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 slightly downwards. If this is not the case, check the vacuum hose and connectors for leaks.
2. If you are unable to find the leak, then you should suspect an internal fault in the servo unit. Then you should disassemble the servo unit and replace it if it is faulty.
[Material copied from this resource: Opelbook.ru]
Vacuum servo unit (booster) — checking the operation (Opel Ascona C)
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