the other day i noticed a slight knocking noise as i went over bumps i could ony hear it with the stereo and heater turned off and the window down. ive had a similar noise in the past (but louder) and it turned out to be either a suspension top mount (which i dont think it will be cause mine where replaced when i did my suspension) or a ball joint but i have investigated and cant see a split in the ball joint. but i have noticed a split in the rear wishbone bush. stupid question time would this split in the bush cause the slight knocking noise??