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Checking the bypass valve

Checking the bypass valve

Checks


1. Detach the vacuum hose from the bypass valve.


2. Connect the pressure/vacuum pump, part no. 30 14 883, and create a vacuum pressure in the valve.


3. Check that the diaphragm is intact. If the diaphragm is damaged, the vacuum is released.

4. Pump up an overpressure in the valve.

5. Check that the diaphragm is intact. If the diaphragm is damaged, the overpressure is released.

6. Detach the pump.

7. Connect the vacuum hose.