1. To check whether the servomotor is working or not, proceed as follows.
2. After stopping the engine, depress the brake pedal several times to dissipate the vacuum from the servomotor unit.
3. With the brake pedal depressed, start the engine. The pedal should move slightly towards the floor with the additional help of the servomotor unit. If not, check the vacuum hose and check valve. If they work, then the amplifier itself is defective and should be replaced.
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