Stupid Question about rotors!

Ok, I know that when you change your rotors you have to clean them with break cleaner. Here is the stupid question, why? What is the signifigance of doing this? Is it determental if it is not done?

TIA

Not a stupid question.

Any contamination(sp) will not allow the brakes to perform to 100%, in a nutshell. Is it detramental, not really. Would I clean the brakes before using them, probably give a shot of cleaner.

The biggest issue with new rotors is proper bedding.

Ok, I know that when you change your rotors you have to clean them with break cleaner. Here is the stupid question, why? What is the signifigance of doing this? Is it determental if it is not done?

TIA


Durring the creation of the rotor, there is alot of machining done, with oil used to cool it. So the oil residue may still be on the rotors.

i work at an auto parts store and yes it is very important to clean the rotors very good the do have oil on them to keep them from rusting while they are sitting on the shelf at the manufactures warehouse wating for a parts supplier to buy yhem then again at the supplyers warehouse waitng on delivery to the parts store then again there waitng for you to buy them. also be sure to clean the aera that the bearing go into as well just to make sure that there isn't any small metal patricles in there.