Introduction; Checking The Rear Brake Disc; Replacing The Rear Brake Pads - Yamaha YZF-R125 Service Manual

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INTRODUCTION

EWA14100
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.
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CHECKING THE REAR BRAKE DISC

1. Remove:
• Rear wheel
Refer to "REAR WHEEL" on page 4-12.
2. Check:
• Brake disc
Damage/galling → Replace.
3. Measure:
• Brake disc deflection
Out of specification → Correct the brake disc
deflection or replace the brake disc.
Refer to "CHECKING THE FRONT BRAKE
DISC" on page 4-21.
Brake disc deflection limit
0.15 mm (0.0059 in)
4. Measure:
• Brake disc thickness
Measure the brake disc thickness at a few dif-
ferent locations.
Out of specification → Replace.
Refer to "CHECKING THE FRONT BRAKE
DISC" on page 4-21.
Brake disc thickness limit
3.5 mm (0.14 in)
5. Adjust:
• Brake disc deflection
Refer to "CHECKING THE FRONT BRAKE
DISC" on page 4-21.
Rear brake disc bolt
18 Nm (1.8 m·kg, 13 ft·lb)
LOCTITE®
6. Install:
• Rear wheel
Refer to "REAR WHEEL" on page 4-12.
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REPLACING THE REAR BRAKE PADS

NOTE:
When replacing the brake pads, it is not neces-
sary to disconnect the brake hose or disassem-
ble the brake caliper.
1. Remove:
• Brake pads
• Brake pad spring
NOTE:
To remove the inner brake pad "1", push down
on the brake caliper bracket so that there is
space to remove the brake pad.
2. Measure:
• Brake pad wear limit "a"
Out of specification → Replace the brake
pads as a set.
4-33
REAR BRAKE
1