Honda CBR125R Owner's Manual page 356

HYDRAULIC BRAKE
Place a shop towel over the piston.
Position the caliper body with the piston facing
Do not use high
down and apply small squirts of air pressure to the
pressure air or bring
fluid inlet to remove the piston.
the nozzle too close
to the inlet.
Push the dust and piston seals in and lift them out.
Be careful not to
damage the piston
Clean the seal grooves, caliper cylinder and piston
sliding surface.
with clean brake fluid.
INSPECTION
Check the caliper cylinder for scoring, scratches or
damage.
Measure the caliper cylinder I.D.
SERVICE LIMIT: 32.090 mm (1.2634 in)
Check the caliper piston for scoring, scratches or
damage.
Measure the caliper piston O.D.
SERVICE LIMIT: 31.940 mm (1.2575 in)
15-24
PISTON SEAL DUST SEAL