Shimano Ultegra R8050 Series Dealer's Manual page 84

INSTALLATION OF HYDRAULIC DISC BRAKE SYSTEM
Installation of the brake hose (easy hose joint system)
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Remove the brake lever stopper.
(A)
Turn over the bracket cover from the
back side.
Adjust the position of the bleed screw so
that its surface is parallel to the ground.
84
(A)
Lever stopper
NOTE
After removing the lever stopper, check that
the pad spacer is installed on the caliper side
or that the caliper is installed to the bicycle
and the disc brake rotor is between the two
sides of the caliper, before depressing the
lever.
After installation to the bicycle, make sure to
check that the lever stopper is removed.
TECH TIPS
Move and pull on the lever stopper to remove
it while being careful not to depress the lever.
NOTE
When tilting, be careful not to forcibly pull on
the brake hose or electric wires.