Bosch wheel brake cylinder: long safe braking wheel brake cylinders must be replaced if dust protection cuffs are defective or leaks occur. Otherwise, brake fluid may get on the pads and affect the braking effect. Bosch wheel brake cylinders are made of cast or aluminium. These high-quality materials, together with tight tolerances, ensure a long service life as well as optimal function and tightness. Technical data: diameter 20.64 mm