Hello from ALFRO. I have a 1968 Duetto that needs some work. To start the Dunlop brakes are pretty much non existant. Pedal is rock hard with minimal stopping power. Not sure how to proceed. Just bleed or consider an upgrade to something more dependable. There is no booster circuit in the system nor does it appear to have a proportioning valve. The master cylinder is a 3/4 or 7/8 diameter (Bonaldi ?)

fed from a gravity reservois. Want to drive but it seems somewhat suicidal without reliable braking. Please advise with suggestions. Thanks