i have an american standard faucet set in my bathroom on my second floor (only) bathroom, and when you try to fill the tub or turn the shower on to a warm position on the diverter, the cold water line (from the bathroom all the way down to the street source)shakes pretty hard for as long as the water is kept at that temp. position. if you change it to hotter or colder, it will go away, but somewhere in the middle, it shake the pipes.
any suggestions?
thank you!