The specifications cover molded cups 51 mm (2 in) in diameter and under, compounded from high temperature resistant rubber for use in hydraulic actuating cylinders employing motor vehicle brake fluid conforming to requirements in SAE J1703 and SAE J1705. Specifications covered are performance tests of hydraulic brake cups under specified conditions and do not include requirements relating to tensile strength, chemical composition and elongation of the rubber compound. Not covered by this document are disc brake seals.