master cylinder master copy • masterdom · · · Info · Definitions · Synonyms · Characters · · master cylinder · · Text Common · · Latin · · Scripts 15 · · Length 5 · · Syllables Definitions · · · (noun) a cylinder that contains brake fluid that is compressed by a piston. Synonyms: brake cylinder, hydraulic brake cylinder, master cylinder. · · Noun Definition 1 Synonyms · · · brake cylinder · · Synonym 1 hydraulic brake cylinder · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079