Funky Buddha

Can you cross drill stock rotors?

NoahsMP5

sparkoonline sells cross driled mazda oem rotors so i would think so.

carguycw

I wouldn't try it if I were you. If you screw it up, the rotors may crack and fail during heavy braking. If a rotor breaks, you run the risk of a serious wreck.

BTW you should be aware that cross-drilled rotors are essentially a cosmetic mod that won't do much of anything for performance. Kindly do a search for my past posts if you want to learn more.

Funky Buddha

Well yeah, I kinda thought it was more for cosmetic which I was wondering if you could cross drill them. So why don't cross drilled rotors break then? You see a lot of modded cars as well as race cars use cross drilled rotors or slotted rotors. Are they just thicker then? Also, if you look at disc brakes for motorbikes..most of them are cross drilled as well. I don't think it's purely for cosmetic reasons since it helps dissipate heat and prevents rotor warp and decreases pad wear as well.

Davard

First, cross drilled rotors that you buy usually have gone to the trouble of figuring out where they can drill holes without damaging the disc. Also, the discs are new and haven't been heat-cycled, which means they are less brittle.

Any time you drill a rotor, you create the potential for a stress riser...where a crack can start. When you start with a new disc, the likelyhood of a crack forming are lower, plus most of them have liability to worry about. If you have a crash as a result of the disc breaking, you could sue them. So they make sure it won't fail.