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@dancing james
had been looking for this but it was not on this thread, it was hidden on the Di2 thread instead.
@alb posted this a while ago
"Got shown a neat trick that improves lever throw (shortens it) on both ST-RS685/ST-RS785:
Un-screw free-stoke adjustment screw almost fully. Remove bleed screw and add reservoir topped with oil.
If it's a brand new install then bleed the system as normal until no air bubbles in either syringe or rising up through the bleed reservoir at the lever end. Close system @ caliper end remove syringe but leave bleed reservoir topped with oil in place. (if already bled got to No.4)
Clean caliper and add pads (leave the wheel/rotor out)
Cycle the pistons out by squeezing the lever a few times (without the rotor/wheel fitted). Use a piston press or clean (careful not to contaminate pads) flat head screwdriver to reset pistons each time. Check both pistons are moving freely with equal movement. Repeat 3-4 times. Air can be trapped behind the pistons - this effectively 'burps' them - you'll likely get a big ol' air bubble escaping up through the bleed reservoir on first go.
With bleed reservoir still in place slowly wind-in the free-stoke adjustment screw whilst flicking the lever blade. You should get tiny air bubbles escaping as the air is forced out/screw wound-in.
Remove bleed reservoir replace bleed screw closing the system
Re-fit wheel/rotor. Set brake"