F1 Autohaüs |Slotted vs X-Drilled vs Slotted/X-Drilled Info
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From: Arlington, TX
My Ride: 2005 330I ZHP
Well, I have been lately getting alot of emails and PM about what is the Difference between the 3. So here it is.. 
X-Drilled Rotor
Slotted/X-Drilled Rotor
-Anthony@F1 Autohaus
Slotted Rotor
- The slots on the rotor helps clean the brake pad, which improves bite.
- The slots on the rotor will slice the brake pad allowing the pad to bite harder into the disc causing an increase in disc temperatures. This will bring your brakes up to temperature faster , but might also take you too far decreasing the benefit. The slotted rotor coupled with a race pad which need to be heated would be optimum.
- Slotted rotors will also cause slightly more brake pad wear and tear giving you less miles on a pad before it needs to be replaced. Shorter maintenance schedule.
- Slotted rotors allow gas to ventilate during brake fade.
- Slotted rotors are less prone to cracking then the cross drilled rotor.
- Slotted rotors weigh more.
- Slotted rotors have more disc surface.
- Slotted rotors maintain around 96% of the friction surface
X-Drilled Rotor
- Drilled Rotors offer an enhanced initial bite.
- Drilled Rotors perform better in wet weather over the slotted rotor. Due to volume of a hole vs a slot.
- Drilled Rotors are more prone to cracking than slotted.
- Drilled Rotors allow gas to ventilate during brake fade.
- Drilled Rotors offer a performance benefit since there lighter in weight.
- Drilled Rotors have more ventilation so they should cool off faster , but have less rotor material so they could get hotter than a slotted rotor. But its hard to say as the slotting also increases heat.
- Drilled rotors maintain around 85-93% of the friction surface
Slotted/X-Drilled Rotor
- The slotting will increase rotor heat.
- The drilled holes will increase the cooling after braking.
- The drilled holes will increase the water braking.
- Drilled and slotted are going to weigh less from the same manufacturer. Other designs might be lighter from company to company.
- Drilled and slotted will give the most performance benefit to acceleration due to the lighter weight.
- Drilled and slotted will also be the hardest on your brake pad (wear and tear)
- Drilled and slotted only maintain 80-91% of the friction surface.
-Anthony@F1 Autohaus
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Joined: Apr 2007
Posts: 559
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From: Los Angeles
Originally Posted by Anthony@F1 Autoha?s' post='1021930' date='Oct 1 2009, 04:01 AM
Well, I have been lately getting alot of emails and PM about what is the Difference between the 3. So here it is..
X-Drilled Rotor
Slotted/X-Drilled Rotor
-Anthony@F1 Autohaus
Slotted Rotor
- The slots on the rotor helps clean the brake pad, which improves bite.
- The slots on the rotor will slice the brake pad allowing the pad to bite harder into the disc causing an increase in disc temperatures. This will bring your brakes up to temperature faster , but might also take you too far decreasing the benefit. The slotted rotor coupled with a race pad which need to be heated would be optimum.
- Slotted rotors will also cause slightly more brake pad wear and tear giving you less miles on a pad before it needs to be replaced. Shorter maintenance schedule.
- Slotted rotors allow gas to ventilate during brake fade.
- Slotted rotors are less prone to cracking then the cross drilled rotor.
- Slotted rotors weigh more.
- Slotted rotors have more disc surface.
- Slotted rotors maintain around 96% of the friction surface
X-Drilled Rotor
- Drilled Rotors offer an enhanced initial bite.
- Drilled Rotors perform better in wet weather over the slotted rotor. Due to volume of a hole vs a slot.
- Drilled Rotors are more prone to cracking than slotted.
- Drilled Rotors allow gas to ventilate during brake fade.
- Drilled Rotors offer a performance benefit since there lighter in weight.
- Drilled Rotors have more ventilation so they should cool off faster , but have less rotor material so they could get hotter than a slotted rotor. But its hard to say as the slotting also increases heat.
- Drilled rotors maintain around 85-93% of the friction surface
Slotted/X-Drilled Rotor
- The slotting will increase rotor heat.
- The drilled holes will increase the cooling after braking.
- The drilled holes will increase the water braking.
- Drilled and slotted are going to weigh less from the same manufacturer. Other designs might be lighter from company to company.
- Drilled and slotted will give the most performance benefit to acceleration due to the lighter weight.
- Drilled and slotted will also be the hardest on your brake pad (wear and tear)
- Drilled and slotted only maintain 80-91% of the friction surface.
-Anthony@F1 Autohaus
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Joined: Mar 2008
Posts: 226
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From: San Diego, CA
My Ride: Metallic gray '05 545i Sport Black Leather with HUD, Step, Nav, PDC, CWP, K&N Air Filter, Black RPI scoop, Black painted calipers, 35% F1 Pinnacle tint, 19" RDSport RS-2F rims with Continental ExtremeContact DWs.
Anyone experience rusting in the slots or in the holes?
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Joined: Sep 2009
Posts: 124
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From: Arlington, TX
My Ride: 2005 330I ZHP
Originally Posted by top6491' post='1024920' date='Oct 5 2009, 09:21 AM
Anyone experience rusting in the slots or in the holes?
-Anthony@F1 Autohaus
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From: Hong Kong
My Ride: 530i
Mods: M5 sporty package, M5 Steering wheel, Sprint Booster
Originally Posted by Anthony@F1 Autoha?s' post='1025279' date='Oct 6 2009, 05:23 AM
We don't have a problem with Rust. Just some Pad Dust in the grooves or holes that give it the appearance of rust.
-Anthony@F1 Autohaus
-Anthony@F1 Autohaus
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From: Near Vancouver
My Ride: 2006 Titanium Silver 550i, with all the bells and whistles!!
Thanks Anthony, good information. I am currently scoping out a set of rear brakes and rotors, and was curios about slots and holes. Brembo seems to offer both separately.
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Joined: Sep 2009
Posts: 124
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From: Arlington, TX
My Ride: 2005 330I ZHP
Originally Posted by sleeper50' post='1026180' date='Oct 6 2009, 03:54 PM
Thanks Anthony, good information. I am currently scoping out a set of rear brakes and rotors, and was curios about slots and holes. Brembo seems to offer both separately.
What do u mean Brembo seems to offer both Separately? Thanks
Anthony@F1 Autohaus
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Joined: Oct 2008
Posts: 596
Likes: 0
From: Near Vancouver
My Ride: 2006 Titanium Silver 550i, with all the bells and whistles!!
I saw pics of slotted brembo rotors, and pics of drilled brembo rotors, but did not find pics with both slotted and drilled.???
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