Shimano Ultegra R8050 Series Dealer's Manual page 105

INSTALLATION OF HYDRAULIC DISC BRAKE SYSTEM
Installing the brake caliper
2
Insert the brake caliper mounting bolts A
into the holes in the mount bracket first
and then temporarily attach the mount
bracket to the frame, as in the
illustration.
Depress the brake lever, and tighten the
brake caliper mounting bolts A while
(A)
pressing the brake pads against the disc
brake rotor.
105
(A)
Brake caliper mounting bolt A
Tightening torque
6 - 8 N·m
NOTE
•
Do not insert the brake caliper mounting
bolts A after placing the mount bracket on
to the surface of the frame.
The brake caliper may be scratched by the
mounting bolts.
•
Be sure to attach a snap ring when
installing the brake caliper mounting bolts
A.
*
The snap ring installation position is
different for 140 mm and 160 mm. (The
illustration shows a 160 mm disc brake
rotor.)
Snap ring