Chrysler Conquest 1988 Service Manual page 165

BRAKES - General Information
5-l
1
2. Slow restoration of the brake fluid pressure for the rear
brakes to a normal level
Once the brake fluid pressure to the rear brakes has been
reduced, the brake fluid pressure reduction signal will cease
to be output, the release solenoid valve will return to its
non-operating condition, and the air intake to chamber B will
be stopped. Because the atmospheric pressure of chamber
B passes through the orifice, the pressure in chamber B will
gradually change from atmospheric pressure to a vacuum,
and, as a result, the pressure difference between chamber
A and chamber B will gradually disappear. The brake fluid
plunger will be pressed back to the right by the force of the
main spring, the condition will be the same as when not
operating, and the normal level of brake fluid pressure will
be supplied to the rear brakes.
3. Quick restoration of the brake fluid pressure for the rear
brakes to normal level
The electric current will flow to the build-up solenoid valve,
the build-up plunger will move to the right, and the build-up
valve seat will open. Because the pressure reduction of
chamber B is done through both the orifice and the build-up
valve seat, the pressure of chamber A and chamber B will
quickly equalize.
NOTE
If the brake fluid pressure is reduced too much and the level
of wheel speed reduction becomes significantly lower than
the desired level, the build-up solenoid valve will operate to
rapidly achieve the desired level of speed reduction.
Chamber B (vacuum)
Chamber A (vacuum)
\
Main T:'g
\ lar::refilease valve seat B Release valve seat A
\ \
'
Release
solenoid
valve
j j,i i Chamber B
(vacuum)
rake fluid pressure
control section
rake fluid pressure plunge
_-____
To vacuum source
Vacuum drive section
\
Vacuum piston
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