Honda ACCORD HYBRID 2005 Service Manual page 1389

Modulator Unit
The modulator unit consists of the inlet solenoid valve, outlet solenoid valve, TCS normally open (NO) solenoid valve,
TCS normally closed (NC) solenoid valve, reservoir, p u m p , p u m p motor, and the d a m p i n g chamber.
The modulator controls the caliper f l u i d pressure directly. It is a circulating-type modulator because the brake fluid
circulates t h r o u g h the caliper, the 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 w h e e l .
ABS Control
Pressure intensifying mode
TCS NO valve open, TCS NC valve closed, inlet valve open, outlet valve closed.
Master cylinder fluid is p u m p e d out to the caliper.
Pump motor
W h e n starting the pressure reducing m o d e , the p u m p m o t o r is ON. W h e n stopping ABS operation, the p u m p m o t o r is
OFF.
The reservoir f l u i d is p u m p e d out by the p u m p , t h r o u g h the d a m p i n g chamber, to the master cylinder.
MASTER CYLINDER
RL
FR
FL RR
Pressure retaining mode
TCS NO valve o p e n , TCS NC valve closed, inlet valve closed, outlet valve closed.
Caliper fluid is retained by the inlet valve and outlet valve.
MASTER CYLINDER
RL FR FL RR
(cont/d)
19-45