Introduction; Checking The Front Brake Discs - Yamaha MT-03 Service Manual

EAS22220

INTRODUCTION

EWA14100
WARNING
Disc brake components rarely require dis-
assembly. Therefore, always follow these
preventive measures:
• Never disassemble brake components un-
less 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 re-
assembly.
• Never use solvents on internal brake com-
ponents.
• 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 4-6.
2. Check:
• Brake disc
Damage/galling
3. Measure:
• Brake disc deflection
Out of specification
deflection or replace the brake disc.
Brake disc deflection limit
0.10 mm (0.0039 in)
a. Place the vehicle on a suitable stand so that
the front wheel is elevated.
b. Before measuring the front brake disc de-
flection, turn the handlebar to the left or right
to ensure that the front wheel is stationary.
Replace.
Correct the brake disc
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) be-
low the edge of the brake disc.
4. Measure:
• Brake disc thickness
Measure the brake disc thickness at a few
different locations.
Out of specification
Brake disc thickness limit
4.5 mm (0.18 in)
5. Adjust:
• Brake disc deflection
a. Remove the brake disc.
b. Rotate the brake disc by one bolt hole.
c. Install the brake disc.
Front brake disc bolt
18 Nm (1.8 m·kg, 13 ft·lb)
LOCTITE
NOTE:
Tighten the brake disc bolts in stages and in a
crisscross pattern.
4-23
FRONT BRAKE
Replace.
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