Ducati MONSTER 821 Workshop Manual page 479

Refit the airbox and the throttle body (Refitting the airbox and throttle
body).
Refit the fuel tank (Refitting the fuel
tank).
Refit the seat (Refitting the
seat).
Fill and bleed the brake system (Changing the fluid in the front brake
system, Changing the fluid in the rear brake
system).
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