FRONT BRAKE
4-15
EAM30028
INTRODUCTION
WARNING
EWA19210
If you need to disassemble the disc brake
components, observe the following precau-
tions.
• Never disassemble the brake components
unless absolutely necessary.
• If there is any problem with connections on
the hydraulic brake system, perform the
following jobs. Disassemble the brake sys-
tem, drain the brake fluid, and clean it. After
that, add a suitable amount of brake fluid.
Then, bleed it after reassembly.
• Use only brake fluid for washing brake
components.
• Use new brake fluid for cleaning the brake
components.
• Immediately wipe off the spilled brake fluid
to avoid damage to painted surfaces or
plastic parts.
• Handle brake fluid with special care not to
let it enter your eyes so that you may not
lost your eyesight.
• FIRST AID FOR BRAKE FLUID ENTERING
THE EYES:
• Flush with water for 15 minutes and get im-
mediate medical attention.
EAM30029
CHECKING THE FRONT BRAKE DISC
1. Check:
•
Front brake disc
Damage/galling
Replace.
2. Measure:
•
Brake disc thickness
Measure the brake disc thickness at a few dif-
ferent locations.
Out of specification
Replace.
3. Measure:
•
Brake disc runout
Out of specification
Correct the brake disc
runout or replace the brake disc.
a. Place the vehicle on a maintenance stand
so that the front wheel is elevated.
b. Remove the brake caliper.
c. Hold the dial gauge at a right angle against
the brake disc surface.
d. Measure the runout 1.5 mm (0.06 in)
above the brake disc edge.
4. Adjust:
•
Brake disc runout
a. Remove the front wheel.
Refer to “FRONT WHEEL” on page 4-3.
b. Remove the brake disc.
c. Rotate the brake disc by one bolt hole.
d. Install the brake disc.
TIP
Tighten the brake disc bolts in stages and in a
crisscross pattern.
e. Measure the brake disc runout.
f. If out of specification, repeat the adjust-
ment steps until the brake disc runout is
within specification.
g. If the brake disc runout cannot be brought
within specification, replace the brake
disc.
h. Install the front wheel.
Refer to “FRONT WHEEL” on page 4-3.
EAM30519
REPLACING THE FRONT BRAKE PADS
TIP
When replacing the brake pads, it is not neces-
sary to disconnect the brake hose or disassem-
ble the brake caliper.
1. Remove:
•
Brake pad
a. Remove the pad pin plug “1”.
Brake disc thickness limit
2.5 mm (0.10 in)
Brake disc runout limit (as mea-
sured on wheel)
0.15 mm (0.0059 in)
Front brake disc bolt
12 N·m (1.2 kgf·m, 8.9 lb·ft)
LOCTITE®
G098641
T
R
.
.
Summary of Contents for YZ125X 2021
Page 5: ...EAM20162 YAMAHA MOTOR CORPORATION U S A YZ MOTORCYCLE LIMITED WARRANTY ...
Page 8: ......
Page 10: ......
Page 38: ...MOTORCYCLE CARE AND STORAGE 1 26 ...
Page 54: ...CABLE ROUTING DIAGRAM 2 15 EAM20152 CABLE ROUTING DIAGRAM Frame and engine left side view ...
Page 56: ...CABLE ROUTING DIAGRAM 2 17 Frame and engine right side view ...
Page 58: ...CABLE ROUTING DIAGRAM 2 19 Handlebar front view 0 in 0 mm 0 mm 0 in ...
Page 60: ...CABLE ROUTING DIAGRAM 2 21 Rear brake right side view ...
Page 62: ...CABLE ROUTING DIAGRAM 2 23 ...
Page 158: ...CHAIN DRIVE 4 66 ...
Page 202: ...CRANKSHAFT 5 42 seal lip 4 1 2 3 M ...
Page 226: ...CARBURETOR 7 11 ...
Page 231: ...ELECTRICAL COMPONENTS 8 4 EAM30289 CHECKING THE SWITCHES 1 1 Engine stop switch ...
Page 236: ...ELECTRICAL COMPONENTS 8 9 ...
Page 250: ...TROUBLESHOOTING 9 13 ...
Page 268: ......