ABS (ANTI-LOCK BRAKE SYSTEM)
8-138
2. Brake master cylinder and brake caliper
• Check that the brake fluid pressure is correctly transmitted to the brake calipers 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 brake fluid reservoir for
water, foreign 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
EW3P61005
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 hydraulic
unit and from the hydraulic unit to the front brake calipers and the metering valve are correct.
WARNING
EW3P61006
The front brakes will not function properly if the connections are incorrect.
• Brake hose “1” inlet: from the front brake master cylinder to the hydraulic unit
• Brake hose “2” outlet: from the hydraulic unit to the front brake calipers
• Brake hose “3” outlet: from the hydraulic unit to the metering valve
NOTE:
• If the brake hose inlet and outlet connections are incorrect on the hydraulic unit, the brake lever will
be pulled to its full-stroke position without responding, and then it will be pushed back slowly without
pulsating when the final check on page “[D-3] FINAL CHECK” on page 8-144 is performed.
• If the front and rear brake hose connections are reversed on the hydraulic unit, the pulsating action in
the brake lever and brake pedal will be performed in the reverse order when the final check on page
“[D-3] FINAL CHECK” on page 8-144 is performed.
• If the brake hoses (to the proportioning valve and the metering valve) are switched during assembly,
the brakes will continue to operate as normal. However, the reduction of the hydraulic pressure for the
rear brake and part of the right front brake will be reversed during the ABS operation when the final
check on page “[D-3] FINAL CHECK” on page 8-144 is performed.
5. Hydraulic unit solenoid coupler terminals
• Check if the front brake, rear brake, and unified brake system solenoid coupler terminals (hydraulic
unit and ABS wire harness) are connected correctly.
Terminal color
Solenoid ABS wire harness
Front brake white, white red/white, white/blue
Rear brake green, green red/white, white/green
Unified brake system red, red red/white, white/yellow
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