Can rotors that are cross drilled, slotted, or dimpled be machined just like stock if they warp or wear too much?

 

when you cut away at something you take away from the original integrity of the product. although there are safety limits with stock rotors and they can be cut within guidelines. with slotted, etc., you will be cutting away the slots., etc., which will take away some of the original performance of the rotors. i will replace mine when they go bad. they should be installed with new pads that are designed for the rotor. also the brake lines should be bleed professionaly. so that your brakes will operate to begin with properly. then there is a breakin period for new rotors.before harsh braking.

 

So are you telling me that it can be done, but it's not recomended?

 

Dont get your brakes blead. one of the cheapest, easiest to install, and satisfying mods is to install speed bleeders on you calipers. Very simple, take old bleed screw out, screw in new one. The speed bleeders are basically a one way valve so they cant pull air back in and you can bleed them by your self. Cost about 15 a pair.

 

yes they could be cut once if they are crossed drilled, if the rotor gets to thin you will start getting cracks between the crossed drill holes. lets not forget most of all the crossed drilled rotos are stock rotor and somebody drills them.

 

Yup.. many shops won't even do it because they have problems with them..

I have no experience with slotted ones, but with drilled rotors (slotted will behave the same in the machine).. the cutting/grinding surface of the machine will pass over the holes/slots in the rotor and think "woah!! no metal to cut!".. then right about tha ttime, it runs into the other side of the hole/slot and goes crazy..

what will end up happening is that they'll crack the rotor or ruin the cuttign bits on their machine..
of course, there are other times where everything works beautifully and your rotors are back in good shape.

 

and as long as they don't try to level out the rotor in one or two runs it shouldn't hurt the bit. I do them very graduall cuz thos bits are not cheap. I don't know about sloted but it should work as long as they do it slow.

And yea the more you cut the weaker they get especially when they have holes in them. If you hear about new cross drill rotors cracking imagine making them thinner.
I would say maybe getting them turned once might not be too bad but it also depends how bad they're warped and how muched has to be shaved.