Checking tire valves (Opel Vectra A)

Unscrew the cap from the valve.

Apply some soapy foam to the valve. If air bubbles form, tighten the valve with the back of the cap.

Attention! Use only the metal cap to tighten the valve.

Check the valve again. If air bubbles form again and the valve cannot be tightened, replace it.

Screw on the cap.