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fazzman2000
CEG'er

Reged: 07/17/02
Posts: 205
Loc: orlando
Slotted Rotors - Revisted
#484458 - 12/20/03 08:15 PM

Please read this entire thread as it addresses common misconceptions! And again be sure to read the FAQ
-Andy


The only thing i have heard bad about the slotted rotors is that they eat the pads just a tad bit faster, but they do help in performance. Is there any truth to this? I doing my front and rear brakes and want to upgrade it to have good street performance. Im going to be running Hawk HPS pads with whatever i go with.

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01 Focus MTX
JRSC, 2.6 pully, and so on.......

Edited by Andy W. (01/05/04 10:56 PM)

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Kremithefrog
I have no life

Reged: 05/14/02
Posts: 21653
Loc: Albany, Georgia
Re: Sorry to ask- Brembo slotted rotors new
#484543 (Re: fazzman2000) 12/20/03 10:58 PM

From what I hear they don't help much/at all for street performance and they will eat up pads.

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98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)

FS: SVT rear sway bar
WTB: Very cheap beater

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RogerB
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Reged: 10/21/00
Posts: 3867
Loc: Wichita, KS
Re: Sorry to ask- Brembo slotted rotors new
#485472 (Re: fazzman2000) 12/22/03 06:12 PM

What Kremit said. They are not as problematic as the Cross-drilled rotors, and they actually do have a performance benefit under some circumstances.

But they do cause your pads to wear faster, and they are not optimum, performance-wise, for anything but the most extreme, high speed, repeated-hard-braking situations. Hence, you probably don't "need" them.



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Function before fashion.
'96 Contour SE

"Toss the Contour into a corner, and it's as easy to catch as a softball thrown by a preschooler." -Edmunds, 1998

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JohnnyBravo
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Reged: 12/18/03
Posts: 139
Loc: MD Go Terps!!!!
Re: Sorry to ask- Brembo slotted rotors new
#485817 (Re: fazzman2000) 12/23/03 03:31 AM

Mod Edit: There are many misconceptions in the statement below, see Silver Snake's explanation further down.


All the slots are for are for additional cooling (more air flow & surface area) and will only benefit you in an instance where you're using your brakes a lot such as a track event, auto-x, racing, et cetera. For a daily driven car they're a waste and overkill IMHO. As the other posters mentioned they'll wear the pads quicker than standard rotors, will typically warp easier since they're not quite as sturdy, and can potentially crack near the slots too thus making them not as structurally sound (although not nearly as likely compared to cross-drilled ones). They do look kinda good though so if that's what you're going for then I suppose they can be worth it then. Just my $.02

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Ben
*now* '00 CSVT T-red/tan #1684/2150
*sold* '92 Galant VR-4 #580/1000
*sold* '93 FD3S TT

Edited by Andy W. (01/05/04 10:49 PM)

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airman1
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Reged: 10/02/02
Posts: 71
Re: Sorry to ask- Brembo slotted rotors new
#485998 (Re: JohnnyBravo) 12/23/03 10:08 AM

Originally posted by JohnnyBravo:
...




Mod Edit: There are many misconceptions in the statement below, see Silver Snake's explanation further down.


Slots are there to help remove the fumes and brake pad vapor occuring after hard braking, thus helping in cooling of the pads not rotors/discs/ Will slotted rotors crack easier than non-slotted ones? Maybe, but slotts are not that deep for that to be of a concern. Drilled rotors, regarding cracking, are acctually safer that non drilled because crack would stop at the hole and would not spread, while non-drilled rotors if they crack, it's over. Rotors are drilled for weight savings and looks alone, there is no heat benefits in drilloing of the rotors. There is one concern with drilled rotors. Moisture, and water dropplets can accumulate in those holes and eventually end up under pads, thus creating a problem. Loook on the race cars, those that use cast iron rotors, theirs rotors are not drilled, maybe just slotted but that's also rare. I have to admitt though both slotted and drilled rotors look cool, would I spend maoney on then? No way better by better pads and brake fluid. And please, once more, rotors do not "warp"! Why? Because they can not, they are made of iron, not steel, iron, unlike steel, can crack but can not "warp" at least not on those temperatures, it's the stuff called cementite that accumulates during high temperature braking, a brake padd material gets transfered to the rotor, usually very unevenly thus, creating vibration and brake pedal pulse. I hope this helps.

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airman1
Black '95 Mondeo
V6Si

Edited by Andy W. (01/05/04 10:49 PM)

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fazzman2000
CEG'er

Reged: 07/17/02
Posts: 205
Loc: orlando
Re: Sorry to ask- Brembo slotted rotors new
#486000 (Re: airman1) 12/23/03 10:47 AM

Good stuff, thanks for the info everyone. Im just going to go with brembo blanks.

--------------------
01 Focus MTX
JRSC, 2.6 pully, and so on.......

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airman1
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Reged: 10/02/02
Posts: 71
Re: Sorry to ask- Brembo slotted rotors new
#486004 (Re: fazzman2000) 12/23/03 11:33 AM

Can't go wrong with Brembo's (damn this sounds like bimbo's)

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airman1
Black '95 Mondeo
V6Si

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Silver Snake
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Reged: 07/21/00
Posts: 196
Loc: Wixom, MI
Re: Sorry to ask- Brembo slotted rotors new
#486041 (Re: airman1) 12/23/03 02:12 PM

Originally posted by JohnnyBravo:
All the slots are for are for additional cooling (more air flow & surface area) and will only benefit you in an instance where you're using your brakes a lot.....




Actually, slots are not for cooling, airflow or surface area. Slotted discs are used to clean the pad or "wiping the fire-band" as its called in the industry. The slots sole purpose is to clean the top layer of the pad, and prevent glazing of the friction material surface. By maintaining a clean even surface, friction level or mu can be kept more consistent from stop to stop.

Originally posted by airman1:

Slots are there to help remove the fumes and brake pad vapor occuring after hard braking, thus helping in cooling of the pads not rotors/discs/...




No they are not. Please see above. Fumes are no longer an issue with modern brakes (last 20yrs), as pad out-gassing doesn't occur due to new manufacturing techniques and materials.


Originally posted by airman1:
Will slotted rotors crack easier than non-slotted ones? Maybe...



Yes. Always.

Originally posted by airman1:
Drilled rotors, regarding cracking, are acctually safer that non drilled because crack would stop at the hole and would not spread, while non-drilled rotors if they crack, it's over.




This just isn't correct. There are too many factors at play. I can show you drilled rotors that show crack propagation twice as big as solid rotors. It has to do with rotor design, cheek thickness, venting design, etc. There are too many factors at play to simply say "X rotor is better because its drilled"


Originally posted by airman1:
Rotors are drilled for weight savings and looks alone, there is no heat benefits in drilloing of the rotors.




Wrong. Appearance plays a major factor in rotor cross-drilling, that much is true. However, for automotive use (not motorcycle) weight is never a factor. The weight savings from a drilled rotor is insignificant. Its done for appearance and slight performance gains. If the rotor is thermally sized properly (i.e., it has enough thermal mass), x-drilled holes allow for slightly quicker cooling (at a loss of thermal mass). However, they will crack quicker than an identical solid faced disc. The performance gains are slight, and not one that will be noticed by even the most discriminating street driver.


Originally posted by airman1:
There is one concern with drilled rotors. Moisture, and water dropplets can accumulate in those holes and eventually end up under pads, thus creating a problem.




Actually, testing performed by both Brembo and Porsche has shown that x-driled rotors offer improved perfomrance in wet effectiveness. In simple terms, it gives moisrture and water vapor a place to go, instead of forming a boundary layer under the pad.


Not trying to be a jerk, just trying to "correct the tech".

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Very few of life's problems can not be solved with the reasonable application of more horsepower!


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R_G
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Reged: 05/02/03
Posts: 5621
Loc: New Jersey
Re: Sorry to ask- Brembo slotted rotors new
#486320 (Re: Silver Snake) 12/23/03 07:27 PM

Good info, Snake.

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MY CAR

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Silver Snake
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Reged: 07/21/00
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Loc: Wixom, MI
Re: Sorry to ask- Brembo slotted rotors new
#486324 (Re: R_G) 12/23/03 07:47 PM

Any time.

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Very few of life's problems can not be solved with the reasonable application of more horsepower!


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