Acura 2002 RSX Service Manual page 951

ABS Gomponents
System Description (cont'dl
ABS Modulator
The ABS modulator consists of the inlet solenoid valve. outlet solenoid valve, reservoir. pump, and the pump motor.
The modulator reduces the caliper fluid pressure directly. lt is a circulating-type modulator beca use the brakefluid
circulates through the caliper, reservoir, and the master cylinder. The hydraulic control has three modes: pressure
intensifying, pressure retaining, and pressure reducing. The hydraulic circuit is an independent four channel type, one
channel for each wheel.
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Pressure intensifying mode: Inlet valve open, outlet valve closed
Master cylinder fluid is pumped out to the caliper.
Pressure retaining mode: Inlet valve closed, outlet valve closed
Caliper fluid is retained by the inlet valve and outlet valve.
Pressure reducing mode:
Inlet valve closed, outlet valve open
Caliper fluid flows through the outlet valve to the reservoir.
Motor operation mode: When starting the pressure reducing mode, the pump motor is ON.
When stopping ABS operation, the pump motor is OFF.
The reservoir fluid is pumped out by the pump, through the damping chamber, to the
master cvlinder.
MODUIATON
19-42