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#4573492 - 11/14/17 07:29 AM Rotor warp: Solid vs. fluted?
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
Noting the other day, while having the front wheels off my '82 Mercedes for the first time, that it has solid rotors all the way around rather than the more common type with cooling fins between the two friction surfaces - will a solid rotor withstand more heat than a hollow one before becoming unusable? Now, you may say, the solid one won't cool as well so it'll get hotter in the first place; this may be true. But what of the initial question?
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#4573498 - 11/14/17 07:35 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Always fluted or the ones with the holes. I have had far too many solid ones suffer from heat warping.
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#4573503 - 11/14/17 07:40 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: Reunion Island
Fluted. The one with holes tend to crack in anything more than a little spirited driving.
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#4573509 - 11/14/17 07:47 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
Interesting. I would've thought the solid ones would be more rigid and move less under heat stresses. Wrong!
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#4573520 - 11/14/17 08:07 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
mcrn Online   content


Registered: 11/30/05
Posts: 3200
Loc: FL
I had factory Mercedes rotors on my 83 240D.....never had a warp problem.....but I used factory rotors. Things are tanks.
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#4573544 - 11/14/17 08:31 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
440Magnum Offline


Registered: 02/01/09
Posts: 8754
Loc: Texas
Vented. I'm surprised to see solid rotors on an MB, the last other vehicle I saw with solid rotors anywhere was a 79 Mazda. Vented rotors dissipate heat WAY faster (even faster than drilled/slotted solid rotors), and are actually more rigid because the internal vanes lock two external disks together, making a sort of trusswork that is extremely rigid.

FWIW, rotors don't warp, at least not unless you get them INSANELY hot. Like NASCAR at Bristol rotors-glowing-orange-in-the-corners hot.

Most "warped" rotors are perfectly flat, but have unevenly accumulated deposits from the pads outgassing- it usually starts with someone making an aggressive stop and then sitting at a light for a minute or two with the hot pads clamped hard against the hot rotors.

I've had cars that you'd swear the rotors looked like Ruffles potato chips the way the wheel shook when you touched the brakes. One scotch-brite wheel on a die grinder lightly applied to both sides of the rotor while turning the rotor by hand, and then rinsing with Brakeleen... cured. Years ago, I couldn't believe it when I first read that this was the usual cause of "warped" rotors, but after trying simple cleaning and de-glazing a dozen times over the years, I'm 100% convinced. Now, every time I change pads, I de-glaze and rinse the rotors and I've never had the problem since. I'm also a fan of EBC brake pads which come with an abrasive break-in coating that keeps the rotors from glazing as the new pads bed. And they'd probably break the glaze on old rotors without any manual labor, but I always do my manual de-glazing instead.
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#4573606 - 11/14/17 09:17 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
mcwilly Offline


Registered: 07/31/17
Posts: 98
Loc: Canada
I will have to try deglazing my rotors next time.

I've had serious vibration in the STI while braking. Replacing the rotors completely stopped any vibration.

I have done it twice now. Currently I have slotted and drilled rotors, so maybe there will be less build up on those.

Previously the OEM Subaru ones were smooth, and I replaced them with a set of smooth aftermarket ones.
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#4573608 - 11/14/17 09:20 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: Reunion Island
I swear I had many warped rotors. Sometimes quenched by a water pool, or simply heating too quick and hot.
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#4573634 - 11/14/17 09:53 AM Re: Rotor warp: Solid vs. fluted? [Re: 440Magnum]
wheelman1991 Offline


Registered: 06/22/16
Posts: 92
Loc: Watertown, NY USA
Originally Posted By: 440Magnum


FWIW, rotors don't warp, at least not unless you get them INSANELY hot. Like NASCAR at Bristol rotors-glowing-orange-in-the-corners hot.

Most "warped" rotors are perfectly flat

Around 95% of the cars and trucks that come into the shop I work at, when they have a pulsating brake pedal, at least one of the rotors are in fact warped. I can't even begin to count how many times I have placed a suspect rotor on a flat metal surface, and was able to rock it back and forth. I live in northern New York State, and it seems like in the winter the salt used on the roads, plus the extreme difference in temperature the brakes see really tears them up.


Edited by wheelman1991 (11/14/17 09:57 AM)
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#4573691 - 11/14/17 11:00 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: Reunion Island
Every small/compact car I had (with small diameter and width wheels) have seen some warped rotor at some point in life. On the other side, the wide wheels car I had, or the wifeís SUV, havenít seen any warped rotors yet. Maybe something to do with discs diameter (dissipation area) or the protection from eater splashes?
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#4573696 - 11/14/17 11:03 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: Reunion Island
I even had warped rotors on motorcycles. Sometimes heat/cooling factor, sometimes forgot to remove antitheft disc lock device crazy

Then comes overtorquing wheel nuts... seen it on bitog
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#4573697 - 11/14/17 11:04 AM Re: Rotor warp: Solid vs. fluted? [Re: wheelman1991]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Originally Posted By: wheelman1991
Originally Posted By: 440Magnum


FWIW, rotors don't warp, at least not unless you get them INSANELY hot. Like NASCAR at Bristol rotors-glowing-orange-in-the-corners hot.

Most "warped" rotors are perfectly flat

Around 95% of the cars and trucks that come into the shop I work at, when they have a pulsating brake pedal, at least one of the rotors are in fact warped. I can't even begin to count how many times I have placed a suspect rotor on a flat metal surface, and was able to rock it back and forth. I live in northern New York State, and it seems like in the winter the salt used on the roads, plus the extreme difference in temperature the brakes see really tears them up.


I currently have this going on in the Journey. This will be it's 3rd winter and while the pads still have 40% life left the rotors pulsate like crazy when braking moderately. I'm just putting up with it until the pads are done and then I will replace it all and most definitely after the winter.
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#4573710 - 11/14/17 11:24 AM Re: Rotor warp: Solid vs. fluted? [Re: StevieC]
440Magnum Offline


Registered: 02/01/09
Posts: 8754
Loc: Texas
Originally Posted By: StevieC
Originally Posted By: wheelman1991
Originally Posted By: 440Magnum


FWIW, rotors don't warp, at least not unless you get them INSANELY hot. Like NASCAR at Bristol rotors-glowing-orange-in-the-corners hot.

Most "warped" rotors are perfectly flat

Around 95% of the cars and trucks that come into the shop I work at, when they have a pulsating brake pedal, at least one of the rotors are in fact warped. I can't even begin to count how many times I have placed a suspect rotor on a flat metal surface, and was able to rock it back and forth. I live in northern New York State, and it seems like in the winter the salt used on the roads, plus the extreme difference in temperature the brakes see really tears them up.


I currently have this going on in the Journey. This will be it's 3rd winter and while the pads still have 40% life left the rotors pulsate like crazy when braking moderately. I'm just putting up with it until the pads are done and then I will replace it all and most definitely after the winter.


I'm telling you, just try de-glazing. You will be astounded. The whole crux of the matter is that a little warpage WON'T make the pedal pulse or the wheel wobble unless a caliper is also seized. Deposit buildup will. The calipers float with a small amount of warpage. Uniform thickness is mandatory, but rotors don't have to be (and won't stay) absolutely perfectly flat.
_________________________
'66 Dodge Polara & '69 Dodge Coronet R/T both 440/727
'08 Ram 1500 4.7/545RFE
'12 Challenger SRT8 392/6-speed
'99 XJ 4x4 4.0/AX15, '14 WK2 4x4 3.6/8HP

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#4573712 - 11/14/17 11:27 AM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
I can't be bothered taking them a part to do this, I will ride them like this and then just replace them. If it happened with almost new pads then I would for sure but these are almost used up anyway.
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#4573824 - 11/14/17 01:51 PM Re: Rotor warp: Solid vs. fluted? [Re: Alex_V]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
My observations lead me to believe both are possile. Warpage with consistent thickness shouldn't cause pulsing because the caliper can float. But, if heat is so rarely what kills a rotor, why does turning a shaky rotor (removing those deposits of foreign material) so seldom produce a lasting fix?


Edited by Alex_V (11/14/17 01:53 PM)
_________________________
I like Chevy and Valvoline.

'13 Cruze, 1.4T, 112K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 167K
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