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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 05-02-2012, 06:35 PM   #1
2MCHM4U
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Cross Drilled Rotors

Just looking for suggestions on where to buy. Im looking at front and rear and dont want the oem zcp as they are out of my price range. unless you guys know where i can get a good deal on them. Thanks
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Old 05-02-2012, 06:38 PM   #2
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you can look at zimmerman cross drilled, and check out bavauto as well, i think they have a pair

just let it be known they these will be strictly for cosmetic purposes... you will not brake better, in fact, you will probably brake a little worse, and low quality cross drilled rotors are more prone to cracking... i have thought about them a lot, and for the right price since i don't track my car, i MIGHT be purchasing them off of another member, but if i were to choose, go with OEM normal brakes... they are great
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Old 05-02-2012, 06:42 PM   #3
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Thank you for the info. I was thinking cosmetic but now im wondering how much loss of braking power. i dont track the car but i dont want to have less stopping power either. If i did end up going with the zcp rotors, will they work with my stock calipers?
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Old 05-02-2012, 06:48 PM   #4
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i am fairly certain they will work just fine... and if i'm not mistaken, don't the zcp's only come with front cross drilled? if so, you can throw the cosmetic part out the window because that obviously isn't going to look right

do a little research.... i'm sure you will be ok not tracking the car, but i've seen my share of cracked rotors, and god forbid that happens the day i really need to use them... ya, no thanks... not worth the "cosmetic" part of looking at brake discs when the car is in a driveway or a parking lot
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Old 05-02-2012, 06:58 PM   #5
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i had a e36 M3 with crossed drilled back when i was young and i had my fair share of smashing on the brakes and didnt ever crack them and they were from zimmerman. When you say you have seen cracked rotors has this been on the e46 or are you speaking just in general?
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Old 05-02-2012, 07:00 PM   #6
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few e46's, but more so in general...

honestly, i don't want you to think that these brakes are junk, but the structural integrity of them are impaired by being cross drilled. i just didn't want you to be under the impression that they are better in any way other than looks compared to OEM. Realistically speaking you will probably be fine, especially from a company who is well established, but at least know that the quality and performance will mostly likely fall somewhat short of OEM
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Old 05-02-2012, 07:23 PM   #7
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great info JJ. Thanks again
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Old 05-02-2012, 07:47 PM   #8
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Front cross drilled also available from UUC. 6k on mine,no cracks. Not sure about availability of the rear. Also I think ZCP fronts are larger diamater,but the rears are the same. Just search to confirm before making a purchace.
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Old 05-02-2012, 08:59 PM   #9
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Installing ZCP rotors on a non-zcp M3 will require a caliper bracket (2).

Part No. 34112282619
Issue - Each
MSRP - $269.15
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Old 05-02-2012, 09:06 PM   #10
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ZCP have cross-drilled all the way around.

Larger on front than back.

You should be able to use the rear ZCP rotor on the front (but don't quote me on that) on a regular M3. As mentioned above you will need a larger carrier (essentially all the front ZCP brake hardware) if you want the larger front brakes.

OEM ZCP rotors are forged with the holes instead of drilled. They are very strong. They will never crack.

Other rotors, if they are drilled *after* forged will be prone to cracking. Good luck.

Last edited by mooninite; 05-02-2012 at 09:08 PM.
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Old 05-02-2012, 10:57 PM   #11
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Check the for sale section on this forum for brakes. I may or may not have a set up for sale.
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Old 05-03-2012, 12:39 AM   #12
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Do your wheels even let you see your brakes? If not don't waste your money. But if you CAN see them then yes they look great. You should paint your calipers while your down there too. G2 paint is great. Pick a nice color. I'm thinking about going gold on my Topaz Blue M3. Don't do red though. It's played out and too wannabe Brembo.
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Old 05-03-2012, 02:31 AM   #13
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Quote:
Originally Posted by JJR4884 View Post
i am fairly certain they will work just fine... and if i'm not mistaken, don't the zcp's only come with front cross drilled? if so, you can throw the cosmetic part out the window because that obviously isn't going to look right
do a little research....ya, no thanks... not worth the "cosmetic" part of looking at brake discs when the car is in a driveway or a parking lot
the M3 CSL brakes stop in a shorter distance than stock M3s.
CSL/ZCP brakes are not cosmetic. They will resist fading and being a few pounds lighter rotational mass is also a plus. They are perforated on all four corners and floating hat design.

Quote:
Originally Posted by mooninite View Post
ZCP have cross-drilled all the way around.
Larger on front than back.
You should be able to use the rear ZCP rotor on the front (but don't quote me on that) on a regular M3. As mentioned above you will need a larger carrier (essentially all the front ZCP brake hardware) if you want the larger front brakes.
OEM ZCP rotors are forged with the holes instead of drilled. They are very strong. They will never crack.
Other rotors, if they are drilled *after* forged will be prone to cracking. Good luck.
Yes CSL/ZCP rotors are not only directionally vented internally, but also perforated and have aluminum floting hat design. So it doesn't hold the heat on the rotor or heat the hats, hubs and bearings. They are also lighter.
ZCP rotors are rear specific and will swap without needing anything. But to do correctly you'd want the ZCP rear cailpers which have a larger piston. The fronts are specific and need new carriers for the larger rotors.
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Last edited by Alex323Ci; 05-03-2012 at 02:33 AM.
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Old 05-03-2012, 12:23 PM   #14
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I have our ECS Cross Drilled & Slotted Brake Rotors avaible for the E46 M3, I think these might fit your budget and provided you everything you're looking for. Also just a heads up right now I'm shipping these rotors free inside the continental USA. HERE is a custom cart with the front and rear rotors dropped into it for you to review.



Quote:
Originally Posted by turbo_f22_pilot View Post
Installing ZCP rotors on a non-zcp M3 will require a caliper bracket (2).

Part No. 34112282619
Issue - Each
MSRP - $269.15
This is a very good point and something the OP needs to take into account if he choose to go with the ZCP upgrade.
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Old 05-03-2012, 02:06 PM   #15
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Im selling my rear zcp rotors, now just find the front rotors

http://www.m3forum.net/m3forum/showthread.php?t=404408
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