POWER BOOSTER 4C – 7
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
POWER BOOSTER
The power booster is a single diaphragm, vacuum oper-
ated unit. When the brakes are not applied, there is no
power assist because equal pressure (vacuum) exists on
both sides of the power booster diaphragm. When the
brakes are applied, vacuum is present on one side of the
diaphragm, and air, at atmospheric pressure, is admitted
to the other side. Power assist is provided when there is
unequal pressure on opposite sides of the diaphragm.
When the brakes are released, atmospheric pressure is
shut off, and the vacuum source creates equal pressure
on both sides of the diaphragm by means of a one–way
valve in the power booster.
Important : If any hydraulic component is removed or dis-
connected, it may be necessary to bleed all or part of the
brake system.
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