Checking The Front Brake Disc - Yamaha XT660R S Service Manual

FRONT WHEEL AND BRAKE DISC
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EAS00527

CHECKING THE FRONT BRAKE DISC

1. Check:
• brake disc
Damage/galling → Replace.
2. Measure:
• brake disc deflection
Out of specification → Correct the brake
disc deflection or replace the brake disc.
Brake disc deflection limit (maxi-
mum)
0.15 mm (0.006 in)
M MMM M MMM M M MMM M
a. Place the motorcycle 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 3.0 mm (0.12 in)
below the edge of the brake disc.
L LLL L LLL L L LLL L
3. Measure:
• brake disc thickness
Measure the brake disc thickness at a few
different locations.
Out of specification → Replace.
Brake disc thickness limit (mini-
mum)
4.0 mm (0.16 in)
CHAS
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
MMM
LLL