Slotted Rotors?

[dwreck30]

I need to get my brakes done and I,ve been looking for quite a while and cant find any slotted rotors. I want to keep the stock size and don't want drilled and slotted. Anyone know where I can get a set for the front and maybe the back? Thanks

[BAC5.2]

Is there a particular reason you want sloted rotors?

If it's for the look, I'm sure EBC or someone makes a pair of slotted rotors.

But to tell the truth, the stock brakes aren't effective enough to notice the difference between slotted rotors and solid rotors. Slotted rotors won't do a whole lot more than eat pads.


That said, if you look, you can get a complete front WRX setup (including stock pads and rotors) for about the same price as stock replacement rotors from Brembo (solid, available at www.buybrakes.com or Tirerack).

Or you could just run a slightly more aggressive street pad (some say the Axis Metal Masters or Ultimates are nice) on a solid, cryo-treated rotor, and you'll be A-OK.

[Legacy777]

I've got slotted rotors......there's really not too much need for them. Primitive racing sells them.

I will be getting a new set of rotors for the rear, and will most likely not be getting slotted rotors again.

[scottzg]

But to tell the truth, the stock brakes aren't effective enough to notice the difference between slotted rotors and solid rotors.

Mind explaining this a little more? Why aren't stock brakes effective? Are you assuming stock pads?

[BAC5.2]

Speaking strictly in size, our front brakes wouldn't benefit much from a slotted rotor. The added heat dissipation that a slotted rotor provides, isn't going to increase dissipation very much over a solid rotor. You are giving up brake surface area for a moderate increase in cooling. Plus, some not-so-great slotted rotors have a tendancy to chew up pads.

If you are driving to a point where you require additional cooling help on the front brakes, you seriously need to reconsider your driving styles or your brake upgrade path.

[vrg3]

I thought the point of slotting a rotor was to help keep the pad surface clean and to increase abrasive friction, not to aid in cooling.

[scottzg]

What difference does contact area matter? The pad material is still there, and the rotor is the same size. Seems like it should dissipate heat just as well. The 5% difference in pad surface area should just equate to a tiny bit more pedal pressure required.

Anyway, im pretty sure that the slots are there to increase abrasive friction and clean the pad.

[scottzg]

Ahh, vrg beat me to half my post. See what happens when you dont submit fast enough?

[BAC5.2]

Doh, I was confusing cross-drilled rotors and slotted rotors.

However, re-reading the "Brake" post by Josh in The Library, it appears that the cleaning of the brake pad is trivial, and that they increase heat in the system (which can be good, but if you are running OEM pads, I'd imagine that you'd exceed their heat range a bit faster, overall hurting performance).

The slots are apparently there to vent gasses from being built up, but I would imagine them to help cooling a bit too (the divots increase surface area of the rotor. There is a loss in contact area though). Perhaps not a significant amount (and the fact that slotted rotors supposedly help increase the brake system temperatures might counter this).

[Legacy777]

I do need to update that brake article....but essentially slotted rotors aid in initial bite, help with any sort of pad gassing that may occur (albeit, very minimal with today's pads), and do help slightly to prevent glazing.

that's it...