All brake rotors are not created equal. Just as with brake pads, brake rotors come in many different quality levels. The main differences between rotors are weight and interior design. The original engine manufacturer will design a certain weight brake rotor so it has enough metal mass to absorb and dissipate heat properly for the weight of the vehicle and possible tow capacity as well. Aftermarket manufacturers will often make a lighter rotor to save money. This is most often seen on the internet with a fantastic price compared to original brake rotors. The brake rotor is also made by joining two pieces of metal together. The area they are joined with can be different shapes. If the shape is a more intricate design there will be more metal inside the rotor to give it strength as well as dissipate heat better. This will help prevent rotor warping and soft brake pedal from brake fade due to heat. Here at Drake Auto located in Sterling, VA we use only brake rotors that meet or exceed original manufacturers specifications.