Yamaha YZFR1W 2007, Service Manual

Page: 147 / 429

FRONT BRAKE
4-25
EAS22220
INTRODUCTION
WARNING
EWA14100
Disc brake components rarely require dis-
assembly. Therefore, always follow these
preventive measures:
• Never disassemble brake components
unless absolutely necessary.
• If any connection on the hydraulic brake
system is disconnected, the entire brake
system must be disassembled, drained,
cleaned, properly filled, and bled after
reassembly.
• Never use solvents on internal brake
components.
• Use only clean or new brake fluid for
cleaning brake components.
• Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean
up any spilt brake fluid immediately.
• Avoid brake fluid coming into contact
with the eyes as it can cause serious
injury.
• FIRST AID FOR BRAKE FLUID ENTERING
THE EYES:
• Flush with water for 15 minutes and get
immediate medical attention.
EAS22240
CHECKING THE FRONT BRAKE DISCS
The following procedure applies to both brake
discs.
1. Remove:
• Front wheel
Refer to "FRONT WHEEL" on page 4-8.
2. Check:
• Brake disc
Damage/galling
→
Replace.
3. Measure:
• Brake disc deflection
Out of specification
→
Correct the brake
disc deflection or replace the brake disc.
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a. Place the vehicle on a suitable stand so
that the front wheel is elevated.
b. Before measuring the front brake disc
deflection, turn the handlebar to the left or
right to ensure that the front wheel is sta-
tionary.
c. Remove the brake caliper.
d. Hold the dial gauge at a right angle against
the brake disc surface.
e. Measure the deflection 1.5 mm (0.06 in)
below the edge of the brake disc.
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4. Measure:
• Brake disc thickness
Measure the brake disc thickness at a few
different locations.
Out of specification
→
Replace.
5. Adjust:
• Brake disc deflection
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a. Remove the brake disc.
b. Rotate the brake disc by one bolt hole.
c. Install the brake disc.
NOTE:
Tighten the brake disc bolts in stages and in a
crisscross pattern.
Brake disc deflection limit
0.10 mm (0.0039 in)
Brake disc thickness limit
4.5 mm (0.18 in)