Check Valve
WARNING: This page is about a different car, the 1994 Mazda 929. However, it is still accessible from the selected car via links, so may be relevant.
Remove check valve. Blow air through port "A", and verify flow through port "B". Ensure air does not flow in reverse direction. Replace as necessary.
Remove check valve. Blow air through port "A" and verify flow through port "B". Ensure air does not flow in reverse direction. Replace as necessary.