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Ducati recommend pushing the pistons back into the calipers before bleeding the master cylinders.
From the 1200R manual:
Bleeding of the ABS hydraulic system
If brake controls feel "spongy" due to the presence of air bubbles in the system, bleed as usual, as described in
sections "Changing the front brake system fluid" and "Changing the rear brake system fluid".
Before bleeding a brake master cylinder, move back the caliper pistons as indicated in (Changing the fluid in the front
brake system,Changing the fluid in the rear brake system) to let any air build-up in the ABS control unit flow into the
master cylinder.
Purge must be carried out by means of the corresponding unions (A) placed on the calipers and the brake master cylinders.
Important
Do not undo the special screws securing the pipe unions on the ABS hydraulic control unit, unless control unit
replacement is necessary.
Important
If the ABS hydraulic control unit has been replaced, it will be supplied with the secondary circuit already filled with
fluid. Control unit must thus be assembled and the system filled and drained as a traditional system.
Which is way better than some systems, for instance recent fireblades need connecting to Honda diagnostics and then you spend a couple of hours running round the bike with the drain bottle and topping up reservoirs as the computer pumps fluid to various locations.
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