Honda Accord 2008 Manual page 1484

07/11/02 09:34:54 61TA0000_190_0063
Modulator Unit
The modulator unit consists of the inlet solenoid valve, the outlet solenoid valve, the VSA NO (normally open)
solenoid valve, the VSA NC (normally closed) solenoid valve, the reservoir, the pump, and the pump motor.
The hydraulic control has three modes of ABS action; pressure intensifying, pressure retaining, and pressure reducing.
Pressure intensifying mode (VSA) is a combination of the TCS, VSA, and brake assist action.
The hydraulic circuit is an independent four channel type; one channel for each wheel.
＊１０
Mode
Pressure
intensifying
mode
Pressure
retaining
mode
Pressure
reducing
mode
Pressure
intensifying
mode (VSA)
: The motor will continue running until the operation of the one anti-lock brake control is finished with the first
pressure reducing mode.
RR FL
OUT OUT
IN IN
VSA NO VSA NC
RESERVOIR
VSA NO VSA NC
Valve Valve
open closed
open closed
open closed
closed open
MASTER
MASTER
CYLINDER
CYLINDER
PRESSURE
SENSOR
ORIFICE
MOTOR
RESERVOIR
IN: INLET SOLENOID VALVE (NORMALLY OPEN)
OUT: OUTLET SOLENOID VALVE (NORMALLY CLOSED)
Inlet Outlet
Solenoid Solenoid
Valve Valve
open closed Master cylinder fluid is pumped out to
the caliper.
closed closed Caliper fluid is retained by the inlet
and outlet valves.
closed open •
•
open closed •
•
FR RL
OUT OUT
IN IN
VSA NC VSA NO
Brake Fluid
Caliper fluid flows through the
outlet valve to the reservoir.
The motor pumps the reservoir fluid
through the damping chamber to
the master cylinder .
Master cylinder fluid is pumped out
by pump with motor through VSA
NC valve to the caliper.
Caliper fluid pressure exceeds
master cylinder pressure.
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