Brake Booster - SSANGYONG Rexton Y200 Manual

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BRAKE BOOSTER

The brake booster is a double-diaphragm, vacuum-

suspended unit. In normal operating mode, with the

service brakes in the release position, a vacuum-

suspended booster operates with a vacuum on both

sides of its diaphragm. When the brakes are applied,

air at atmospheric pressure is admitted to one side of

the diaphragm to provide the power assist. When the

brakes are released, atmospheric air is shut off from

that side of the diaphragm. The air is then drawn from

the booster through the vacuum check valve by the

vacuum source.

1. Pressure Distribution At working

When it pushes the brake pedal, the booster pushrod

(1) pushes the poppet (2) and valve plunger (3) and

the poppet (2) goes closely to the power piston (5)

resulting in closing the vacuum valve (9). The power

cylinder (A) and (B) is isolated and the valve plunger

(3) is separated from the poppet (2). And then the air

valve (6) opens in order to flow air into (B) through the

filter and thus, the power piston (5) enables to push

the master cylinder pushrod (7) for pressure

distribution.

SSANGYONG Y200

2. Pressure Distribution After working

When it pushes off the brake pedal, the valve plunger

(3) returns back to the original position by return spring

(4) resulted in closing the air valve (6) and open the

vacuum valve (9) in order to balance the pressures

between (A) and (B) of the power cylinder. And then

the power piston (5) returns back to the original position

by the master cylinder reaction and the diaphragm

return spring (8) pressure.

BRAKE SYSTEM 4A-3

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