hi, just got a preown 4 series about a week ago. however since yesterday i can hear a 'tiak tiak' sound like water dripping etc from somewhere from the rear wheels/back of the car area after i park/ stop the engine. check no water drip out. it would go on for about 5-10 mins before the sound goes away. Any ones have similair issue before and what would be the cause of it? thanks a lot.
