AFCO Integral Reservoir Master CylinderAFCO's Master Cylinders offer the same great performance customers have come to expect. One piece design that incorporates a high capacity reservoir and precisely machined polished cylinder bore, the piece makes an efficient use of space and materials. External return spring maintains positive pedal feel and helps prolong pad life by ensuring quick reaction to released pedal force. Precise fit lid is held firmly in place by heavy gauge retainer. Slim