Shimano Ultegra R8050 Series Dealer's Manual page 87

INSTALLATION OF HYDRAULIC DISC BRAKE SYSTEM
Installation of the brake hose (easy hose joint system)
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If the brake lever is then operated, air bubbles in the system will rise up through the port
into the oil funnel.
Once the bubbles stop appearing, depress the brake lever as far as it will go.
Under the normal condition, the lever action should feel stiff at this point.
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Lever operation
(x)
To be continued on next page
Slowly apply and release the lever until
no more air bubbles are emitted.
(y)
87
(x)
Loose
(y)
Slightly stiff
(z)
Stiff
(z)