Yamaha XT250X 2008, Service Manual

Page: 115 / 282

REAR BRAKE
4-31
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a. Blow compressed air into the brake hose joint
opening “a” to force out the piston from the
brake caliper.
WARNING
EWA13560
●
Cover the brake caliper pistons with a rag.
Be careful not to get injured when the pis-
tons are expelled from the brake caliper.
●
Never try to pry out the brake caliper pis-
tons.
b. Remove the brake caliper piston seal and
dust seal.
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EAS22640
CHECKING THE REAR BRAKE CALIPER
1. Check:
●
Brake caliper pistons “1”
Rust/scratches/wear
→
Replace the brake
caliper pistons.
●
Brake caliper cylinders “2”
Scratches/wear
→
Replace the brake caliper
assembly.
●
Brake caliper body “3”
Cracks/damage
→
Replace the brake caliper
assembly.
●
Brake fluid delivery passages
(brake caliper body)
Obstruction
→
Blow out with compressed air.
WARNING
EWA13610
Whenever a brake caliper is disassembled,
replace the brake caliper piston seals.
2. Check:
●
Brake caliper brackets “1”
Cracks/damage
→
Replace.
EAS22650
ASSEMBLING THE REAR BRAKE CALIPER
WARNING
EWA13620
●
Before installation, all internal brake com-
ponents should be cleaned and lubricated
with clean or new brake fluid.
●
Never use solvents on internal brake com-
ponents as they will cause the piston seals
to swell and distort.
●
Whenever a brake caliper is disassembled,
replace the brake caliper piston seals.
EAS22670
INSTALLING THE REAR BRAKE CALIPER
1. Install:
●
Rear brake caliper
●
Rear brake caliper bracket
2. Rear wheel
(temporarily)
Refer to “REAR WHEEL” on page 4-8.
3. Install:
●
Copper washer “1”
●
Brake hose joint “2”
●
Locknut “3”
●
Rear brake hose “4”
Recommended brake component
Replacement schedule
Brake pads If necessary
Piston seal/dust seal Every two years
Brake hoses Every four years
Brake fluid
Every four years and
whenever the brake is dis-
assembled
a
Recommended fluid
DOT 4
3
1
2
New
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