Faster cooling isn't always good, especially when it comes to brake disks. Anyone up for cracked rotors?

 

Cross-drilled rotors tend to crack but they are the best for cooling purposes. The cooler the brake rotor, the less brake fade that occurs. The larger the surface area does not equal cooler rotors, it just means that there will be less brake fade. If you have a slower rate of brake fade then you will shorten your braking distance. Slotted rotors don't disperse heat as well as cross-drilled, but they are stronger and are better than stock.

I have the EBC's with "dimples"



Dimples aren't as effective as cross-drilled but they are more effective than just slotted alone. Many people like to go for the slotted-cross-drilled rotors, but they give the the good performance of both but they are still prone to cracking like regular cross-drilled.

 

Slotted rotors are not to expel hot gases. They shave off a bit of brake pad giving you a fresh surface to brake on everytime you brake.

Cross drilled expel hot gases back in the day when brake pads gassed alot. Nowadays brake pads do not do that.

 

dimpled allows for collection of particles that would otherwise cost your brakes to fade. pieces of brake shoe, dust, road dirt, etc get collected by the dimples. also, rounded pores instead of flat surface will cool better.

my OEM rotors were slotted, my brembos are slotted/dimpled, (proly the same guy). they work much better, and i have less worries of cracking. the severe heating/cooling caused by slotted & drilled may be part of the reason that under intense braking they crack.

 

I had slotted, had cross drilled, and now have Brembo blanks and my stopping power is so much better.

 

I'll take it from mikey! You just answered my question.

 

Why use drilled or slotted discs?
Drilling or slotting discs aids the disc in several ways:
The edges of the slots or holes continuously clean and refresh the pad surface as well as providing increased brake "bite". Additionally, they prevent gasses from collecting between the pad and disc interface.
The disc is lightened, thereby decreasing its rotational inertia.
Improved ventilation increases the disc's ability to shed heat, resulting in cooler operating temperatures


IMO I used OEM and brembo rotors (which i currently use)
the brembo have lasted much longer than the OEM rotor (which i replaced because they warped at 12,000 miles) so far i have put 28,000 miles on my brembos and they barely have any warping.

people say dimple drilling is better because it "does the same thing as drilling but does not affect the integrity of the rotor." As the pads closes on rotor, a drilled hole would let the rotor and pad contact as better opposed to a dimple drilled rotor.. my reasoning? as the pad closes in on the dimple, it can create an air pocket in that area, which could be slightly pressurized, going against the force of the pad. Also holes are meant to "shave" a layer of the pad giving some fresher unglazed surfaces of the pad to brake with. The residue would flow out of the hole in a drilld rootr.. what about dimple drilled?

as far as drilled rotors cracking, I never "broke in" my brembo rotors, even by stupidity ran my pads down to the metal and braked with them, and they have not cracked nor has the surface been fuct up

 

I don't think you need to worry too much about them cracking or shattering unless you brake hard for a long period of time. Even if you autocross, your only hard on them for 1-2 mins at a time.

 

Nowadays you do not need crossed drilled rotors. Slotted rotors I still question.

Pads don't gas like they used to years ago. Yes some companies like Porsche still use them.

But the less brake rotor you have (due to cross drilling) the less surface (or cooling area) you have to keep your rotors cool. This contributes to less brake fad. Ask anyone on the Honda Challenge team what they use.

Remember brakes need surface area to stop better, which is why people upgrade to bigger brakes. More surface area equals more cooling area to keep the brakes cooler which equals more stopping power.

I used cross drilled rotors and AEM pads at VIR in February (50-60 degrees out) and I still faded my brakes on the first day. now granted I was using stock OEM honda brake fluid, which boiled too.

 

i was told youre supposed to use honda OEM by the ass jockey at trash auto. is that incorrect? what do you use now?