Subaru SVX 1992 Manual page 838

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5. BRAKE BOOSTER RELEASED

6. BRAKE BOOSTER WITH NO VACUUM

When the force of brake pedal depression decreases, , When the brake pedal is depressed while the constant-

the forces acting on the reaction disc and plunger valve

and variable-pressure chambers are held at atmos-

are unbalanced, so that the plunger valve is moved to

pheric pressure, the operating rod moves to the left .

This moves the plunger valve which in turn pushes the

The plunger valve then comes in contact with the

hub via the key.

atmospheric valve of the poppet valve to shut off the

The reaction disc (which is built into the hub) then

passage between the variable-pressure chamber and

moves the master cylinder piston via the push rod . At

this point a boosting force does not occur, but oil

atmospheric air and, at the same time, moves the

pressure is produced by movement of the master cyl-

poppet valve back. Movement of the poppet valve

inder piston . As a result, the system serves as a hydrau-

opens the vacuum valve so that passages A and B are

linked with each other.

Air from the variable-pressure chamber is then deliv-

ered to the constant-pressure chamber . This eliminates

any pressure differential between the two chambers . As

a result, the diaphragm plate is pushed back to the

Variable-pressure chamber

"release" position by the return spring .

` Reaction disc

Variable-pressure chamber

Plunger valve

Poppet valve

Diaphragm plate

Constant-pressure chamber

Return spring

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