Shimano BL-M4100 - Page 40

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MAINTENANCE
SHIMANO genuine mineral oil replacement
3. Remove the bleed screw and O-ring.
O-ring
Bleed screw
4. Install a bag and tube on the bleed boss/bleed nipple.
BR-M6100/BR-MT410
(1) Place a 3 mm hexagon wrench in the position shown in the figure.
(2) Remove the bleed boss cap, and connect a tube with bag to the bleed boss.
Bleed boss
Bleed screw