Yamaha 2008 Fazer FZ1-N Service Manual page 494

Malfunction code 42 (Rear wheel not recover from the locking tendency even though the sig-
nal is continuously transmitted from the ABS ECU to release the hydraulic state [when the
battery voltage is normal].)
Check the following:
1. Rotation of the rear wheel
• Check that there is no brake drag on the rear wheel and make sure it rotates smoothly.
• Check for brake disc distortion.
2. Brake master cylinder and brake caliper
• Check that the brake fluid pressure is correctly transmitted to the brake disc when the brake
pedal is operated and that the pressure decreases when the pedal is released.
3. Brake fluid
• Visually check the brake fluid in the brake master cylinder reservoir and check the fluid 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 (particularly between the hydraulic unit
and the rear brake caliper).
EWA4S81011
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
hydraulic unit and to the rear brake caliper from the hydraulic unit are correct.
EWA4S81012
WARNING
The rear brake will not function properly if the connections are reversed.
• Rear brake hose "1" inlet: from the rear brake master cylinder
• Rear brake hose "2" outlet: to the rear brake caliper
NOTE:
• If the rear brake hose inlet and outlet connections are reversed on the hydraulic unit, the brake
pedal is pressed down to full stroke without responding and will be pushed back slowly without
pulsating when the final check 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 is
performed.
5. Hydraulic unit solenoid coupler terminal
• Check if the front and rear hydraulic unit solenoid coupler terminals (hydraulic unit and wire
harness [ABS]) are reversed.
ABS (ANTI-LOCK BRAKE SYSTEM)
8-125