Yamaha 2003 FJR1300, Service Manual

Page: 81 / 162

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CHAS
ANTI-LOCK BRAKE SYSTEM (FJR1300A)
2) Pressurized state
Port D
A
is closed by the “pressurization” signal transmitted from the ECU (ABS). Before this
occurs, the spool of the flow control valve has compressed the return spring to close port B
9
.
Brake fluid that has entered through port A
7
is further restricted by the orifice
0
and the brake
fluid is sent to the brake calipers via port A
7
and port C
C
. At this time, the brake is pressurized
at a constant speed regardless of the brake fluid pressure level since restriction of port A
7
changes so that a constant pressure difference is maintained between chamber A
J
and cham-
ber B
K
of the flow control valve.
1
Brake master cyl-
inder
2
Brake light switch
3
ABS motor
4
Pump
5
Buffer chamber
6
Flow control valve
7
Port A
8
Spool
9
Port B
0
Orifice
A
Port D
B
Solenoid valve
C
Port C
D
Brake caliper
E
ECU (ABS)
F
ABS warning light
G
Brake fluid pres-
sure
H
Time
I
Repressurizing
J
Chamber A
K
Chamber B