Shimano Ultegra R8050 Series Dealer's Manual page 99

INSTALLATION OF HYDRAULIC DISC BRAKE SYSTEM
Adding Shimano genuine mineral oil and bleeding air
20
21
22
Plug the oil funnel with the oil stopper
(B)
so that the O-ring mounted side is facing
downward.
(A)
Remove the oil funnel and funnel
adapter while still plugged with the oil
stopper.
Attach the O-ring to the bleed screw and
tighten it while letting oil flow out so as
to make sure that no air bubbles remain
inside the reservoir tank.
Wipe away any oil which has flowed out.
99
(A)
O-ring
(B)
Oil stopper
Tightening torque
0.5 - 0.7 N·m
NOTE
•
Do not operate the brake lever. Otherwise,
air bubbles may enter the cylinder.
•
Use a waste cloth to prevent the oil from
flowing to surrounding areas.