03 M45 Cross Drilled AND SLOTTED Rotors?? or just cross drilled?

[eskay]

HelloI just replaced the crappy brakes on my 03 M45 with cross drilled AND slotted rotors with Hawk HPS Performance Pads. The stock brakes were weak and squealed. My question is, should I have just gotten cross drilled rotors instead of slotted as well??

I know slotted rotors will eat pads faster, but does anybody know how much faster. The Tirerack told me that the high end high performance Hawk HPS pads will reduce the wear of the pads as opposed to the stock pads, which will wear much faster w/ the slotted rotors.

I went with slotted b/c this car NEEDS the improvement in braking for being such a large car, and I plan to upgrade to heavier 20" wheels. I was also told that the upgrade from stock to just cross drilled rotors will not be that much, and if I wanted the best performance braking bolt-on option, slottted is the way to go.

But my question again, does anybody have cross drilled AND slotted rotors and can tell me the shelf life b4 they had to resurface and replace pads? Does anybody know what kind of reduced life to expect with slotted rotors as opposed to just cross drilled?

[cremecreme]

i have had cross drilled and slotted on my Acura and the braking was way better, i did buy them from ebay and next time i will make sure that they have sometype of rust proofing cause they looked like crap after about a month. I am sure the factory ones are made to last way longer, but i liked the look and short term performance....I am tempted to get some of off Ebay and see how they do...

[GJEMD]

I'm assuming your new rotors are larger diameter and you also put on bigger calipers.This should give you improved braking. Drilled and slotted rotors are for heat dissipation from aggressive braking on a road course. The heat makes the brakes fade from boiling brake fluid. The front brake rotors may be too small for stopping this powerful sedan but its not clear to me how drilled and slotted rotors will change the braking under routine operations.

[eskay]

I understand the improvement in extreme braking is significant, but everyday use is also improved with aftermarket drilled rotors. I had a 97 Supra TT with aftermarket cross drilled rotors and the difference in braking was highly noticable. I had the same very high performance Hawk HPS pads on the stock OEM rotors as well as later the cross drilled one's. I could easily tell that the cross drilled rotors were MUCH better than stock in everyday braking, and especially in hard braking. Sure, larger calipers and a complete big brake upgrade will be even better, but aftermarket rotors and pads do make a significant difference in braking perfromance than plain stock.

But my question is, what will the slotting of the rotors do to the pad life of the HPS pads, as opposed to just cross drilled? Does anybody have any experience in this? not just conjecture?

[HolySh*t]

Where did you purchase the rotors from? I didnt see rotors on Tirerack.

I am starting to hear squeaks from my rear brakes so I will be changing them soon. Can someone with a service manual email me or post the pages on the site? I will be ordering the parts tomorrow and would like to change them out this weekend.

thanks

[export01]

While were on the subject, for those who purchased rotors from ebay. I was looking to purchase the drilled rotors and buy some pads becouse the G35 rims I justed put on are more visable now since they rims have one less spoke. My stock rotors are fine so tell me if I am crazy. Should I stay away from the ebay cross drilled rotors just to get a couple style points?? I also worry about the rust when not used becouse the car sits alot so is this something with the less expensive alloy I should also avoid?

[export01]

Here is a picture of what I am talking about

[auditech10]

I like the wheels! I got my cross drilled and slotted rotors from R1 Concepts on Ebay a few months ago. They are great for the price. I put mine when it was snowing and rarely drove my M due to my bald tires. They did stay rust free until it stopped snowing then a month ago or so they started to rust a bit. Rust isnt too bad just drive and brake a few times and it goes away. Most rotors will eventually rust anyway if you are in an area that uses salt for snow/ice.

[caug]

03 M45 Cross Drilled AND SLOTTED Rotors?? or just cross drilled?

drilled rotors not as strong as just slotted, so with m45 being 4000lbs with driver. they could crack.i would go with slotted.good luck.

[szh]

Some years ago, I got cross-drilled and slotted rotors from http://www.irotors.com for my Q45. These were Bradi rotors (sister company of Brembo) and I was happy with them (only used them for a few thousand miles though, as I recall). I don''t know if they have them for the various M models, though.

The most important thing to remember is that the weight of the rotor blank is important - it has to absorb heat too. So, if you start with a low-weight, low-quality iron blank and then remove some of it (with either cross-drilling or slotting), then its heat capacity goes down. And, fade/breaking is more likely!

So, I think that it is best to minimize the weight removal. If I had to make a choice, I would pick slotted-only now, in hindsight. Although, if the rotor blank was a good brand, with high-quality iron, etc., I think it would not be a bad thing to do cross-drilling either, as long as the drilling was done with a chamfer to prevent cracking.

Finally, if you think you are experiencing "rotor warp" or vibration, etc., even with stock rotors, then it is very useful to get a good brake technician to true the rotors and break the pads in properly when installing. The last Tech who worked on my M45 was excellent! It has been 13k miles since the work was done, and my car is behaving perfectly - no vibration and no problems with fade, even with hard braking!

Z

[lswaidz]

If you're thinking about doing new rotors I would seriously consider Burtman. I have his cross drilled rotors on my M45 and they are phenomenal. Shipping took a couple weeks, but that's because he custom makes every set which is nice. These aren't the cheap crap you get off eBay that warp in a week, they are strong and look amazing. Check them out at http://www.burtmanindustries.com/index.php. Now Jason has to give me that M45 spoiler for free! Haha.

Lance

[auditech10]

Ive worked on a car that had OEM rotors warp in one week and never had problems with "ebay rotors". It all depends on how you drive the car, there are people out there that really ride their brake pedal and they get problems like that.

[Jason B]

If you're thinking about doing new rotors I would seriously consider Burtman. I have his cross drilled rotors on my M45 and they are phenomenal. Shipping took a couple weeks, but that's because he custom makes every set which is nice. These aren't the cheap crap you get off eBay that warp in a week, they are strong and look amazing. Check them out at http://www.burtmanindustries.com/index.php. Now Jason has to give me that M45 spoiler for free! Haha.

Lance

Glad you like this, and yes, they are awesome and work great.

http://www.burtmanindustries.c...02_up

[M35Man]

I personally like the slotted rotors from PowerSlot. Everyone I know that has used these has seen such an improvment over the stock. Drilled rotors have a tenancy to warp over time because they are drilled through from side-to-side. I wouldn't worry about it, you'll be satisfied with the slotted rotors and Hawk pads.

[HolySh*t]

The most important thing to remember is that the weight of the rotor blank is important - it has to absorb heat too. So, if you start with a low-weight, low-quality iron blank and then remove some of it (with either cross-drilling or slotting), then its heat capacity goes down. And, fade/breaking is more likely!Z

What weight range is sufficient enough for blank rotors? I am considering purchasing drilled and slotted rotors on E-bay and would like to know if they will be ok.

http://cgi.ebay.com/ebaymotors...wItem

or

http://cgi.ebay.com/ebaymotors...wItem

[Jason B]

I will say you need to be careful when buying stuff like this on ebay (I've seen people sell imitations and brand them as something else). I'm not saying this is in every case, but it's happened.

Another thing is warranty issue, if there is one, you could be stuck, on this type of item.

Here is another guy that had a chance to post on them.

Burtman Rotors and Pads Review

.