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Brake servo - general data and check
1. The vacuum amplifier is designed to increase the efforts on the pistons of the master cylinder by the vacuum created in the intake manifold of the engine. 2. In the operation of care unit is not required. Power changes only after a very high mileage vehicle. There is a need to replace ascending pedal force necessary for braking. 3. To check the operation of the amplifier repeatedly press the brake pedal. Pedal stroke each time should not be changed. 4. Hold down the pedal, start the engine, leave much to be -pedal forward. 5. Hold the pedal depressed, stop the engine, -to within 30 seconds after stopping the pedal position should not be changed. 6. Start the engine again, after 1-2 minutes, stop. With the power, press the pedal a few times - the pedal course should decrease gradually. 7. If the pedal is different from the one described above, follow these steps. 1). Check the condition of hoses before and after the control valve, replace damaged hoses. 2). Check the condition of the control valve. To do this, remove the mouth of the air hose. If there is air leak, replace the valve. In the presence of the pump, create a valve amplifier by the pressure of about 200 torr. The pressure drop should not exceed 6 torr for 15 seconds. 3). In the opposite direction the valve must allow air. Otherwise, replace the valve. 4). Check amplifier. To do this, turn on the vacuum gauge between the valve and the amplifier and start the engine, gradually increasing the pace, bring to 500 torr vacuum and stop the engine. The pressure drop should not exceed 25 torr for 15 seconds. Otherwise, replace the amplifier. 5). Perform these checks when fully depressed the brake pedal. If leakage exceeds the specified norm, replace the amplifier.
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