Abs Operation - Yamaha 2013 FJR1300AS Service Manual

ET3P61052

ABS OPERATION

The ABS hydraulic circuit consists of two systems: the front wheel, and rear wheel. The following de-
scribes the system for the front wheel only, excluding the unified brake system.
Normal braking (ABS not activated)
When the ABS is not activated, the inlet solenoid valve is open and the outlet solenoid valve is closed
because a control signal has not been transmitted from the ABS ECU. Therefore, when the brake lever
is squeezed, the hydraulic pressure in the brake master cylinder increases and the brake fluid is sent
to the brake caliper.
At this time, the inlet and outlet check valves of the hydraulic pump are closed. As a result of eliminating
the orifice, the brake master cylinder directly pressurizes the brake caliper during normal braking. When
the brake lever is released, the brake fluid in the brake caliper returns to the brake master cylinder.
8
12
1. Brake master cylinder
2. Brake light switch
3. ABS motor
4. Hydraulic pump
5. Buffer chamber
6. Outlet solenoid valve
7. Inlet solenoid valve
8. Brake caliper
9. Wheel sensor
10. ABS ECU
11. ABS warning light
7
9
13
3
4
6
10
11
12. Brake fluid pressure
13. Time
1-29
FEATURES
5