Master cylinder brakes of OEM 113611021CBR fits for VW Beetle Cabrio 1950 – 1964, Beetle 1953 – 1964, Karmann Ghia 1960 – 1964. The reference number is 113611021CBR / 113611021C / RCCM 2163.1 / 113 611 021 CBR / 113 611 021 C TRW / 53754008381 / 537 54008 381. It is single circuit type with the piston diameter of 19.05mm. It fits for drum brake system and uses DOT4 as the brake fluid. The size of the end thread is M10x1.