I have three full and one half bathrooms in my home. In the master bath when you flush the toilet0 , I get a banging noise and when you run the hot water in the sink, tub or shower the noise starts but does not happen when you run just the cold water in the tub, shower and sink. I tried shutting the water off in my home and let the pipes drain but that did not solve the problem. This is a condo with 4 units but only the second and third floor have the noise. WE also shut off the water to the building and drained the bathroom where the problem is on the 2nd and third floor with no results.

It appears to me you have loose part inside your angle stop or shower valve. First, do this: Close - and Open angle stop (valve) under the toilet. . You close and open the valve to change position of the stem as well as to dislodge any debris attached to it. Both can be reason for the noise. Do the same for sink ( valves should be under the sink, inside your cabinet ) . See if the noise continues. Back to you. Milo