You will need a vacuum gauge to check.
Examination
The check is made using a vacuum gauge.
1. Disconnect the vacuum tube from the pump and connect a vacuum gauge using a suitable piece of hose.
2. Start the engine and let it idle, measure the depth of vacuum created by the pump - after about one minute, the device should register a reading of about 500 mm Hg. Art. A significantly lower result indicates a pump failure - consult a car service specialist.
A faulty pump cannot be repaired and is replaced as an assembly.
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