Introduction; Checking The Rear Brake Disc; Replacing The Rear Brake Pads - Yamaha 2009 YFM25RY Service Manual

EAS22560

INTRODUCTION

EWA14100
WARNING
Disc brake components rarely require dis-
assembly. Therefore, always follow these
preventive measures:
• Never disassemble brake components
unless 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
reassembly.
• Never use solvents on internal brake
components.
• Use only clean or new brake fluid for
cleaning 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
immediate medical attention.
EAS22570

CHECKING THE REAR BRAKE DISC

1. Remove:
• Rear wheel
Refer to "REAR WHEEL" on page 4-9.
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 DISCS" on page 4-20.
Brake disc deflection limit
0.15 mm (0.006 in)
4. Measure:
• Brake disc thickness
Measure the brake disc thickness at a
few different locations.
Out of specification → Replace.
Refer to "CHECKING THE FRONT
BRAKE DISCS" on page 4-20.
Brake disc thickness limit
3.5 mm (0.14 in)
5. Adjust:
• Brake disc deflection
Refer to "CHECKING THE FRONT
BRAKE DISCS" on page 4-20.
Brake disc bolt
28 Nm (2.8 m·kg, 21 ft·lb)
LOCTITE®
6. Install:
• Rear wheel
Refer to "REAR WHEEL" on page 4-9.
EAS22580

REPLACING THE REAR BRAKE PADS

TIP
When replacing the brake pads, it is not neces-
sary to disconnect the brake hose or disas-
semble the brake caliper.
1. Measure:
• Brake pad wear limit "a"
Out of specification → Replace the brake
pads as a set.
Brake
(inner)
4.2 mm (0.17 in)
Limit
1.0 mm (0.04 in)
Brake
(outer)
4.2 mm (0.17 in)
Limit
1.0 mm (0.04 in)
2. Install:
• Brake pads
• Brake pad spring
TIP
Always install new brake pads and a brake pad
spring as a set.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Connect a clear plastic hose "1" tightly to
the bleed screw "2". Put the other end of
the hose into an open container.
4-32
REAR BRAKE
pad lining thickness
pad lining thickness