Yamaha YZ450FA Automobile User Manual


 
5-14
FRONT BRAKE AND REAR BRAKE
Remove the brake caliper piston seals and
brake caliper piston dust seals by pushing them
with a finger.
Never attempt to pry out brake caliper pis-
ton seals and brake caliper piston dust
seals.
Replace the brake caliper piston seals and
brake caliper piston dust seals whenever a
caliper is disassembled.
A. Front
B. Rear
CHECKING THE BRAKE MASTER
CYLINDER
1. Inspect:
• Brake master cylinder inner surface "a"
Wear/scratches Replace master cylinder
assembly.
Stains Clean.
Use only new brake fluid.
A. Front
B. Rear
2. Inspect:
• Diaphragm "1"
Crack/damage Replace.
A. Front
B. Rear
3. Inspect: (front brake only)
• Reservoir float "1"
Damage Replace.
4. Inspect:
• Brake master cylinder piston "1"
• Brake master cylinder cup "2"
Wear/damage/score marksReplace brake
master cylinder kit.