Carlube Dot 4 Brake fluid is a synthetic brake and clutch fluid, mostly specified for Disc Brake systems, giving high performance and protection exceeding FMVSS 116 Dot 3 and SAEJ 1703 specifications. It will mix safely with other brake fluids (E.R.B.P.) conforming to these specifications. Carlube Brake Fluids are a range of high boiling point brake fluids, designed for use in automotive applications as a hydraulic medium in disc and drum brake systems.