Why does my nearside front make a dry mettalic knocking noise? When it does knock.. it does so rapidly with the rise and fall of the wheel. It's usually when i go down hill over potholes or uneven ground. I think it's louder after a few days without rain. I've greased what i can see but no joy. I had anti roll bar bushes, upper and lower suspension ball joints and steering idler replaced with no joy. Running out of money!!! Can any kind soul point me in the right direction please?