Yamaha TMAX 2020 Service Manual page 664

EAS20694
41_ABS
EAS33331
TROUBLESHOOTING
Item
Front wheel ABS (intermittent wheel speed pulses or incorrect depressurization)
Procedure
1. Incorrect installation of the front wheel sensor
• Check the components for looseness, distortion, and bends.
Refer to "MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR" on page 4-
26.
Is check result OK?
YES
 Go to step 2.
NO
 Repair or replace the defective part.
2. Incorrect rotation of the front wheel
• Check that there is no brake disc drag on the wheel and make sure that it rotates smoothly.
Refer to "CHECKING THE FRONT WHEEL" on page 4-24 and "CHECKING THE FRONT BRAKE
DISCS" on page 4-43.
Is check result OK?
YES
 Go to step 3.
NO
 Repair or replace the defective part.
3. Front brake dragging
• Check that the brake fluid pressure is correctly transmitted to the brake caliper when the brake lever
is operated and that the pressure decreases when the lever is released.
Refer to "CHECKING THE FRONT BRAKE DISCS" on page 4-43.
Is check result OK?
YES
 Go to step 4.
NO
 Repair or replace the defective part.
4. Defective hydraulic unit assembly
• Replace the hydraulic unit assembly.
Refer to "ABS (Anti-lock Brake System)" on page 4-67.
9-190
41_ABS