Checking The Front Brake Discs; Introduction - Yamaha R1 Series 2015 Service Manual

EAS30168

INTRODUCTION

EWA14101
WARNING
Disc brake components rarely require disas-
sembly. Therefore, always follow these pre-
ventive 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 reas-
sembly.
• Never use solvents on internal brake com-
ponents.
• Use only clean or new brake fluid for clean-
ing 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 im-
mediate medical attention.
EAS30169

CHECKING THE FRONT BRAKE DISCS

The following procedure applies to both brake
discs.
1. Remove:
• Front wheel
Refer to "FRONT WHEEL" on page 4-24.
2. Check:
• Front brake disc
Damage/galling
3. Measure:
• Brake disc runout
Out of specification
runout or replace the brake disc.
Brake disc runout limit (as mea-
sured on wheel)
0.10 mm (0.0039 in)
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a. Place the vehicle on a suitable stand so that
the front wheel is elevated.
b. Before measuring the brake disc runout, turn
the handlebar to the left or right to ensure that
the front wheel is stationary.
c. Remove the brake caliper.
Replace.
Correct the brake disc
d. Hold the dial gauge at a right angle against
the brake disc surface.
e. Measure the runout 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 dif-
ferent locations.
Out of specification
Brake disc thickness limit
4.5 mm (0.18 in)
5. Adjust:
• Brake disc runout
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a. Remove the brake disc.
b. Rotate the brake disc by one bolt hole.
c. Install the brake disc.
Front brake disc bolt
17 Nm (1.7 m·kgf, 12 ft·lbf)
LOCTITE®
ECA19150
NOTICE
Replace the brake disc bolts with new ones.
TIP
Tighten the brake disc bolts in stages and in a
crisscross pattern.
4-48
FRONT BRAKE
Replace.