Yamaha TT-R125LW Owner's Service Manual page 356

FRONT BRAKE
Brake caliper piston seal kit
1. Remove:
Brake caliper dust seal 1
Brake caliper piston seal 2
NOTE:
Remove the brake caliper piston seals and
brake caliper dust seals by pushing them with
a finger.
CAUTION:
Never attempt to pry out brake caliper pis-
ton seals and brake caliper dust seals.
WARNING
Replace the brake caliper piston seals and
brake caliper dust seals whenever a brake
caliper is disassembled.
INSPECTION
Brake master cylinder
1. Inspect:
Brake master cylinder inner surface a
Wear/scratches → Replace brake mas-
ter cylinder assembly.
Stains → Clean.
WARNING
Use only new brake fluid.
2. Inspect:
Diaphragm 1
Crack/damage → Replace.
3. Inspect:
Brake master cylinder piston 1
Brake master cylinder cup 2
Wear/damage/score marks → Replace
brake master cylinder kit.
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CHAS