hi i am new on as not long had my seat long. but i seems to have developed a very anoying knock and hissing noise from the front nearside when i go over any bumps or anything like that . i suspect the shocker absorber has gone because i have heard these are common for going and seen as i have had to change one on a 4 year old polo. just wondering if anyone has had this before ? just to mention i have replaced the antiroll bar like and bottom ball joint on the same side.