Description / Abstract: Material Description. Materials covered in this specification are motor vehicle hydraulic DOT 4 brake fluids composed of a suitable mixture of polyglycols, polyglycolether, boric acid ester, corrosion inhibitors and any necessary additives. Castor oil, mineral oil dirt and other contaminants are not permitted.

Symbols. Not applicable.

Applicability. This specification details the material and performance requirements for DOT 4 brake fluids for use in the braking system of motor vehicles.