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Warped rotor pics. #5111224 05/21/19 11:47 AM
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Chris142 Offline OP
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In the past people here have said that rotors don't "warp". That shaking or shuddering during braking is caused by brake pad deposits.

This is on my lathe right now. You can see the spots where the bit is not even touching the rotor. Definitely NOT pad deposits.

The bits are missing the rotor on opposite sides like you would think it would if a rotor was warped.

Thoughts?

IMG_20190521_094057.jpgIMG_20190521_094114.jpgIMG_20190521_094106.jpg

02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
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Re: Warped rotor pics. [Re: Chris142] #5111227 05/21/19 11:50 AM
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Trav Offline
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I have said the same thing many times, my brake lathe doesn't lie. It is not pad deposits its metal.
Edit: That bit of misinformation about pad deposits was written by some jamoke and its been touted as gospel ever since, its crap and anyone that has run a brake lathe knows it.

Last edited by Trav; 05/21/19 11:52 AM.

ASE L1, Master. Deutsch Meisterbrief.
Re: Warped rotor pics. [Re: Trav] #5111229 05/21/19 11:52 AM
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mightymousetech Offline
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Originally Posted by Trav
I have said the same thing many times, my brake lathe doesn't lie. It is not pad deposits its metal.


Agreed!


Mighty Mouse Tech
BMW Diagnostic and Alignment Tech
2013 BMW 135i M Sport Edition Motul 0W40, MTL/MT-LV
2010 BMW 328i X-Drive, Castrol 0W40, MT-LV
Re: Warped rotor pics. [Re: Chris142] #5111232 05/21/19 11:53 AM
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supton Offline
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How old are the rotors? Around here I'd guess around 6 months at most--but you're over there, so those could be six years. Curious if they were bad out of the box. They certainly don't look like they have any grooves on them, so they look lightly used.

Maybe they got dropped a few times?


2011 Toyota Camry, base, 2.5L/6MT, 187k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 153k, ours
1999 Toyota Camry LE, 2.2L/4AT, 209k, his
Re: Warped rotor pics. [Re: Chris142] #5111234 05/21/19 11:54 AM
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RamFan Offline
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This gun be good! popcorn2

Put me on team warp.


18 Giulia Ti Sport Q4
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Re: Warped rotor pics. [Re: Chris142] #5111235 05/21/19 11:56 AM
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mehullica Offline
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Do you crank down the parking brake, especially after a hot day? Lexus has this issue with the hat warping from too much parking brake pressure clamping down on the first gen GS300. They redesigned the rear rotors & we had to loosen the brake adjustment.

Re: Warped rotor pics. [Re: supton] #5111242 05/21/19 12:00 PM
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Chris142 Offline OP
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Originally Posted by supton
How old are the rotors? Around here I'd guess around 6 months at most--but you're over there, so those could be six years. Curious if they were bad out of the box. They certainly don't look like they have any grooves on them, so they look lightly used.

Maybe they got dropped a few times?

Originals on this 05 ram 1500.

Last edited by Chris142; 05/21/19 12:04 PM.

02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: Warped rotor pics. [Re: mehullica] #5111246 05/21/19 12:01 PM
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Chris142 Offline OP
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Originally Posted by mehullica
Do you crank down the parking brake, especially after a hot day? Lexus has this issue with the hat warping from too much parking brake pressure clamping down on the first gen GS300. They redesigned the rear rotors & we had to loosen the brake adjustment.

This is on the front brakes. No parking brakes on the front.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: Warped rotor pics. [Re: Chris142] #5111248 05/21/19 12:02 PM
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WyrTwister Offline
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I have heard the noise when the lathe hit hard spots on a drum or rotor .


Wyr
God bless
Re: Warped rotor pics. [Re: RamFan] #5111250 05/21/19 12:04 PM
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Langanobob Offline
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I don’t recall hearing that brake rotors don’t warp, obviously they do. What I have heard is that sometimes brake shuddering is due to deposits and not always due to warped rotors. I’ve stopped the shuddering by just cleaning up the rotors and pads numerous times.

Again, not saying that rotors don’t warp. They do.

Re: Warped rotor pics. [Re: Chris142] #5111255 05/21/19 12:10 PM
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rollinpete Offline
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Warped for sure.
They would give you that brake on and off effect when coming to a stop.


Pete.

97 Ford Expl.Sport 4.0 ohv 4wd 5spd 188k miles
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Currently under the influence of oil shocked2

Re: Warped rotor pics. [Re: Chris142] #5111263 05/21/19 12:23 PM
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Fitz98 Offline
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I had a problem for the longest time on my Expedition with front rotors warping. Replaced them with new ones with new pads as well, same problem after a short amount of driving. Ended up replacing the bearing hub to solve the problem (with new pads and rotors again). I had to use a micrometer to troubleshoot the hub being warped.
I theorize that with the warped bearing hub, that the rotors would heat up more on the high side and over time warp the new rotor.
I think the problem may have come from when I got the truck used from Connecticut and the front rotors needed replacing but were rusted on to the hubs. The dealer said they had to heat them up and beat them aggressively to get them off.

Re: Warped rotor pics. [Re: Chris142] #5111264 05/21/19 12:24 PM
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zorobabel Offline
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Originally Posted by Chris142
In the past people here have said that rotors don't "warp".
Thoughts?

Sensationalism started by the stoptech blog with the brake deposits.
I have warped rotors descending mountain passes twice. Another time, a malfunctioning MC managed to warp a rotor and it's replacement before I figured out the cause. Another time a friend warped his rotors descending a mountain pass - I was a passenger.


1997 Maxima 206k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 205k, VWB 5W-20-30, MGL4967
Re: Warped rotor pics. [Re: Chris142] #5111308 05/21/19 01:08 PM
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benjy Offline
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today most rotors are cast in China, even brand names + of course some better than others. i like the UK or USA made EBC rotors said to have higher carbon in them. OE can be crap as well especially newer stuff as quality seems to be getting less as technology progresses

Re: Warped rotor pics. [Re: Chris142] #5111326 05/21/19 01:21 PM
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lbhsbz Offline
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Have your lathe adapters been indexed to the brake lathe arbor and faced off to true up the assembly? If not, then you're probably doing more damage than good with that lathe.

Easy enough to check. After "fixing" that rotor on the lathe, measure runout after you install it back on the hub. Let us know what you find.

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