New brakes

Ok i got my new rotors installed the other day and they greatly improved my stopping ability But now when ever my car is in nuetral it makes a funny knocking sound comming from the front right side. Also today my abs light in the dash came on for a litlle bit but when i turned the car off and back on it went off.. I was wondering if these two have something to do with the knock sound. And if not what could be causing the sound?

If you had a shop do it I would take it back. It is most likely something left loose or improperly installed. If it was their fault I wouldn't mess with it. It's their responsibility.

My friend did it he has all air rachets and shit like that