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🎰 Brake rotors: standard vs. slotted vs. drilled (brakes, best, truck) - Automotive -Sports cars, sedans, coupes, SUVs, trucks, motorcycles, tickets, dealers, repairs, gasoline, drivers... - City-Data Forum

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Drilled vs. Slotted Disc Brake Rotors. Without question, brakes are the most powerful system on your vehicle. No matter how much horsepower you have, none of it’s of any use if you can’t scrub off enough speed to keep from rear-ending the car in front of you.
Blank rotors have a larger area in contact with the pads than slotted or drilled rotors. Therefore they provide better braking at the same temperature. Cooling. To cool the rotor, manufacturers use a vented rotor, not a cross-drilled or slotted rotor.
In either case, drilled and/or slotted brake rotors can’t be turned (resurfaced). So when they warp, or as soon as you put on a new set of pads, you will have to replace the rotors. (Most people resurface the rotors at each replacement of the pads.) At least with OEM-type rotors you can resurface them once or twice before having to replace them.

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Time for new pads and rotors after 10 years. There are so many available nowadays, with little evidence of quality, except reviews on Amazon. I’ve seen glowing reports of a drilled and grooved set, with pads, a little over $100. And pretty positive review of standard rotors, with pads, around $75. And some sets for half that, and twice that.
Cross drilled rotors, while beneficial in the past, have been almost replaced by slotted rotors. The reason for this is that cross drilled rotors tend to have problems with cracking due to the stress under extreme use. In a similar fashion, drilled and slotted rotors have the same susceptibility to crack under extreme stress.
If your rotors are shagged it is probably worht spending the extra on slotted in my opinion, when my front rotars went under the machining limit i just got stocko's only to be peeved off a week later when I realised I could have had a pair of slotted rotars from rice barn for about $130 or so on special.
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brake rotors- blank, slotted or drilled? - Motor Vehicle Maintenance & Repair Stack Exchange Drilled and slotted vs standard rotors

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The image on the right shows what can happen with a low quality cross drilled rotor when it cracks. Slotted Rotors Slotted brake rotors are a great alternative to drilled rotors because they serve the same purpose of expelling hot brake gas, but since they retain the strength of the rotor, they do not crack like drilled rotors can.
The cross drilled holes on your Power Stop Cross Drilled and Slotted Rotors are counter-sunk for smoother pad-to-rotor transition as well as reduced risks of stress risers and fractures; Slots provide a direct conduit for gases to flow rapidly away from the center of your Power Stop Cross Drilled and Slotted Rotors
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Brake rotors: standard vs. slotted vs. drilled (brakes, best, truck) - Automotive -Sports cars, sedans, coupes, SUVs, trucks, motorcycles, tickets, dealers, repairs, gasoline, drivers... - City-Data Forum Drilled and slotted vs standard rotors

So we now have solid evidence that drilled rotors have benefits over standard rotors. However, I have not found any published paper to show how slots affect brake output. So I reviewed inertial dynamometer tests using ISO NWI 26867 from Link Testing in Detroit with slotted rotors vs standard rotors.
If your rotors are shagged it is probably worht spending the extra on slotted in my opinion, when my front rotars went under the machining limit i just got stocko's only to be peeved off a week later when I realised I could have had a pair of slotted rotars from rice barn for about $130 or so on special.
Find great deals on eBay for cross drilled and slotted rotors. Shop with confidence.

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drilled and slotted vs standard rotors Brake rotors: standard vs.
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Just wondering if anyone's done a test to see which one is best?
I've heard the slotted and drilled are better than the standards in terms drilled and slotted vs standard rotors stopping.
But what about slotted vs.
With the disc in motion, air should flow thru better then standard drilled holes.
Again just an opinion.
Interesting question though I have.
And my experience is unique to me.
But I've found that the true stopping performance benefit will only be realized on a lighter car - like a Porsche or a Honda or something like that.
The weight of the car seriously influences the effectiveness of drilled and slotted vs standard rotors />I had those on my black Sebring which was about as heavy a car as you can get, and I found they weren't worth much more than the regular rotors.
Heat dissipation is a given, but again, not to such a degree that the cost is justified.
On newer non-sport cars I find them to be useless compared to regular rotors and some good ceramics.
Normally they're sold slotted and drilled.
I've never seen rotors that were slotted without being drilled.
If you have, I would say you're probably not going to get much benefit from them.
Same with the drilled and no slots.
And my experience is unique to me.
But I've found that the true stopping performance benefit will only be realized on a lighter car - like a Porsche or a Honda or something like that.
The weight of the car seriously influences the effectiveness of those.
I had those on my black Sebring which was about as heavy a car as you can get, and I found they weren't worth much more than the regular rotors.
Heat dissipation is a given, but again, not to such a degree that the cost is justified.
On newer non-sport cars I find them to be useless compared to regular rotors and some good ceramics.
Normally they're sold slotted and drilled.
I've never seen rotors that were slotted without being drilled.
If you have, I would say you're probably not going to get much benefit from them.
Same with the drilled and no slots.
I'd wonder if actual wheel design for potential air flow and rolling mass has any importance as well Just wondering if anyone's done a test to see which one is best?
I've heard the slotted and drilled are better than the standards in terms of stopping.
But what about slotted vs.
Are they worth the extra money, for a daily driver?
I don't think so.
But that's just my personal opinion.
Are they worth the extra money, for a daily driver?
I don't think so.
But that's just my personal opinion.
The benefit is that by staying cooler, they contribute less to heating the brake fluid and that is where brake force gets diminished - as it heats up it can cook, boil and loose its effectiveness.
Basically, if you are hot lapping on a track and your brakes over heat, it takes longer and longer for the brakes to stop you because the fluid is less effective.
If the fluid gets too hot, no more brakes.
Sayantsi makes an important point.
In ordinary street use - drilled and slotted vs standard rotors simply isn't an issue.
A single stop from 60 MPH or 80 MPH will not change materially with slotted or drilled rotors.
You take drilled and slotted vs standard rotors car to the track and brake while running laps - then fade becomes an issue.
I'm not sure though that the rotor makes a big difference in brake fluid temperature.
The effectiveness of the brake pad itself changes with temperature and I think this please click for source brake fade more than anything.
Sayantsi makes an important point.
In ordinary street use - fade simply isn't an issue.
A single stop from 60 MPH or 80 MPH will not change materially with slotted or drilled rotors.
You take the car to the track and brake while running laps - then fade becomes an issue.
I'm not sure though that the rotor makes a big difference in brake fluid temperature.
The effectiveness of the brake pad itself changes with temperature and I think this affects brake fade more than anything.
And the same principle applies to some of the top-end ceramic brake pads.
They're just not necessary for your everyday driver.
I'd rather cook 'em and have to take a brake bake break than drilled and slotted vs standard rotors 'em.
I suppose if you were on the track for fame and money or can afford to buy a car that has a serious OEM brake system like the ceramic upgrade on the Porsches, etc that you might want them.
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For the sports sedan, the coefficient of friction was 21% higher for drilled rotors than standard front rotors at 340F and higher using 15 brake snubs at 62mph. The track simulated 124 mph fade test showed 37% better brake output for drilled rotors. The drilled rotor brake temperature was about 150 degrees cooler.
As for the blank vs drilled vs slotted debate, everyone has their own opinions on what is best so it really doesn't matter. Cross drilled rotors are not prone to cracking anymore because no one drilled the holes on a structural vein anymore. The holes are also chamfered so it isn't a sharp edge around the hole.
Time for new pads and rotors after 10 years. There are so many available nowadays, with little evidence of quality, except reviews on Amazon. I’ve seen glowing reports of a drilled and grooved set, with pads, a little over $100. And pretty positive review of standard rotors, with pads, around $75. And some sets for half that, and twice that.

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