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Old 06-21-2010, 12:07 PM   #1
BugeyePB Rex
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Default Need Help Quick! Need To Tuen Slotted Rotors.

Can't seem to find anyone in Phx who will turn slotted rotors. I have dba 5000 series rotors that I KNOW can be turned. Any help/suggestions is appreciated as I have to drive back up to Flag tonight. I'm about to just say screw it and throw new pads on without turning them.
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Old 06-21-2010, 01:25 PM   #2
kpluiten
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I never turn rotors. Most people in the know don't either. Unless they are severely grooved, just save the cash.
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Old 06-21-2010, 01:43 PM   #3
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Originally Posted by kpluiten View Post
I never turn rotors. Most people in the know don't either. Unless they are severely grooved, just save the cash.
+1
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Old 06-21-2010, 03:16 PM   #4
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you don't turn slotted rotors or you dont turn rotors at all?
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Old 06-21-2010, 03:56 PM   #5
Z0rr0
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I don't turn them at all, unless there is a clear and concise problem with the rotor..
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Old 06-21-2010, 04:42 PM   #6
BugeyePB Rex
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Cash isn't the issue I just don't want to have problems when beading in the new pads.
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Old 06-21-2010, 06:09 PM   #7
dan az
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use garnet paper, the feeling of warped rotors is usually a result of cementite buildup from the pads.
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Old 06-21-2010, 06:47 PM   #8
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if you really want them turned, there is a guy in prescott that can do it for you, i think its a and g machining? on valley st in PV
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Old 06-21-2010, 10:06 PM   #9
Momosaurus WRX
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take a really REALLY fine grit sandpaper to em. because like what dan az said, the "Warping" is usually a buildup of brake crap.
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Old 06-21-2010, 10:10 PM   #10
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Originally Posted by Momosaurus WRX View Post
take a really REALLY fine grit sandpaper to em. because like what dan az said, the "Warping" is usually a buildup of brake crap.

You got to be careful what type of sandpaper you use. Garnet only like dan az said.

Quote:
The obvious question now is "is there a "cure" for discs with uneven friction material deposits?" The answer is a conditional yes. If the vibration has just started, the chances are that the temperature has never reached the point where cementite begins to form. In this case, simply fitting a set of good "semi-metallic" pads and using them hard (after bedding) may well remove the deposits and restore the system to normal operation but with upgraded pads. If only a small amount of material has been transferred i.e. if the vibration is just starting, vigorous scrubbing with garnet paper may remove the deposit. As many deposits are not visible, scrub the entire friction surfaces thoroughly. Do not use regular sand paper or emery cloth as the aluminum oxide abrasive material will permeate the cast iron surface and make the condition worse. Do not bead blast or sand blast the discs for the same reason.
Great article: http://www.stoptech.com/tech_info/wp...rakedisk.shtml
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Old 06-21-2010, 10:16 PM   #11
Evil Imports
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PM thegreg the shop he works for in Tempe will turn slotted rotors
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Old 06-22-2010, 12:29 AM   #12
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Originally Posted by Evil Imports View Post
PM thegreg the shop he works for in Tempe will turn slotted rotors
Not sure why people think warping is build of of brake material. I have been taught, and seen (in my limited years) that pulsation/warping is due to the rotor getting too hot.

At our shop we machine rotors every time we do a brake job, if the rotor has a smooth surface. Bottom line is the pad is rough new, and so is the rotor, why wouldn't you want to create the same starting environment as when the parts were brand new? A rough pad and smooth rotor will more then likely cause brake noise, and glaze the pad prematurely.

You wouldn't put a clutch in with out machining the flywheel would you?

And yes we can machine slotted/drilled/JDM/chocolate rotors at the shop I work for.

Arizona Auto Care
5245 S Kyrene #104
Tempe, AZ 85283

If they have rotor hats, please remember to bring those with you.
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Old 06-22-2010, 03:44 AM   #13
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Quote:
Originally Posted by thegreg View Post
Not sure why people think warping is build of of brake material. I have been taught, and seen (in my limited years) that pulsation/warping is due to the rotor getting too hot.

Because most of the time it's not actual warping, it's just a buildup of brake crap on the rotor from the pads heating up, then cooling down and leaving residue. I've had warped rotors and rotors with brake buildup, and I honestly couldn't tell the difference until after I had sanded off the brake crap.


and kpluiten thanks for correcting me. yes only use garnet. I couldn't remember if I had used another kind for some reason.
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Old 06-22-2010, 04:11 AM   #14
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Quote:
Originally Posted by thegreg View Post
Not sure why people think warping is build of of brake material. I have been taught, and seen (in my limited years) that pulsation/warping is due to the rotor getting too hot.

At our shop we machine rotors every time we do a brake job, if the rotor has a smooth surface. Bottom line is the pad is rough new, and so is the rotor, why wouldn't you want to create the same starting environment as when the parts were brand new? A rough pad and smooth rotor will more then likely cause brake noise, and glaze the pad prematurely.

You wouldn't put a clutch in with out machining the flywheel would you?

And yes we can machine slotted/drilled/JDM/chocolate rotors at the shop I work for.

Arizona Auto Care
5245 S Kyrene #104
Tempe, AZ 85283

If they have rotor hats, please remember to bring those with you.


+1. couldnt have said it better myself.




If your brake pedal steering is pulsating when you apply brakes you have warped rotors. If not, And dont really care just do a pad slap. But its better to have them turned.
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Old 06-22-2010, 07:11 AM   #15
kpluiten
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Quote:
Originally Posted by thegreg View Post
Not sure why people think warping is build of of brake material. I have been taught, and seen (in my limited years) that pulsation/warping is due to the rotor getting too hot.

At our shop we machine rotors every time we do a brake job, if the rotor has a smooth surface. Bottom line is the pad is rough new, and so is the rotor, why wouldn't you want to create the same starting environment as when the parts were brand new? A rough pad and smooth rotor will more then likely cause brake noise, and glaze the pad prematurely.

You wouldn't put a clutch in with out machining the flywheel would you?

And yes we can machine slotted/drilled/JDM/chocolate rotors at the shop I work for.

Arizona Auto Care
5245 S Kyrene #104
Tempe, AZ 85283

If they have rotor hats, please remember to bring those with you.
I'd read this. I think this guy knows his stuff:

http://www.stoptech.com/whitepapers/...otors_myth.htm

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Old 06-22-2010, 07:12 AM   #16
kpluiten
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Quote:
Originally Posted by Momosaurus WRX View Post
Because most of the time it's not actual warping, it's just a buildup of brake crap on the rotor from the pads heating up, then cooling down and leaving residue. I've had warped rotors and rotors with brake buildup, and I honestly couldn't tell the difference until after I had sanded off the brake crap.


and kpluiten thanks for correcting me. yes only use garnet. I couldn't remember if I had used another kind for some reason.

^ This guy knows the truth.
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Old 06-22-2010, 12:12 PM   #17
thegreg
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Originally Posted by kpluiten View Post
I'd read this. I think this guy knows his stuff:

http://www.stoptech.com/whitepapers/...otors_myth.htm

I don't want to start a battle on this guys thread, but if I or anyone can learn something from this, it won't be for nothing.
I read that article, and looked at the photos, the dark spots "brake pad deposit" looked just like "hot spots". Which often times can go completely thru the rotor. It doesn't make sense (unless stritcly race application) that the pad material would leave anything on the rotor. The rotor is more dense/hard then the pads. That's why the pad wears down before the rotor does. I could be wrong when it comes to race application, THAT I dont have experience in. If the rotor didn't need to be machined, why, when it comes new does it have a non-directional machine to the surface? Why not leave it smooth as I am assuming it comes out of the lathe?

Just my extra 2cents. Now I have none left.
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Old 06-22-2010, 12:23 PM   #18
AWDshenanigans
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how much do you want to turn chocolate rotors?
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Old 06-22-2010, 12:33 PM   #19
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Quote:
Originally Posted by thegreg View Post
I don't want to start a battle on this guys thread, but if I or anyone can learn something from this, it won't be for nothing.
I read that article, and looked at the photos, the dark spots "brake pad deposit" looked just like "hot spots". Which often times can go completely thru the rotor. It doesn't make sense (unless stritcly race application) that the pad material would leave anything on the rotor. The rotor is more dense/hard then the pads.
No battle here, just a discussion. As far as the rotor being more dense/hard than the pad, this is true. Obviously. But metal isn't always solid. At a microscopic level, it is actually very rough with lots of pits and whatnot. It's entirely possible for material from the pads to get caught up on these features and remain there. As silly as it sounds, think of it as this: The rotor is steel wool and the pad is jello. Rub the wool on the jello enough and the jello will wear away... because the wool is harder than the jello, just like a pad and rotor. But in the process, jello will get caught up in the pores of the wool, leaving deposits. Just because you can't see this material on the rotor with the naked eye, doesn't mean it's not there.

All I'm saying is that is the explainantion (that I linked to) from a brake system engineer with decades of experience. I bet he's see a few things and done more than a few tests.
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Old 06-22-2010, 12:40 PM   #20
dan az
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its not technically the pad material itself that is being deposited on the rotor, its partially the crap that hold the pad together, ive been able to cure every "warped rotor" pulsation ive ever had on the wrx with garnet paper. (i have big brembos with slotted rotors) if it doesnt work just turn them but evertime you turn rotors your taking away rotor material.
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Old 06-22-2010, 12:43 PM   #21
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True, it's the binder or resin I guess. It can overheat and i assume become sticky. This coupled with the pressure exerted by the caliper embeds it.
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Old 06-22-2010, 06:46 PM   #22
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how much do you want to turn chocolate rotors?
fREE 99!

I have been honestly educated.
Jello example makes great sense.
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Old 06-22-2010, 09:14 PM   #23
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fREE 99!

I have been honestly educated.
Jello example makes great sense.
Dripping with sarcasm, huh?
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Old 06-22-2010, 09:33 PM   #24
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Dripping with sarcasm, huh?
Honestly none at all.
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