Rear Brake; Introduction; Checking The Rear Brake Disc; Replacing The Rear Brake Pads - Yamaha YFM70RY Service Manual

EAS22560

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.
EAS22570

CHECKING THE REAR BRAKE DISC

1. Remove:
• Rear wheels
Refer to "REAR WHEELS" 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 4-22.
Brake disc deflection limit
0.15 mm (0.006 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
DISCS" on page 4-22.
Brake disc thickness limit
3.0 mm (0.12 in)
5. Adjust:
• Brake disc deflection
Refer to "CHECKING THE FRONT BRAKE
DISCS" on page 4-22.
Brake disc bolt
33 Nm (3.3 m·kg, 24 ft·lb)
LOCTITE®
6. Install:
• Rear wheels
Refer to "REAR WHEELS" 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 disassem-
ble the brake caliper.
1. Remove:
• Brake pads
2. Measure:
• Brake pad wear limit "a"
Out of specification → Replace the brake
pads as a set.
Brake pad lining thickness (in-
ner)
5.3 mm (0.21 in)
Limit
1.0 mm (0.04 in)
Brake pad lining thickness (out-
er)
5.3 mm (0.21 in)
Limit
1.0 mm (0.04 in)
3. Install:
• Brake pad shims
(onto the brake pads)
• Brake pads
4-34

REAR BRAKE