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Page Title: Figure 9-6. Vacuum Power Unit Exploded View.
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TM 10-3930-633-34
The center plate,  located between the two
poppet is of the flexible rubber type and is
diaphragms, divides the power unit into four
supported by the valve body hub of the rear
chambers. A long, threaded hub on the front plate
diaphragm plate.
(2) In the released position, the poppet return
slides through the center hole in the center plate
spring holds the poppet against the atmospheric
and is screwed into the hub of the rear plate to
maintain a set separation between the two
port seat (valve plunger). A special type of seal is
diaphragms as the front and rear plates and
used to seal the opening between the valve body
diaphragms move backward and forward. This
sleeve and the rear shell.
(3) Vacuum is supplied to the power brake
front plate hub is sealed by a vacuum seal that is
permanently installed in the stationary center
unit through a vacuum check valve mounted in
plate. Two drilled air passages intersect in the
the front shell. Air for operation is admitted
through silencer-filters within the valve housing.
mounting flange of the master cylinder to provide
At its front end, the power section incorporates
"free breathing" for this cavity during braking.
another special seal to close the opening between
9-9. Vacuum Power Unit Repair
the front shell and hydraulic pushrod.
a. Disassembly. Refer to figure 9-6 for parts
(4) The hydraulic pushrod is the link between
identification and proceed as follows:
the vacuum power diaphragm and plate assembly
and the hydraulic pistons in the master cylinder.
Figure 9-6. Vacuum Power Unit Exploded View.
(1) Scribe across the flanges of both shells
nuts and lockwashers and set master cylinder
and the master cylinder to provide a guide mark
aside.
for assembly. Remove master cylinder attaching

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