12
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
21
Chamber A
22
Chamber B
ABS OUTLINE
GEN
INFO
2) Pressurized state
Port D
12
of solenoid valve closes according to the “increase pressure” signal from the electronic control
unit. Also, spool 9 of flow control valve compresses the return spring to close the port B
10
.
Brake fluid entered through port A 8 is further restricted by the orifice
11
.
Accordingly, the brake fluid in master cylinder is sent in the line of Port A 8 , Port C
14
then to the brake
caliper. However, the brake is pressurized at a constant speed regardless of the brake fluid pressure
level since the port A’s 8 restriction changes so that the constant pressure difference is maintained be-
tween A
21
and B
22
chambers of flow control valve.
