Yamaha XP500 Service Manual page 310

• [C-5-10] Malfunction code 41 (Front wheel does not recover from the locking tendency
even though the signal is continuously transmitted from the ECU (ABS) to release the
hydraulic pressure [when the battery voltage is normal].)
Check the following:
1) Rotation of the front wheel
• Check that there is no brake disc drag on the front wheel and make sure it rotates smoothly.
• Check the front wheel axle for loose bearings and bends, and the brake disc for distortion.
2) Brake master cylinder and brake caliper
• 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.
3) Brake fluid
• Visually check the brake fluid in the brake master cylinder reservoir and the fluid for water, for-
eign materials, solidification and contamination.
• Check for air in the brake hose lines.
4) Brake hose lines
• Check the brake hose lines for kinks and deterioration.
WARNING
_
Only use genuine Yamaha parts. Using other brake pipes, hoses and union bolts may close
the brake hose lines.
• Check that the connections of the brake hose lines from the brake master cylinder to the hydrau-
lic unit and to the front brake caliper from the hydraulic unit are correct.
WARNING
_
The front brake will not function properly if the connections are reversed.
• Front brake hose 1 inlet: from the front brake master cylinder
• Front brake hose 2 outlet: to the front brake caliper
NOTE:
_
• If the front brake hose inlet and outlet connections are reversed on the hydraulic unit, the brake
lever is pulled to full stroke without responding and will be pushed back slowly without pulsating
when the final check in [D-6] is performed.
• If the front and rear brake hose connections are reversed on the hydraulic unit, the pulsating
action in the brake levers will be performed in the reverse order when the final check in [D-6] is
performed.
ANTI-LOCK BRAKE SYSTEM (XP500A)
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CHAS