Removing/Disassembling/Checking The Rear Brake Caliper - Yamaha YZF-R25 Service Manual

Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-14.
EAS30186
REMOVING THE REAR BRAKE CALIPER
TIP
Before disassembling the brake caliper, drain
the brake fluid from the entire brake system.
1. Remove:
• Rear brake hose union bolt "1"
• Brake hose gaskets "2"
• Brake hose "3"
TIP
Put the end of the brake hose into a container
and pump out the brake fluid carefully.
1
2
EAS30187
DISASSEMBLING THE REAR BRAKE
CALIPER
1. Remove:
• Brake caliper piston "1"
• Brake caliper piston dust seal "2"
• Brake caliper piston seal "3"
▼ ▼▼▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
a. Blow compressed air into the brake hose joint
opening "a" to force out the piston from the
brake caliper.
EWA13550
WARNING
• Cover the brake caliper piston with a rag.
Be careful not to get injured when the pis-
ton is expelled from the brake caliper.
3
1
2
3
▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼
• Never try to pry out the brake caliper pis-
ton.
b. Remove the brake caliper piston dust seal
and brake caliper piston seal.
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EAS30188
CHECKING THE REAR BRAKE CALIPER
Recommended brake component
Brake pads
Piston seal
Piston dust seal
Brake hoses
Brake fluid
1. Check:
• Brake caliper piston "1"
Rust/scratches/wear → Replace the brake
caliper piston.
• Brake caliper cylinder "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.
EWA17070
WARNING
▼▼▼
Whenever a brake caliper is disassembled,
replace the brake caliper piston dust seal
and brake caliper piston seal.
4-50
REAR BRAKE
▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲
replacement schedule
If necessary
Every two years
Every two years
Every four years
Every two years and
whenever the brake is
disassembled
a
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