Checking The Brake Disc - Yamaha YBR125ED 2005 Service Manual

FRONT WHEEL AND BRAKE DISC
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EAS00527

CHECKING THE 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 (0.0059 in)
M MMM M MMM M M MMM M
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 17 mm (0.67 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)
3.5 mm (0.14 in)
CHAS
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
MMM
LLL