Brakes: Cross Drilled or Slotted

[1qwik4]

I am looking into brake replacements and was wondering which is better?? I read that cross drilled brakes crack and I heard slotted brakes wear pads quickly. So, any ideas on which is better? I was looking into power slots personally.. Also brake pads, any rec's here, there is axxis, pbr, hawk, etc?? Names of good manufacturer's help.. I am looking into OE replacements not big brakes. Thanks in advance.

[Afrokid]

having them both are best, but i believe i read that cross drilled allowed air for better cooling or something like that.

[intelligence27]

BOTH!!! go with cross drilled and slotted rotors and some green stuff or red stuff break pads if ur really serious. thats my insight

[89Turbo944]

The purpose of having the holes, or dimples in a rotar are to allow the gas that is created from the brake pad contact witht he disc to go somewhere. So it goes in these holes or dimples.

Ceoss drilling can be advantagious only if you increase the general area that the rotar surface covers. In other words, you need a biger rotor. Otherwise you are infact decreasing your braking force because the holes or dimples take away from the surface area. But at the same tie they provide a place for the gas to go as well as adding in cooling.

Cross drilled rotors generaly crack because they heat up fast and cool down to fast, like doing some hard braking in the cold weather and the rotor heats up and then you park it and it cools quickly, this will cause cracking.

The sloted or groved rotors esentialy do the same thing as holes or dimples except that they evacuate the gas as soon as it is created. They are also less prone to cracking. Both will wear pads quicker because they have hsarp edjec that the pad will grab.

If you intend on doing mostly spirited road driving and maby the occasional race day i would sugest that you go with just slotted. If you do track days on many occasions then go with cross drilled.

DO NOT G?ET BOTH, unless you just want the look. This will decrease your braking distance grately. There is even less surface area for the pad to bite. These were designed for the look not really function.

One last thinng, not all cross drilled rotors have holes all the wya through the rotor surface. Some have only a dimple. This will make the rotor much stronger and less prone to cracking.

Good luck with whatever you choose.

PS i use the Bear Pro brake kit The ultimate in stoping power 60-0 in less time than it takes you te read "it".

[JoeWagon]

Well, surface area doesn't affect friction, so I vote get both. Highly respected brake companies manufacture cross drilled and slotted rotors, so they must not be bad.

[89Turbo944]

Surface area does affecr friction. The less surface area for the pad to contact the less friction.

They are not bad but most are just for the look rather than increased brake performance. Tehy will claim things like they increase brake cooling, and longer rotor life but not better braking force of shorter stoping distance.

If i take a solid piece of steel andput a pad on it, the pad is contacting the intige area that the pad can contact, creating the highest friction possible. But if i take the same piece of steel and but grooves and holes in it there is much less surface area for the pad to contact, there for less friction and less stoping power.

Cross drilled rotors are almost intirly usless unless you put some serious heat into your rotors. They will not work as well as conventional rotors at lower tmeps, rahter they will be worse.

Like i said before go with just sloted, there tends to be more surface area with a sloted rotor, it allows the gases to disapate, helps in cooling a little, looks good, and will not crack like a cross drilled rotor.

[BoostedSpyder]

whatever you do don't get green/red stuff, they dust like hell. i was cleaning my rims every other day just from daily driving!!

[89Turbo944]

They dust like that because they are made of a very soft compound. The plus side of having a softer compound is that it will bite better. But the downside is that they will wear faster and create more brake dust.

As i see it just run oem pads for day to day driving, and greenor reds on the track.

[BoostedSpyder]

the only real option for better braking in our rides is to get a bigger rotor/caliper upgrade. what was said about the surface area is right. and getting slotted/crosdrilled rotors only lessens the amount of the tiny bit of area we have. if you are going to spend the $$, save a little more and get the AEM upgrade, and try to find some GSX 2 piston calipers to save $$ on new ones... and steel lines too... i have slotted/dimples on the front and slotted/crossdrilled on the back and went through a set of greens in 3 months [< 5k mi] and there is not that much difference in the brakes. everytime i get a new car, i give it a thourough brake check to get to know the car, so i won't be suprised if the need arises. yes there is a difference. yes i wish that i would have just gotten the AEM upgrade instead of blowing the $$.

[89Turbo944]

Well if you are really looking to get the ultimate in brake upgrades for the Eclipse go with a Bare Pro kit. Full on big brake kit.

[JoeWagon]

sorry i didn't reply earlier.. but surface area does not actually increase friction. search google if you don't believe me.

http://www.google.com/search?sourcei...+area+friction

[89Turbo944]

No surface area does not increase friction, it increases the area that friction is applyed to, there for it will have the effect of increasing friction.

The larger the surface area the more frictional force that can be applyed to it. Its physics. And it is a fact.

[JoeWagon]

I encourage you to use my link for the google search, and you will see that:

Increasing surface area WOULD increase friction, but it decreases pressure, which keeps friction the same.

P = F / A where P = pressure, F = force, A = area

If you double the surface area, you will have half as much pressure, which offsets the additional area to a 0 net gain of friction. (direct proportion)

If you still don't believe me, I'm not making up my own physics laws, and the information is out there

[89Turbo944]

I know that but we were talking about big brake upgrades. Which usualy or in some cases include upgraded brake calipers which increase the force applyed to the pad. Whic in tern puts pressure on the rotor.

[Spectrum]

Normal non slotted, non drilled rotors remain the best choice for a street car. Drill = cracks, slot = pointless since modern pads hardly gas at all.