Ducati Diavel Workshop Manual page 394

Front brake control
When reconnecting the brake hose to the calliper or master cylinder, make sure to install the sealing washers (4) either
side of the hose end fitting.
After having oriented the pipe fitting (24) tighten the screw (3) to a torque of 23 Nm ± 10% (Sect. 3 - 3, Frame torque
settings).
After having oriented the pipes (13) and (20) in the front brake callipers (18) and (9) tighten the special screws (19) and
(25) to a torque of 23 Nm ± 10% (Sect. 3 - 3, Frame torque settings).
Note
Make sure that internal pipe fitting (13) and the external pipe fitting (20) are installed in the left brake calliper (9).
Fit the left calliper (9) over the disk.
Apply the recommended grease to the screws (21).
Hand tighten the screws (21) to secure the callipers to the fork legs.
Operate the brake lever two or three times until the circuit is pressurised and force the pads against the brake disc.
Repeat the operation for the right brake calliper (18).