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Warped rotor pics. #5111224
05/21/19 11:47 AM
05/21/19 11:47 AM
Joined: Jun 2003
Posts: 19,013
Apple Valley, California
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 19,013
Apple Valley, California
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
57 case tractor Chevron sae30
Re: Warped rotor pics. [Re: Chris142] #5111227
05/21/19 11:50 AM
05/21/19 11:50 AM
Joined: Nov 2006
Posts: 21,958
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,958
MA, Mittelfranken.de
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
05/21/19 11:52 AM
Joined: Apr 2017
Posts: 1,548
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline

Joined: Apr 2017
Posts: 1,548
Ontario, Canada
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
2010 Civic Si Motul 0W40, Redline MTL
2013 BMW 135i M Sport Edition Motul 0W40, Redline MTL
Re: Warped rotor pics. [Re: Chris142] #5111232
05/21/19 11:53 AM
05/21/19 11:53 AM
Joined: Nov 2008
Posts: 13,782
NH
supton Offline
supton  Offline

Joined: Nov 2008
Posts: 13,782
NH
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, 185k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 150k, ours
1999 Toyota Camry LE, 2.2L/4AT, 208k, his
Re: Warped rotor pics. [Re: Chris142] #5111234
05/21/19 11:54 AM
05/21/19 11:54 AM
Joined: May 2010
Posts: 2,332
Illinois, U.S.A
RamFan Offline
RamFan  Offline

Joined: May 2010
Posts: 2,332
Illinois, U.S.A
This gun be good! popcorn2

Put me on team warp.


18 Giulia Ti Sport Q4
  • 2.0T I4 - 12k - PP Euro LX 0w30 - Mobil 1 - 10k/1yr

16.5 CX-5 Touring AWD
  • 2.5L I4 - 60k - Citgo Supergard Syn 5w30 - Denso - 7.5k/1yr
Re: Warped rotor pics. [Re: Chris142] #5111235
05/21/19 11:56 AM
05/21/19 11:56 AM
Joined: Aug 2009
Posts: 613
Modesto,CA
mehullica Offline
mehullica  Offline

Joined: Aug 2009
Posts: 613
Modesto,CA
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
05/21/19 12:00 PM
Joined: Jun 2003
Posts: 19,013
Apple Valley, California
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 19,013
Apple Valley, California
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
05/21/19 12:01 PM
Joined: Jun 2003
Posts: 19,013
Apple Valley, California
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 19,013
Apple Valley, California
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
05/21/19 12:02 PM
Joined: Jan 2013
Posts: 2,887
Texas
WyrTwister Offline
WyrTwister  Offline

Joined: Jan 2013
Posts: 2,887
Texas
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
05/21/19 12:04 PM
Joined: Apr 2009
Posts: 287
Reno, Nevada
Langanobob Offline
Langanobob  Offline

Joined: Apr 2009
Posts: 287
Reno, Nevada
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
05/21/19 12:10 PM
Joined: Mar 2017
Posts: 872
Western Ma.
rollinpete Offline
rollinpete  Offline

Joined: Mar 2017
Posts: 872
Western Ma.
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 187k miles
03 Saturn Ion 2.2 L4 5spd 238k miles
PP, PPHM 50/50 5w30

Currently under the influence of oil shocked2

Re: Warped rotor pics. [Re: Chris142] #5111263
05/21/19 12:23 PM
05/21/19 12:23 PM
Joined: Mar 2011
Posts: 433
Florida
Fitz98 Offline
Fitz98  Offline

Joined: Mar 2011
Posts: 433
Florida
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
05/21/19 12:24 PM
Joined: Jan 2011
Posts: 928
Anaheim, CA
zorobabel Offline
zorobabel  Offline

Joined: Jan 2011
Posts: 928
Anaheim, CA
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 201k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 200k, VWB + SSS + Rislone cocktail, MGL51516
Re: Warped rotor pics. [Re: Chris142] #5111308
05/21/19 01:08 PM
05/21/19 01:08 PM
Joined: Aug 2010
Posts: 1,669
pa
benjy Offline
benjy  Offline

Joined: Aug 2010
Posts: 1,669
pa
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
05/21/19 01:21 PM
Joined: Feb 2012
Posts: 38
Long Beach CA
lbhsbz Offline
lbhsbz  Offline

Joined: Feb 2012
Posts: 38
Long Beach CA
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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