This International Standard specifies performance tests of brake cups and seals for hydraulic braking systemsfor road vehicles. It does not include requirements relating to chemical composition, tensile strength andelongation of the rubber compound. Disc brake seals are not covered by this International Standard.This International Standard is applicable to moulded seals (cups or double-lipped type gland seals), indiameter and smaller, compounded from rubber, for use in hydraulic actuating cylinders employing road vehiclenon-petroleum base hydraulic brake fluid conforming to the requirements of ISO4925.NOTEThe rubber used in these seals shall be suitable for operation in a temperature range of -40 degrees C to +70 degrees C.