I am replacing my front and rear disc brake pads on my 2004 S. Some mechanics are telling me I need to replace the rotors also. Yes or No.

 

You have to measure them and compare to specs ... At bare minimum they need be turned and checked for true ... if they are below spec after turning they need replaced

 

You need to be wise. Some of the mechanics telling that 'yeah you need to change bla bla bla' just for you to buy a new one to their shop. You need someone knows about that. or knows about car accessories. if you have.