Checking/Replacing The Rear Brake Disc - Yamaha YZF-R25 Service Manual

EAS30183
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.
EAS30184
CHECKING THE REAR BRAKE DISC
1. Remove:
• Rear wheel
Refer to "REAR WHEEL" on page 4-24.
2. Check:
• Rear 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 4-35.
Brake disc runout limit (as mea-
sured on wheel)
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 4-35.
Brake disc thickness limit
4.0 mm (0.16 in)
5. Adjust:
• Brake disc deflection
Refer to "CHECKING THE FRONT BRAKE
DISC" on page 4-35.
Rear brake disc bolt
23 Nm (2.3 m·kgf, 17 ft·lbf)
LOCTITE®
6. Install:
• Rear wheel
Refer to "REAR WHEEL" on page 4-24.
EAS30185
REPLACING THE REAR 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. Measure:
• Brake pad wear limit "a"
Out of specification → Replace the brake
pads as a set.
Brake pad lining thickness (in-
ner)
7.7 mm (0.30 in)
Limit
0.8 mm (0.03 in)
Brake pad lining thickness (out-
er)
7.7 mm (0.30 in)
Limit
0.8 mm (0.03 in)
A
4-48
REAR BRAKE
a