Ducati MULTISTRADA 1200S ABS 2015 Workshop Manual page 76

Attach a transparent plastic tubing to the bleed valve (3) and insert the other end of the tubing in a container
placed on the floor.
Open the bleed valve (3) to allow fluid to flow out.
Warning
During the filling operation, always keep the fluid level above the MIN mark to avoid any air bubbles in the circuit.
Allow the fluid to flow from the bleed valve (3) until it changes colour.
Screw bleed valve (3) again, and tighten it to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) and restore fluid
correct level inside reservoir.