PJ1976

Hi. Iv got a mk4 golf v6 4motion which iv owned for past 2 years. Recently i took a right hand corner at about 55 to 60mph. Half way round corner somthing seemed to go on the rear, causing it to step out. Since then the rear end of my golf seems to be very loose/light and the handaling is not good. Any idea whats gone wrong with it ?.