Honda CRF450R 2009 Service Manual page 502

HYDRAULIC BRAKE
16·16
Remove the washer, master piston and spring.
Clean the inside of the cylinder and reservoir with brake
fluid.
INSPECTION
Check the master cylinder for abnormal scratches.
Check the master piston for abnormal scratches.
Check the primary cup and secondary cup for fatigue or
damage.
Replace the master piston, primary cup and secondary
cup as an assembly
jf
necessary.
Measure the master cylinder 1.0.
SERVICE LIMIT: 11.050 mm (0.4350 in)
Measure the master piston 0 .0 .
SERVICE LIMIT:
10.840 mm (0.4268
In)
Check the brake lever for bends or damage.
Move the knocker arm with your finger.
The knocker arm should move smoothly and
without excessive play.
freely
Replace the brake lever and knocker arm as an
assembly
if
necessary.
c
MASTER PISTON
MASTER CYUNDER CUPS
BRAKE LEVER
KNOCKER ARM