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Discussion Starter · #1 ·
I just got my brembos the other day from Mr. Wood and I thought the slots were going to go all the way through the rotor and then have dimples in them as well...

Turns out that the slots were only indentations like the dimples...

I would imaging that brembo knows what they are doing...I just thought that other owners were getting slots that go straight through?

Wont the grooves cause more air pockets to form when the brake hits the surface?
 

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Mine came this same way. At first I really didn't get the concept of this, but now adays you do not need holes drilled all the way through because gases do not build up like they did before. The main reason I guess for the extra holes and slots would be to push the brake dust away from the rotor for better braking.

I haven't had any trouble with my brakes yet and I've put them through a lot of heavy usage.
 

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Yaozer *n *he A*k
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I believe I've only seen slotted rotors w/ cuts all the way thru on sport bikes, but not on cars. It would probably weaken the integrity of the rotor if it did have slots cut thru it. Like legendary said, probably won't get that much buildup of hot gases anyways with crossdrilled and indented slots already.
 

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drilled rotors WILL crack. too much temp stress, it happens and weakens the rotor causing too crack.
 

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Discussion Starter · #5 ·
Great, thanks for the help guys...just wanted to check before I started installing them. :)
 

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0000$$$$0000####0000
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smoovie--smoov said:
drilled rotors WILL crack. too much temp stress, it happens and weakens the rotor causing too crack.
I think a better word to use is CAN crack depending on quality. Of all the Legend owners I personally know, none have cracked a drilled rotor yet. Some have well over 30-40K miles on them as well. But then again, I know Civic owners who bought cheap drilled rotors and craked them in a few months.
 

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Yes, ChrisK is right. Like I mentioned in another thread (Rotors Help), the quality of a X-Drilled/Slotted rotor is dependent on the 3rd-Party Manufacturer who does the X-drilled and/or slotting of the rotor. As a guess, I would suspect his last few sets of X-Drilled/Slotted Rotors have been no good and thus have had a few complaints.

I have around 15K miles on mine and they have yet to crack. I still have 60% left on my pads using those same rotors (for those that have questions about x-drilled rotors cutting up the pads).

Just for comparison reasons, my OEM rotors would warp in about 2 months, and I've had mine for 8 months, and they have yet to warp.

ChrisK said:


I think a better word to use is CAN crack depending on quality. Of all the Legend owners I personally know, none have cracked a drilled rotor yet. Some have well over 30-40K miles on them as well. But then again, I know Civic owners who bought cheap drilled rotors and craked them in a few months.
 

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asianlegend, what make/model rotors do you have??
 

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Octane said:
asianlegend, what make/model rotors do you have??
As the signature suggests - 1994 Legend L Coupe using Brembo/Brady X-Drilled/Slotted Rotors (Front) from Mr. Wood. This was prior to his decision to switch to Dimpled/Slotted Rotors. I intend somewhere at the end of the summer when I replace my rear pads to also replace my rear rotors with Mr. Wood's Dimpled/Slotted Rotors.

The Front Rotors alone cost me $125/pair. Silver-Cadnium Plated Rotors. The Rear Rotors (if he still had'em available for X-Drilled/Slotted) would've been $100/pair. The semi-metallic pads from him are made by PBR (same company as Axxis) for $35/pair for either front or rear.

The new dimpled/slotted rotors he sells is a lot less, at a cost of $60/pair for the rears in the GroupBuyCenter.com GroupBuy and around $70/paid for the fronts. I am not sure of the effectiveness of the dimpled versions, but for my rears, it's ok, simply because 70% of the braking is done in the front, so that's what counts the most to me!
 

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Cool, thanks for the info (but I don't see that in your sig....am I missing something?)
 

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Oh I meant the make/model of the car. The make/model of the car will get you the right rotors. So, asking Mr. Wood for a set of 94 Legend L Coupe rotors and you having a 91 (just an example) Sedan is going to do you no good, since you got to have the ones that match your car.

Octane said:
Cool, thanks for the info (but I don't see that in your sig....am I missing something?)
 

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speaking of which, my buddy just sold his 91L coupe (bought a 01 bmw 328CI) and he still has a set of vented slotted rotors. Would they fit my 91 L sedan or no??

In more general terms, what G2 Legends can swap rotors??
 

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Rotor quality

asianlegend said:
the quality of a X-Drilled/Slotted rotor is dependent on the 3rd-Party Manufacturer who does the X-drilled and/or slotting of the rotor
It doesn't matter who drills the holes. Holes are holes as long as they are drilled inbetween the rotor veins and not through the veins. Cracking is linked to a bad rotor casting, which would be the responsibility of the manufacturer = Brembo. The quality as far as structural integrety is concerned is dependant on the casting process.
 
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Hmmm, I just bought my rotors from Wood thinking that they were cross drilled :(. I have heard good things about his cross drilled ones before and haven't heard anything about them breaking so I wouldn't have minded if he took the risk by drilling all the way through. Anyways, I'm sure that they'll be way better than what I have. I just have to find some Dot5.1 fluid now.
 

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Discussion Starter · #15 ·
Well, got all my rotors installed...Have yet to try them out because I just finished at 10:30pm tonight (got a late start).

I wont be able to perform the seasoning process for a few days from the looks of the tutorial...need to break them in with some normal driving...

Now all I have to do i clean my ugly ass calipers and give them several coats of this 1200° "Cast Iron Black" color paint I picked up...

Then, and only then will the setup look clean.
 

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I just recieved my dimpled/slotted rotors today and am disappointed. I might return them or sell them. I really wanted X-drilled all the way through. I don't think these look very good, and I can't imagine the dimples help. It just seems like brake dust will collect in there and they will serve no purpose. They look cheap to me. Any one else have opinions on them? Right now, I am just kinda pissed because they are not what I asked for and expected. Oh well..
 

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Discussion Starter · #17 ·
I was thinking the same thing at first..but now that I have them on, I like them. Took a little while to break them in this morning...but already they are becoming very smooth.....much better than my OEM rotors and pads....

I cant wait for the performance break in period though...
 

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THIS IS FOR EVERYONE:

BE SURE TO PREP YOUR ROTORS AND BE NICE TO THEM BEFORE YOU THRASH THEM TO PROVIDE LONG-LIFE TO THE ROTORS AND LONG-LIFE TO THE PADS

For the performance factor, the rotors work best when heated up, since the whole purpose of the slots and the holes is for added overheating protection and better heat dissipation. So, don't expect it to work any better than OEM when the rotors are cold and not pushed so hard, in fact, some of us have noticed that on easy (and relatively cold) braking, the OEMs are better than the X-Drilled/Slotted. But, rarely does no ones brakes get hot.
 

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Re: Rotor quality

Bread said:
It doesn't matter who drills the holes. Holes are holes as long as they are drilled inbetween the rotor veins and not through the veins. Cracking is linked to a bad rotor casting, which would be the responsibility of the manufacturer = Brembo. The quality as far as structural integrety is concerned is dependant on the casting process.
Interesting point of view. The point of view that drew the conclusion that I had drawn was asking several so-called 'brake' experts. I had heard your point of view before, but I didn't get enough conclusive evidence to think that it really was Brembo or some brake manufacturer's fault.
 
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