Shimano Ultegra R8050 Series Dealer's Manual page 94

INSTALLATION OF HYDRAULIC DISC BRAKE SYSTEM
Adding Shimano genuine mineral oil and bleeding air
(B)
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9
To be continued on next page
Set a 7 mm socket wrench in place.
Fill the syringe with sufficient oil,
connect the syringe tube to the bleed
nipple, and fasten it with the tube
holder so that the tube will not be
disconnected.
Loosen the bleed nipple by a 1/8 of a
turn to open it.
(A)
Once there are no more air bubbles in
the oil in the funnel, temporarily close
the bleed nipple.
Remove the syringe while covering the
end of the syringe tube with a waste
cloth to prevent oil from spattering.
94
(A)
Tube holder
(B)
Bleed nipple
NOTE
Secure the brake caliper in a vise to prevent
the tube from being accidentally
disconnected.
Do not depress and release the lever
repeatedly.
Oil without air bubbles may come out as a
result of such operation, but air bubbles may
remain in the oil inside the brake caliper, and
it will take longer to bleed the air. (If you
have depressed and released the lever
repeatedly, drain out all of the oil and then
add oil again.)