AWD (2015-2018)
  • Use: Normal
  • Between min and max.
  • Change 36 months

Additional Notes

  • The Acura RDX TB3/TB4 brake fluid specification calls for a fill level between the reservoir's minimum and maximum marks rather than a fixed volume, which is standard practice for hydraulic brake systems where the fluid level is managed by topping off rather than a measured overhaul quantity.
  • Both the front-wheel-drive and AWD variants of the 3.5 i-VTEC V6 share an identical 36-month change interval under normal use conditions, applying uniformly across the 2015-2018 model years.
  • The 36-month interval is time-based rather than mileage-based, reflecting the nature of brake fluid degradation, which is driven primarily by moisture absorption over time rather than distance traveled.
  • The normal use condition tied to the 36-month interval applies to both drivetrain configurations without distinction, meaning the AWD system's additional mechanical components do not alter the brake fluid service schedule relative to the FWD variant.

Other Systems