Withdrawal
Disconnect the valve connector by first lifting the safety bracket.
Unscrew the valve from the bracket.
Disconnect the ventilation hoses and pull out the valve.
Examination
Connect to outlet (diameter 8 mm) valve vacuum hose with vacuum pump.
Apply a voltage of 12 volts to the valve with auxiliary wires, plus (+) to red-white contact and minus (-) to the brown contact.
Create a vacuum of 600 + 100 mbar with a vacuum pump.
Within approx. 20 seconds, the pressure drop must not exceed 50 mbar. Otherwise, replace the ventilation valve.
Installation
Connect hoses. Check the reliability and tightness of the connections.
Screw on the valve.
Connect the connector and secure with the bracket.