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Re: Warped rotor pics. [Re: Chris142] #5111802
05/21/19 09:28 PM
05/21/19 09:28 PM
Joined: Aug 2018
Posts: 156
Central US
bobdoo Offline
bobdoo  Offline

Joined: Aug 2018
Posts: 156
Central US
The warped rotors on my Impreza magically disappeared after I re-bedded them. Guess subaru has built-in lathes...

Re: Warped rotor pics. [Re: HangFire] #5111834
05/21/19 09:56 PM
05/21/19 09:56 PM
Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
Originally Posted by HangFire
I had bad shudder on my Toyota Camry, runout on left front rotor was .001", not +/- .001", just .001", but the glazed half versus non-glazed half was obvious.

The jamoke that wrote the Stoptech article was also the brake consultant on the Ford GT program.

Yes warped rotors really happen. Stuck caliper overheating, as mentioned. Or, put a flat rotor on a car crooked, run it until it shudders, then put it correctly on a brake lathe and you'll cut lots of metal.

But every case of "warped" I've run into has been either a bad install or uneven glazing. I've also never successfully gotten a runout reading from a service writer. Maybe I'm just a jamoke, too. But I know how to use my Starrett indicator.


While deposits can certainly cause pulsation the statement "rotors do not warp" is an incorrect statement regardless of who wrote it and what program they have or claimed to have been involved in.
I know how to use all my measuring tools inc the dial indicator, so what does that get me a gold star? LOL


ASE L1, Master. Deutsch Meisterbrief.
Re: Warped rotor pics. [Re: Chris142] #5111928
05/22/19 02:40 AM
05/22/19 02:40 AM
Joined: Jul 2003
Posts: 5,197
New Zealand
Silk Offline
Silk  Offline

Joined: Jul 2003
Posts: 5,197
New Zealand
Desktop engineers.


1987 BMW R65 - Aegis SAE30
2005 Nissan Expert - 5W-40 Castrol Magnatec diesel.
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Warped rotor pics. [Re: bobdoo] #5112340
05/22/19 12:03 PM
05/22/19 12:03 PM
Joined: Jun 2003
Posts: 18,990
Apple Valley, California
Chris142 Offline OP
Chris142  Offline OP

Joined: Jun 2003
Posts: 18,990
Apple Valley, California
Originally Posted by bobdoo
The warped rotors on my Impreza magically disappeared after I re-bedded them. Guess subaru has built-in lathes...

You did have pad deposits.


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: zorobabel] #5112406
05/22/19 01:29 PM
05/22/19 01:29 PM
Joined: Jan 2004
Posts: 5,263
California
nthach Offline
nthach  Offline

Joined: Jan 2004
Posts: 5,263
California
Originally Posted by zorobabel
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.

Brake deposits can happen with modern NAO "ceramic" pads with cohesive friction that the Japanese(Akebono/Advics/Nisshinbo[NBK]), it's been reported with Akebono ProACTs.

I'm a believer in warped metal, most rotors are coming from China these days. Cast iron is brittle and some rotors don't need much to get bent out of shape.

Re: Warped rotor pics. [Re: Chris142] #5112476
05/22/19 02:50 PM
05/22/19 02:50 PM
Joined: Apr 2006
Posts: 298
Alabama
ron350 Offline
ron350  Offline

Joined: Apr 2006
Posts: 298
Alabama
This debate about whether rotors warp or not is funny.

Turn about 100 rotors on any brake lathe you want and see what you think.


ron350
Re: Warped rotor pics. [Re: Chris142] #5112765
05/22/19 07:26 PM
05/22/19 07:26 PM
Joined: Aug 2013
Posts: 3,389
Central Maryland
HangFire Offline
HangFire  Offline

Joined: Aug 2013
Posts: 3,389
Central Maryland
I don't see any debate here , about the rotors anyway. People quoting the real racing brake expert engineer's paper and trying to make it say something it doesn't, then others using that as a straw man, I do see.

Re-read the stoptech article carefully and see if there's really anything to disagree with.

I'll tell you something that's no myth, service writers blaming owners for warping rotors, while having no runout measurements to base it on. Caught in the act, several times, by me. Proven wrong, with my instruments. So yeah I get a gold star, not a participation trophy.


Various musings: http://hangfire.net
Re: Warped rotor pics. [Re: Chris142] #5112870
05/22/19 09:00 PM
05/22/19 09:00 PM
Joined: Aug 2018
Posts: 156
Central US
bobdoo Offline
bobdoo  Offline

Joined: Aug 2018
Posts: 156
Central US
Originally Posted by Chris142
Originally Posted by bobdoo
The warped rotors on my Impreza magically disappeared after I re-bedded them. Guess subaru has built-in lathes...

You did have pad deposits.


That was the point of my post... Is this when I'm supposed to do the /s thing?

Re: Warped rotor pics. [Re: bobdoo] #5112882
05/22/19 09:24 PM
05/22/19 09:24 PM
Joined: Aug 2011
Posts: 636
GoVols
kstanf150 Offline
kstanf150  Offline

Joined: Aug 2011
Posts: 636
GoVols
With so many aftermarket choices now days
And the cost of turning old rotors
It’s not worth the hassle
I buy quality rotors and pads and replace and throw the old junk away

Re: Warped rotor pics. [Re: HangFire] #5113159
05/23/19 07:24 AM
05/23/19 07:24 AM
Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
Originally Posted by HangFire
I don't see any debate here , about the rotors anyway. People quoting the real racing brake expert engineer's paper and trying to make it say something it doesn't, then others using that as a straw man, I do see.

Re-read the stoptech article carefully and see if there's really anything to disagree with.

I'll tell you something that's no myth, service writers blaming owners for warping rotors, while having no runout measurements to base it on. Caught in the act, several times, by me. Proven wrong, with my instruments. So yeah I get a gold star, not a participation trophy.


You don't see any debate because you don't have the experience other than what you read on the net. I started in the trade when most cars with disc brakes had no hub mounted rotors they were spindle mounted and included the front wheel bearings in the rotor itself.
You packed the bearings, adjusted the bearings and checked the run out, if it was good you mounted the calipers and pads which were mostly semi metallic. if not you trued them on a brake lathe as it is not possible to shim or index them.

Whenever we got a car with pulsating brakes the rotors were distorted, it could be the pads wore the softer areas of the rotor quicker and cause it but in any case they were no longer true. So I suppose if someone is a armchair engineer you could say distortion is not the same as warping but the end effect is the same.
Floating steel rotors common on motorcycles and carbon racing rotors do not react the same way and rarely have pulsation issues, it appears to be a cast iron issue and high carbon content iron seems to be more resistant to it.


ASE L1, Master. Deutsch Meisterbrief.
Re: Warped rotor pics. [Re: Trav] #5113802
05/23/19 06:15 PM
05/23/19 06:15 PM
Joined: Aug 2013
Posts: 3,389
Central Maryland
HangFire Offline
HangFire  Offline

Joined: Aug 2013
Posts: 3,389
Central Maryland
Originally Posted by Trav
Originally Posted by HangFire
I don't see any debate here , about the rotors anyway. People quoting the real racing brake expert engineer's paper and trying to make it say something it doesn't, then others using that as a straw man, I do see.

Re-read the stoptech article carefully and see if there's really anything to disagree with.

I'll tell you something that's no myth, service writers blaming owners for warping rotors, while having no runout measurements to base it on. Caught in the act, several times, by me. Proven wrong, with my instruments. So yeah I get a gold star, not a participation trophy.


You don't see any debate because you don't have the experience other than what you read on the net.


I don't see any debate IN THIS THREAD... as for the rest, I'll just ignore your crass and ignorant insult.

For those who are interested in what the real expert said, stoptech.com took down the article, but here's a copy of it.

http://ipgparts.com/blog/stoptech-puts-to-rest-many-brake-myths/

And with that, I'm out.


Various musings: http://hangfire.net
Re: Warped rotor pics. [Re: HangFire] #5113978
05/23/19 08:50 PM
05/23/19 08:50 PM
Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
Wonder why they took the article down. No crass insult, you don't seem to have have any experience using a brake lathe.


ASE L1, Master. Deutsch Meisterbrief.
Re: Warped rotor pics. [Re: Chris142] #5114136
05/24/19 01:14 AM
05/24/19 01:14 AM
Joined: May 2012
Posts: 6,609
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline

Joined: May 2012
Posts: 6,609
Fort Lauderdale, FL
Never had a warped rotor in my life. Had trailer brakes give out during a hard stop on a 12 ton load. Still didn't warp rotors.

Had to drive 7 miles with my brakes self-applying on the same rotors due to a bad hydraulic booster. Still didn't warp them.

Brake lathe does not lie, but origins are still questionable.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Warped rotor pics. [Re: DoubleWasp] #5114173
05/24/19 04:16 AM
05/24/19 04:16 AM
Joined: Dec 2009
Posts: 27,660
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline

Joined: Dec 2009
Posts: 27,660
Regina, Saskatchewan, Canada
I would suggest it's possible that you might have had discs that handled such abuse a little better or had a more foolproof geometry. You can well imagine how taxis get driven, and I've never seen warped discs (or pad deposits or whatever we want to call it) on the old Caprice or Crown Vic platforms. Other vehicles haven't been so fortunate.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Warped rotor pics. [Re: Chris142] #5114493
05/24/19 11:38 AM
05/24/19 11:38 AM
Joined: May 2012
Posts: 6,609
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline

Joined: May 2012
Posts: 6,609
Fort Lauderdale, FL
I hear you. It's a valid point.

But my position is that I've owned multiple types and brands of vehicles over the years. I've used everything from eBay brake rotors, to Brembos, to OEM, to exotic racing brands, etc.

I've beaten the daylights out of almost all of them.

I've left a set of rotors with hairline cracks working their way through the entire face. I've left rotors with bluing through the hat. I buy new rotors because the old ones are no longer capable of being saved. Either below minimum thickness or in no shape to be reused. They do all last me a really long time, however.

But I have absolutely never had warped rotors. Ever. But somehow people are warping their rotors while going to out to run errands and get groceries? It's just really hard for me grasp.

It's easy to put a rotor in a lathe and see what it looks like now. Not so easy to see what it was like in the beginning. I really get the feeling a lot of rotor warpage occurs on the manufacturing level.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
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