When drying my wheel today after a wash, I realize there is a chip on the front brake rotor edge. After inspected closely I think it was machined like that for balancing. Does anyone else have the same thing happened on their rotors?

 

How do you manage that? Looks like a manufacturing defect.

I dont think it would make much difference. As you say could be for balance.

 

I will probably ask when next time I bring in for service. It happen on the other side (passenger) too. But not the rear

 

Whoa, that is trippy. Definitely looks intentional (i.e., machined as you said).

 

Could a stone do that?

 

no, it's not cause from a stone or anything damaged. the edge is so smooth with the black color coated

 

That is not a chip. That is a machined process. I am almost certain that is for balancing. Unlike balancing wheels, where weight is added, the balancing of rotors (and many other machined or plastic-molded parts) uses the term "negative balancing" where, during the balancing process, weight is taken off the rotor.

 

That's what I thought too, but usually its just a notch on the side of the rotor that shouldn't be able to see from the front of the wheel

 

Same thing on both sides should put you at ease, also the fact that the cut surface looks smooth suggests that this was done on purpose (Hanz at the factory is trying to assassinate you)