If you have a tire pressure gauge, remove the wheel valve cap and check the tire pressure. If the pressure is below normal, you should drive at low speed to the nearest service station and restore the pressure to normal. If the tire pressure is higher than normal, reduce it to the required value. After checking and setting the tire pressure, be sure to tighten the valve cap. A valve without a cap may leak air. If the cap is lost, purchase a new one as soon as possible and screw it back on. After changing a wheel, stow the flat tire in the luggage compartment and replace the tool and jack.