Hope Tech C2 Brake - Manual (Page 17)

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For the XC4 and DH4 calipers (2 pistons per caliper half) you should try to eject the
pistons simultaneously. If one piston is moving faster than the other then apply
finger pressure to one piston to allow the other to catch up.
6. Clean the piston. The new caliper half will include a new piston seal. Wipe the
inside of the bore with clean brake fluid and gently push the piston into it. For the
DH4 and Open 2 caliper the piston will push all the way to the bottom.
For the XC4 and Closed 2 caliper push the piston until it locates on the screw thread
and screw the piston into the bore. Caution : do not over tighten or you will strip the
thread and severely damage the caliper half and piston.
7. Using the new ‘O’ ring transfer port seal provided with the new caliper half place the
two halves together and gently tighten. Replace the caliper on the fork/frame and
fully tighten the caliper half bolts to the correct torque.
8. Re bleed the system (section 3.3).
3.7. Torque settings
Hose connector 8 Nm
Pistons (Closed 2 and XC4) 2 Nm
M6 bolts 8 Nm
M5 bolts 4 Nm