Brake Rotors with holes in them? - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 04-19-2004, 07:42 AM
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I need to get new rotors for the back but the front is good for a while. Can I put the ones with the holes just on the rear for now? Do those holes reduce stopping a little since there is a pinch less surface area? Tks-
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#2 (permalink) Old 04-19-2004, 08:03 AM
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They provide better ventilation so you can stop better after driving for a little while.

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#3 (permalink) Old 04-19-2004, 09:18 AM
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it shouldn't be a problem only having them in the rear if you do "light" driving. If you are really using them alot though you may notice the front fading but the rear not, i' not sure if that would bother you while driving.

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#4 (permalink) Old 04-19-2004, 09:18 AM
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The advantage to the cross drilled rotors is that they have better ventilation to they don't get so hot and don't fade.

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#5 (permalink) Old 04-19-2004, 10:24 AM
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The disadvantage to cross drilled is that they easily get warped. Or sometimes even crack. Plus it is not really recommended to install cross drilled in the back and run factory in the front. Third, if you decide to go cross drilled all the way around, pick high performence brake pads for them too, such as PAGID racing, or hawks performence.


Another great alternative to cross drilled and OEM rotors is Slotted rotors . They are very good and have less wear and tear on them.
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#6 (permalink) Old 04-19-2004, 04:08 PM
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Quote:
Originally posted by roguesniper1@Apr 19 2004, 10:04 AM
The disadvantage to cross drilled is that they easily get warped. Or sometimes even crack. Plus it is not really recommended to install cross drilled in the back and run factory in the front. Third, if you decide to go cross drilled all the way around, pick high performence brake pads for them too, such as PAGID racing, or hawks performence.


Another great alternative to cross drilled and OEM rotors is Slotted rotors . They are very good and have less wear and tear on them.
There is absolutely no problem installing cross drilled rotors in the back and leave front stock. I went with corss drilled on 2 different cars (bimmers) now with no problems - they don't crack. (I use zimmerman not brembo) (brembos are known for cracking).

You don't want to use original pads on cross drilled, because bmw original rotors are made of very hard metal that you can't even machine them, so original brake pads are very hard and metalized - thus will eat rotors fast, so you need aftermarket pads. Also do not use Racing grade pads (as mentiont above) as you will not get optimum sotpping - they work good only in higher temperatures and not good on the streets. (not to mention cost way more).

If you decide on sloted rotors -> get ready to change your brake pads 3x more often, as the wear out extremely fast.
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#7 (permalink) Old 04-21-2004, 02:15 PM
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Actually cross drilled brake worse then stock, and heat up more then stock, believe it or not.

The holes not only leave you with less surface to brake with, but there is less metal there to absorb the heat from the friction. The purpose of cross drilling is to vent gases from the pads caused by the heat. Slots in the rotor work more effectively, but are harder on the pads. Most pads now a days don't get hot enough to even require slotting or drilling, so it's mostly a show thing.

Cross drilled is a gimic, Brembo themselves has said that they're worse, they only make them because people want them. Slotted is the way to go. Go to a race, look at the brake rotors, see how many teams run cross drilled....extremely few, to none.

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#8 (permalink) Old 04-21-2004, 02:48 PM
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thinair summed it up well.

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#9 (permalink) Old 04-21-2004, 06:31 PM
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This is from my another post. This will do.

ROGUESNIPER1 WROTE
Quote:
No offense to anyone above but slotted rotors are always recommended over drilled ones. Cross Drilled rotors are only for show if used for regular street driving. Normal driving or even spirited driving never ever make the rotors hot enough so they can benefit from the cross drilled holes.

To top it of cross drilled rotors are always prone to crack or warp under regular street use. Dosen't matter brembo or autowerke floating rotors.

On the other hand slotted rotors are always better, because they are more solid, and thats why don't easily warp or crack. Slotted rotors also provide even brake pad wear and perfect stoping every time. Yeah, they might eat brake pad little more than the regular or crossdrilled ones under heavy spirited driving. On normal use no one is gonna notice the difference that much. Plus, what is better, little less life for the pads combined with perfect balance braking with security or show off rotors with holes, which are prone to warp or crack more than ever and have not much use in daily driving.

PS: majority of the high performence cars use (ultimate) cross drilled/slotted rotors and thats why the factory dosen't mind them.*
another one:
Quote:
QUOTE (bimmer_boy @ Apr 16 2004, 01:33 AM)
Seeing as how Porsche uses them on their cars (cross drilled) they can't be TOO bad for daily driving. They look nice also.

PS

There's nothing wrong with buying something that adds a bit of beauty to your car. It doesn't mean you're a show-off.*
ROGUESNIPER1 WROTE
Quote:
Porsche uses top of the line brake technology. They use cross drilled and slotted rottors. Not just cross drilled. I am not in the mude to argue, but the whole net is filled with people who had bad experience with cross drilled rotors when not used properly. Specially when cross drilled is combined with average brake pads.

Plus, I agree with the beauty part, but cross drilled dosen't add beauty, but reflects showing off just as riceness unless you are really a H4RC0R3! and use it.


right from tire rack:

NOTE: Brembo Sport drilled brake rotors are not recommended by The Tire Rack for track use or intended to be used in conjunction with race compound brake pads on the street. For severe duty brake demands see Brembo Sport slotted brake rotors.

PS: BIMEROCK is an IDIOT
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#10 (permalink) Old 04-21-2004, 06:38 PM
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Quote:
Originally posted by roguesniper1@Apr 21 2004, 07:11 PM
PS: BIMEROCK is an IDIOT
I thought his post was a little goofy...
I was told by a mechanic at my local tire garage that the BMW rotors are softer than most other cars and made to wear with the brake pads. Whatever.


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#11 (permalink) Old 04-21-2004, 09:01 PM
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Thinair pretty much said it all. slotted are much better as opposed to cross drilled. cross drilled are just a better looking brake rotor. you want to stop better, go bigger, get better pads , or try slotted. i noticed an overall improvement when i went slotted in the front. more control and better peddle feel

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#12 (permalink) Old 05-03-2004, 06:26 PM
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I RECOMMEND A SLOTTED ROTOR OVER A CROSSED DRILLED ALSO. SLOTTED AND DRILLED ROTORS ARE PRETTY SWEET THOUGH WITH MORE STOPPING POWER AND BETTER HEAT CONTROL. THE ONES FROM TAR OX ARE TRIPLE HEAT TREATED AND A GREAT LOOK. B) B) B)
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