Introduction; Checking The Rear Brake Disc; Replacing The Rear Brake Pads - Yamaha XG250 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 re-
assembly.
Never use solvents on internal brake com-
●
ponents.
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
DISC" on page 4-18.
Brake disc deflection limit
0.15 mm (0.0059 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
DISC" on page 4-18.
Brake disc thickness limit
4.0 mm (0.16 in)
5. Adjust:
Brake disc deflection
●
Refer to "CHECKING THE FRONT BRAKE
DISC" on page 4-18.
Brake disc bolt
28 Nm (2.8 m•kg, 20 ft•lb)
LOCTITE®
6. Install:
Rear wheel
●
Refer to "REAR WHEEL" on page 4-9.
EAS22580

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. Measure:
Brake pad wear limit "a"
●
Out of specification → Replace the brake
pads as a set.
Brake pad lining thickness (inner)
5.2 mm (0.20 in)
Limit
1.0 mm (0.04 in)
Brake pad lining thickness (outer)
5.2 mm (0.20 in)
Limit
1.0 mm (0.04 in)
2. Install:
Brake pad shims
●
(onto the brake pads)
Brake pads
●
4-31
REAR BRAKE
a