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FIGURE 13—
Released Position
Atmosphere after passing through the air
cleaner enters the power cylinder. It then
passes through the open atmospheric poppet to
the left side of diaphragm assembly and through
a passage in the front piston plate to the
right side of the power piston.
Atmosphere also passes through a by-pass
hole in the piston to the right side of the
diaphragm assembly. A small hole in the
diaphragm plate allows atmosphere to enter the
first or inner stage of the diaphragm assembly.
A small passage in the piston at the vacuum
poppet admits atmosphere to the left side of
the vacuum poppet compensator diaphragm. With
vacuum on the right side of the compensator
stem diaphragm, a slight force is exerted on
the vacuum poppet, partially balancing the
force of differential pressure against the
vacuum poppet. Both the power piston and the
diaphragm assembly are now balanced in atmo-
spheric pressure. The piston is held to the
left in its released position by the piston
return spring and the push rod and plunger
assembly is held in position in the piston by
the push rod return spring.
The piston return spring is attached to the
master cylinder piston rod. It, therefore,
holds the piston rod in the released position
and the compensating port of the master
cylinder open.
Applied Position
As the brake pedal is depressed, the push rod
and plunger move to the right in the power
piston allowing the pivot arm and atmosphere
poppet spring to close the atmosphere poppet.
After the atmosphere poppet closes, the pivot
arm, which pivots freely on the push rod
plunger, opens the vacuum poppet (Fig. 14).
The balancing force against the vacuum
poppet, by the vacuum poppet compensator stem,
reduces the force required to lift the poppet
from its seat. Smoothness in the initial
application of the power brake is thereby
obtained.
With the vacuum poppet open, vacuum is
transmitted to the left side of the diaphragm
assembly and to the right side of the power
piston. With vacuum on the right side of the
piston and atmospheric pressure on the left
side, a pressure differential is created which
moves the piston to the right compressing the
return spring.
As the power piston moves to the right, the
hydraulic plunger moves to the right in the
hydraulic cylinder. Initial movement of the
plunger allows the compensating valve to seat,
trapping fluid in the hydraulic cylinder.
Fluid under pressure then passes through the
residual check valve and through the lines to
the wheel cylinders.
With vacuum on the left side of the
diaphragm assembly and atmospheric pressure on
the right side, a reaction force is obtained.
The reaction force is proportioned to the
applying force acting on the power piston, thus
giving the driver a complete feel of his
brakes. A lighter degree of reaction is
obtained against
8
TECHNICAL SERVICE MANUAL
Содержание 1955 Rambler
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