This super-compact master cylinder with lever was specifically designed to be used in conjunction of our weld-on hand controls, so they can be used as brake or hydraulic clutch levers. Machined out of billet aluminum it can be easily hidden on the bike for a super-clean look. It can be welded vertically or horizontally under the seat, under the tank or in any other place hidden or not. This 9/16″ bore master cylinder can be used with single 2-piston caliper, 4-piston caliper, 6-piston caliper or dual 2-piston calipers. Mounting bracket will need to be fabricated and welded to the desired location. Fluid reservoir not included. NOTE: we suggest to use DOT 4 brake fluid. in any case do not use silicon based oils.