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Brake servo (brake servo)
Brake servo operates using the vacuum created only during engine operation. So never practice the movement of the vehicle coasting with the engine off.
If the brake servo does not operate, for example, when towing a vehicle or failure of the amplifier, it needs to be significantly harder to press the brake pedal to compensate for the absence of additional force to the brake actuator, generated during normal operation of the amplifier.
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