Old style round reservoir ~12mm hand master cylinder. This master cylinder will operate a single F08 (or F05) brake caliper and is a standard replacement for '70s and '80s models (T3, G5, 850 LeMans, LeMans II, CX100, LeMans III, California II, Convert, etc) with the Moto Guzzi integrated braking system. Also is a nice update for single disk brake Eldorado or 850T models, providing a much better hydraulic ratio for improved braking with less lever effort. Replaces several obsolete Brembo master cylinders as used by Guzzi on bikes with integrated brake systems from 1975 through 1984. This master cylinder replaces alternate numbers 17660250, 17661052, 17660253, and 28660178. Uses the original Brembo brake levers, brake levers are sold separately. Note: Use only DOT3 or compatible fluid.