Abs Modulator - Honda S2000 Service Manual

ABS Components
System Description (cont'd)
ABS Modulator
The ABS modulator consists of the inlet solenoid valve, outlet solenoid valve, reservoir, pump, pump motor, and the
damping chamber. The modulator reduces the caliper fluid pressu re directly. lt is a circulating-type modulator
b e c a u s e t h e b r a k e f l u i d c i r c u l a t e s t h r o u g h t h e c a l i p e r , r e s e r v o i r , a n d t h e m a s t e r c y l i n d e r , T h e h y d r a u l i c c o n t r o l
h a s
three modes: pressure intensifying, pressure retaining, and pressure reducing. The hydraulic circuit is an independent
four channel tvpe, one channel for each wheel.
M A S T E E C Y L I N O E R
MODULATOR
_.1
FH
HL
RR FL
H,,, li"'J.l1,Tiil^illt'iL.::...!..,,
Pressure intensifying mode: In let va lve open, outlet valve closed
M a s t e r c y l i n d e r f l u i d i s p u m p e d o u t t o t h e c a l i p e r .
Pressure retaining mode: Inlet valve closed, outlet valve closed
C a l i p e r f l u i d i s r e t a i n e d b y t h e i n l e t v a l v e a n d o u t l e t v a l v e .
Pressure reducing mode:
Inlet valve closed, outlet valve open
Caliper fluid flows through the outlet valve to the reservoir.
Motor operation mode:
When staning the pressure reducing mode, the pump motor is ON.
When stopping ABS operation, the pump motor is OFF.
T h e r e s e r v o i r f l u i d i s p u m p e d o u t b y t h e p u m p , t h r o u g h t h e d a m p i n g c h a m b e r , t o t h e
m a s t e r c y l i n d e r .
19-44