CHASSIS
3-15
EAM30232
CHECKING THE REAR BRAKE PADS
The following procedure applies to all of the
brake pads.
1. Operate the brake.
2. Check:
•
Rear brake pad
Wear indicator grooves “1” almost disap-
peared
Replace the brake pads as a set.
Refer to “REAR BRAKE” on page 4-7.
EAM30478
CHECKING THE FRONT BRAKE HOSE
1. Check:
•
Brake hose
Cracks/damage/wear
Replace.
2. Check:
•
Brake hose clamp
Loose connection
Tighten the clamp bolt.
3. Stand the vehicle upright and apply the front
brake several times.
4. Check:
•
Brake hose
Brake fluid leaks
Replace the damaged
brake hose.
EAM30498
CHECKING THE REAR BRAKE HOSE
1. Check:
•
Brake hose
Cracks/damage/wear
Replace.
2. Check:
•
Brake hose holder
Loose connection
Tighten the holder bolt.
3. Hold the vehicle upright and apply the rear
brake several times.
4. Check:
•
Brake hose
Brake fluid leakage
Replace the damaged
hose.
EAM30499
CHECKING THE BRAKE OPERATION
1. Check:
•
Brake operation
Brake not working properly
Check the
brake system.
TIP
Drive on the dry road, operate the front and rear
brakes separately and check to see if the brakes
are operating properly.
EAM30477
BLEEDING THE HYDRAULIC BRAKE
SYSTEM
WARNING
EWA19140
Bleed the brake system whenever:
• The system is disassembled.
• A brake hose is loosened, disconnected, or
replaced.
• The brake fluid level is very low.
• Brake operation is faulty.
1. Remove:
•
Brake master cylinder cap
•
Reservoir diaphragm
•
Reservoir float (front brake)
•
Protector (rear brake)
TIP
•
Be careful not to spill any brake fluid or allow
the reservoir to overflow.
•
Make sure that there is enough brake fluid be-
fore applying the brake. Ignoring this precau-
tion could allow air to enter the brake system,
considerably lengthening the bleeding proce-
dure.
•
If bleeding is difficult, it may be necessary to let
the brake fluid settle for a few hours. Repeat
the bleeding procedure when the tiny bubbles
in the hose have disappeared.
2. Bleed the brake system.
a. Fill the reservoir to the proper level with
the recommended brake fluid.
b. Install the reservoir diaphragm.
c. Connect the plastic hose “1” to the bleed
screw “2” securely, and place a container
under the end of the plastic hose.
1
1
Summary of Contents for YZ250 2021
Page 5: ...EAM20162 YAMAHA MOTOR CORPORATION U S A YZ MOTORCYCLE LIMITED WARRANTY ...
Page 6: ......
Page 8: ......
Page 10: ...MOTORCYCLE CARE AND STORAGE 1 16 CARE 1 16 STORAGE 1 17 ...
Page 42: ...TIGHTENING TORQUES 2 13 ...
Page 70: ...CHASSIS 3 26 ...
Page 106: ...CHAIN DRIVE 4 34 ...
Page 112: ...CLUTCH 5 5 ...
Page 113: ...1 2 3 4 5 6 7 8 9 10 ELECTRICAL SYSTEM WIRING DIAGRAM 6 1 COLOR CODE 6 1 ...
Page 128: ...TROUBLESHOOTING 7 13 ...
Page 146: ...CHASSIS 8 17 ...