Honda CRF450R 2009 Service Manual page 509

Place a shop towel under the caliper to cushion the
piston when it is expelled.
HYDRAULIC BRAKE
Do
not
bring the air
Apply short bursts of air pressure to the fluid inlet to
nozzle
100
close
10 remove the pistons.
the inial
or
Ihe
pistons may be
forced oul wilh
excessive force Ihal
could cause injury.
Be
careful
not 10
damage the piston
sliding surface.
Push the dust seals and piston seals in, and lift them
~""""""~=========;;~~~~~l
out.
Clean the seal grooves, caliper pistons and caliper
piston sliding surfaces with clean brake fluid.
INSPECTION
OUST
Check the caliper cylinder for scoring . scratches or , - - - - - - - - - - - - - - - - - - - ,
damage .
Measure the caliper cylinder 1.0.
SERVICE LIMIT:
27.060 mm (1.0654 in)
Check the caliper pistons for scoring, scratches or
~=================~
damage .
Measure the caliper piston 0.0.
SERVICE LIMIT: 26.853 mm (1 .0572 In)
16-23