All my 240s have done site, all 5 of them now <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt='
'>
It happens to me when im in reverse and you hit the brake it sounds like a loud ding or pop almost. Not sure what causes it but it isnt really a problem. Seems to happen to me more when my rear brakes need changing.