Hudson 1955 Rambler, Technical & Service Manual

Page: 187 / 292

FIGURE 14— Applied Position
the push rod and plunger during initial applica-
tion of the power unit by use of the inner
"first stage" diaphragm. After initial applica-
tion, the force of the counter-reaction spring
is overcome and additional reaction force is
obtained.
Holding Position
When the operator holds a steady pressure on the
brake pedal during any phase of a braking opera-
tion, the reactionary force created within the
power piston bal ances the physical pedal
pressure and allows the power piston and
rod plunger to reach a holding position.
When this occurs, both the vacuum and
atmosphere poppets are seated and the
degree of vacuum at the right side of the
piston and at the left side of the
diaphragm assembly is sufficient to give
the required degree of hydraulic pressure
and corresponding reaction force until
such a time when a further application or
release takes place (Fig. 15).
BRAKES, AND WHEELS-HUBS AND DRUMS 9
FIGURE 15— Holding Position