10
1
Brake master
cylinder
2
Brake switch
3
Silencer chamber
4
Motor
5
Pump
6
Buffer chamber
7
Flow control valve
8
Port A
9
Spool
10
Port B
11
Orifice
12
Port D
13
Solenoid valve
14
Port C
15
Brake caliper
16
Electronic control
unit
17
ABS warning light
18
Brake fluid pressure
19
Time
20
Repressurizing
ABS OUTLINE
GEN
INFO
SYSTEM OPERATION
ABS system’s fluid pressure circuit has the 2 lines of front wheel and rear wheel systems. In this section, we
describe about one system of a front wheel.
Normal brake (ABS not activated)
Port D
12
of the solenoid valve is closed since the control signal from the electronic control unit is not sent to
the hydraulic unit. A 8 and B
10
ports of flow control valve spool are opened.
Accordingly, when a rider apply the brake lever and the master cylinder hydraulic pressure rises, the brake
fluid is directed in the line from Port A 8 to Port B
10
then to brake caliper.
At this time, inlet and outlet check valves of pump close the lines and brake fluid is not sent. Therefore, mas-
ter cylinder directly pressurizes the brake caliper while braking normally.
When the brake lever is released next, the brake fluid in the brake caliper returns then to the master cylinder
via Port B
10
, Port A 8 .
