Honda C8R600F4 Service Manual page 301

Place a shop towel over the piston.
Position the caliper body with the piston down and
apply small squirts of air pressure to the fluid inlet
to remove the piston.
Do not use high pressure air or bring the nozzle
too close to the inlet.
Push the dust seal and piston seal in and lift them
out.
CAUTION:
Be careful not to damage the piston sliding surface.
Clean the seal grooves, caliper cylinder and piston
with clean brake fluid.
INSPECTION
Check the caliper cylinder and piston for scoring,
scratches or damage.
Measure the caliper cylinder l.D.
SERVICE LIMIT: 38.24 mm (1.506 in)
Measure the caliper piston 0.D.
SERVICE LIMIT: 38.09 mm (1.500 in)
HYDRAULIC BRAKE
15-21