Daihatsu F300 Service Manual page 536

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In case where no negative pressure Is available:

In instances where no negative pressure is applied to the

booster owing to some troubles, both the constant pressure

chamber and variable pressure chamber remain under the

atmospheric pressure condition, thereby offering no power as-

sist. Nevertheless, when the brake pedal is depressed and the

operating rod travels toward the left side, a force is applied to

the piston rod from the air valve through the reaction disc.

At this time, the air valve also pushes the valve stopper key,

which is inserted into the booster piston, to the left. Then, the

force overcomes the tension of the piston return spring and

moves the booster piston to the left. As a result, a hydraulic

pressure is generated in the master cylinder. In this way, the

braking performance of the vehicle is assured at all times.

Constant pressure chamber

{Atmosphere)

Booster piston

Reaction disc

Operating rod

Valve stopper key

Variable pressure chamber

(Atmosphere)

WFE90-IlR014

The vacuum hose provided between the engine suction system and the brake booster incorporates a check

The vacuum hose bears a letter "ENGINE

The arrowheaded direction must face toward the engine side .

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