Introduction; Checking The Rear Brake Disc; Replacing The Rear Brake Pads - Yamaha XT250X 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-
G
less absolutely necessary.
If any connection on the hydraulic brake
G
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-
G
ponents.
Use only clean or new brake fluid for clean-
G
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
G
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 wheel
G
Refer to "REAR WHEEL" on page 4-8.
2. Check:
Rear brake disk
G
Damage/galling → Replace.
3. Measure:
Brake disc deflection
G
Out of specification → Correct the brake disc
deflection or replace the brake disc.
Refer to "CHECKING THE FRONT BRAKE
DISC" on page 4-17.
Brake disc deflection limit
0.15 mm (0.0059 in)
4. Measure:
Brake disc thickness
G
Measure the brake disc thickness at a few dif-
ferent locations.
Out of specification → Replace.
Refer to "CHECKING THE FRONT BRAKE
DISC" on page 4-17.
Brake disc thickness limit
4.0 mm (0.16 in)
5. Adjust:
Brake disc deflection
G
Refer to "CHECKING THE FRONT BRAKE
DISC" on page 4-17.
Brake disc bolt
28 Nm (2.8 m•kg, 21 ft•lb)
Apply
TITE®)
6. Install:
Rear wheel
G
Refer to "REAR WHEEL" on page 4-8.
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"
G
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. Lubricate:
Support pin
G
(Rear brake caliper or rear brake caliper
bracket)
Brake pad support bolt
G
4-29
REAR BRAKE
locking agent (LOC-
a