After toilet is done filling up after being flushed, a LOUD noise is heard in the pipes for a couple seconds. The pipes vibrate, then noise fades away. This only happens when this toilet is flushed, not when any other appliance in the house is used.
I have this problem as well, but it happens on all 3 toilets in my house…I have tried to shut off one at a time and i still hear the noise when i flush the other ones. All 3 can’t be bad, could they? House is just 2 years old and only had people living in it since this past december…