Ducati MULTISTRADA 1200S ABS 2015 Workshop Manual page 552

Removing the rear brake control
Warning
The brake master cylinder manufacturer advises against servicing the brake master cylinder due to the safety
critical nature of this component. Incorrect overhaul can endanger rider and passenger safety. Maintenance
operations on these units are limited to replacement of the following parts: control lever, fluid reservoir assembly
and relative fasteners and master cylinder fasteners.
Drain the rear braking system
Disconnect rear stop switch (1) from main wiring.
Loosen rear brake master cylinder retaining screws (2).
Slide out rear brake master cylinder (3) from the adjusting rod (4), collect bracket (5) securing rear stop (1).
(Changing the front brake system fluid).