1. Press the brake pedal several times and then keep it pressed with the engine off. Start the engine; at the same time, you should feel that the pedal moves down slightly. If not, check the vacuum hose and connectors for leaks.
2. If you are unable to find a leak, then you should suspect an internal malfunction in the servo assembly. Then you should disassemble the servo assembly and replace it in case of malfunction.
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