Shimano Ultegra R8050 Series Dealer's Manual page 95

INSTALLATION OF HYDRAULIC DISC BRAKE SYSTEM
Adding Shimano genuine mineral oil and bleeding air
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Operate the brake lever about 10 times.
Tie the supplied tube and bag with
rubber bands.
Set a 7 mm socket wrench as shown in
the illustration, and connect the tube to
the bleed nipple.
Loosen the bleed nipple.
At this point, make sure that the tube is
secured to the bleed nipple.
After a little while, the oil and air
bubbles will flow naturally from the
bleed nipple into the tube.
In this way it will be possible to easily
extract the greater part of the air
bubbles remaining inside the brake
system.
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95
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Bag
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Air bubbles
TECH TIPS
It may be effective to shake the brake hose
gently, to tap the lever bracket or brake
calipers gently with a screwdriver, or to move
the position of the calipers at this time.