https://www.brakes-shop.com/brakeped...braking-system i have been saying this for years after reading this gents post of it , an excuse use many times by a bad mechanic who only wants to take your money

 

I SAW warped disks/rotors with my own eyeballs. No matter any references you post, no matter how many testimonies you reference, no matter how many experts you cite......
I saw warped rotors with my own eyeballs. I took these warped rotors off a Dodge Caravan. No, it had not been tracked. It was driven by a single mother (who I later married).

 

The ONLY way a brake rotor can warp is if it heats up enough to soften the metal alloy. Different metals have different melting points. Carbon/iron alloy's is in excess of 1500 degrees, daily driving brings rotors to 300-400 degrees at the most and rotor track temps are usually around 500-1000 degrees depending on the track. Keep in mind street pads are designed for street temps no higher than 500-600 degrees before they will fail which is far below any possibility of heating rotors to melting temps.

I reckon some thin, defective or inferior alloys brought to their melting point from excessive speeds and excessive continuous braking, perhaps coming down a mountain highway.

I believe the point is however that many "warp" diagnosis is in fact glazing or pad material melted to the rotor surface. OR the rotor was not seated to the hub correctly and wore unevenly. Research lateral runout.

 

calm down please CJ . the internet disagrees with you i am afraid please google up warped discs . loads of other car forums also disagree with you . but YOU are entitled to your opinion .

 

correct sir . discs are made of cast iron it would take some heat to affect them

 

I don’t think the internet’s necessarily a reliable source, however science and metallurgy are….

 

"Opinion" my ***-hole. My eyes are not an opinion. Look at that other thread.... Warped does not have to mean Warped By Heat Exclusively. Warped means the end product from an outside source that caused deformation.
Sheesh. If the internet told you 0100110 = 38, you'd probably believe it. If nine people out of ten said 19x7=199, that does not make it true.

 

Could what you saw with your eyes in fact be uneven wear due to improper fitting?

 

........... which would do what, exactly............. deform a rotor into a non-intended and non-desired state of being (wait for it) ............. warped???
Semantics.
All semantics.
Warped is a condition, not a verb.

 

Sorry guys the internet is always right. Al Gore told us that when he invented it.

 

i missed an eventful day.
anyhow the rotors on the LR were worn (yes, their thickness severely reduced) and severely corroded. We placed then on the stainless steel table and without a doubt, the table was warped and not the disks…. BAHAHAHAHAHA

As the table was so warped, I put new disks all around. First time done on this vehicle in 110000 kms.

 

It’s not semantics at all, improper fitting will cause uneven wear and vibration not warping. But in all fairness I don’t recall you actually providing a description of what made you think they were “warped”. Again this is science not speculation.

 

So I guess Miriam Webster isn't correct either:


All these poor items and people were warped due to extreme heat and pressure. My sense of humor (except in this *expletive* thread) is quite warped. Oh, wait, THAT can't be right! It is scientifically proven that I can't be warped by "DUDE ON THE INTERNET".
Sheesh.
Please delete this entire debacle of a thread.

 

Mirriam-webster dictionary

Definition of warped

1: twisted out of a natural or normal shape

 

You beat me to it Ceejay

 

Or is this a theme derived by the second definition of ‘warped’ as presented by Oxford??

 

Of course, rather than saying "warped" the so-called "bad mechanic" could tell his customer that the discs are suffering from transfer thickness variation, or pad induced distortion, or that the friction area of the discs has collapsed....as per the article you linked. I am sure that some customers.... a phenomenally miniscule percentage.... will greatly appreciate the distinctions.

The article doesn't suggest that there are any no-cost solutions. The technical correctness/incorrectness of terminology used does not change the fact that, if the customer wants the condition repaired, somebody is gonna be "taking" his money.

Cheers
DD

 

It's time to stop and to move on. You can believe whatever you want.

I agree with jahummer. OEM quality cast iron rotors usually don't warp; there are other causes for steering wheel vibration when braking. See my Post #5 and the links to the old threads therein.
https://www.jaguarforums.com/forum/x...r-5-0l-246827/

The metallurgy of cast iron rotors varies, and aftermaket rotors can overheat and warp, particularly if they're cheap. You simply can't tell just by looking.
https://www.knowyourparts.com/techni...-damage-noise/

This thread is warped!

 

I've been told more than once by a Jaguar main dealer that my discs / rotors were 'warped' and needed changing urgently. That was in the days I was stupid enough to use Jaguar main dealerships. I ignored their 'advice' and guess what? Nothing. No ongoing issues at all. I suspect the dealerships were told to scare customers into parting with their money, and not many things will scare a customer like being told his brakes are 'faulty'.

To physically change the shape of a (properly installed) disc, it has to get very, very, very hot. Nothing else will change its shape. And my brakes can't get that hot, ever. I kept telling the Jaguar main dealers this, but they kept on plugging away.

 

It's all good...there are still some people who believe the earth is flat.....