I just got an sl320 1999 and i dont have the owner manual. i got an error on the front panel. it is something like that ((O)) , what is this?

That looks like a warning that you need to replace the brake pads. Also, you might want to purchase a replacement owners' manual from MBUSA. If you do a search on this site we have the phone number and website info posted.

That is a damn good drawing you did! You need brakes.