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Checking the bypass valve (B235R, B205L/R)

Checking the bypass valve (B235R, B205L/R)


1. Disconnect the vacuum hose from the bypass valve.


2. Connect 30 14 883 Pressure/vacuum pump and create a negative pressure in the valve.

3. Make sure the diaphragm is undamaged. If it is, it will not hold the vacuum.

4. Repeat steps 2 and 3, this time creating positive pressure.


5. Disconnect the pump.

6. Connect the vacuum hose.