Disassembling The Rear Brake Caliper; Checking The Rear Brake Caliper; Assembling The Rear Brake Caliper - Yamaha 2009 YFM25RY Service Manual

EAS22600
DISASSEMBLING THE REAR BRAKE CALI-
PER
1. Remove:
• Brake caliper piston
• Brake caliper dust seal "1"
• Brake caliper piston seal "2"
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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.
• Never try to pry out the brake caliper pis-
ton.
b. Remove the brake caliper piston seal and
brake caliper dust seal.
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EAS22640

CHECKING THE REAR BRAKE CALIPER

Recommended brake component
replacement schedule
Brake pads
Piston seals
Brake hoses
Brake fluid
If necessary
Every two years
Every four years
Every two years and
whenever the brake is
disassembled
4-34
1. Check:
• Brake caliper piston "1"
Rust/scratches/wear → Replace the
brake caliper piston.
• Brake caliper cylinder "2"
Scratches/wear → Replace the brake cal-
iper 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.
EWA4D3F006
WARNING
Whenever a brake caliper is disassembled,
replace the brake caliper piston seal and
brake caliper dust seal.
2. Check:
• Brake caliper bracket
Cracks/damage → Replace.
EAS22660

ASSEMBLING THE REAR BRAKE CALIPER

EWA4D3F007
WARNING
• Before installation, all internal brake com-
ponents should be cleaned and lubricated
with clean or new brake fluid.
• Never use solvents on internal brake
components as they will cause the piston
seals to swell and distort.
• Whenever a brake caliper is disassem-
bled, replace the brake caliper piston seal
and brake caliper piston dust seal.
Recommended fluid
DOT 4
REAR BRAKE