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Warped Rotor poll
#11
08-03-2005, 09:07 PM
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#12
08-04-2005, 01:28 AM
RE: Warped Rotor poll
The issue is not just simply pads, rotors, and combinations thereof. Break-in procedures make a difference, as well. Hi-po sports car Owner's Manuals often talk about this (hell, even trailer Manuals do), but few mainstream vehicles seem to. Obviously, most do okay with no systematic break-in.
But, prematurely overheating the brakes can ruin rotors by transferring pad material to the rotor, which heats unevenly, making matters worse, then transferring more pad, etc. Finally, the rotor material in the hot-spots gets preternaturally hard and causes "pulsating," often confused with warping.
If you get aftermarket brakes, attend quite carefully to the recommended break-in procedures. They should provide them. If not, ask!
Good luck.
But, prematurely overheating the brakes can ruin rotors by transferring pad material to the rotor, which heats unevenly, making matters worse, then transferring more pad, etc. Finally, the rotor material in the hot-spots gets preternaturally hard and causes "pulsating," often confused with warping.
If you get aftermarket brakes, attend quite carefully to the recommended break-in procedures. They should provide them. If not, ask!
Good luck.
#13
08-04-2005, 06:34 PM
#14
08-05-2005, 01:30 AM
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RE: Warped Rotor poll
42500 miles
No issues at all, even after completely submerging the wheels on MANY occasions(puddles, streams, rivers, lakes).
Are the rotors different on a 4X4 vs a 2wd? Or a 4X4 with the offroad package vs a regular 4X4?
This is an interesting read about warped rotors. It reaffirms what Avanti stated earlier and what i have been told by crusty car guys.
The link to the entire article is at the bottom.
Myth # 1 – BRAKE JUDDER AND VIBRATION IS CAUSED BY DISCS THAT HAVE BEEN WARPED FROM EXESSIVE HEAT.
The term "warped brake disc" has been in common use in motor racing for decades. When a driver reports a vibration under hard braking, inexperienced crews, after checking for (and not finding) cracks often attribute the vibration to "warped discs". They then measure the disc thickness in various places, find significant variation and the diagnosis is cast in stone.
When disc brakes for high performance cars arrived on the scene we began to hear of "warped brake discs" on road going cars, with the same analyses and diagnoses. Typically, the discs are resurfaced to cure the problem and, equally typically, after a relatively short time the roughness or vibration comes back. Brake roughness has caused a significant number of cars to be bought back by their manufacturers under the "lemon laws". This has been going on for decades now - and, like most things that we have cast in stone, the diagnoses are wrong.
With one qualifier, presuming that the hub and wheel flange are flat and in good condition and that the wheel bolts or hat mounting hardware is in good condition, installed correctly and tightened uniformly and in the correct order to the recommended torque specification, in more than 40 years of professional racing, including the Shelby/Ford GT 40s – one of the most intense brake development program in history
- I have never seen a warped brake disc. I have seen lots of cracked discs, (FIGURE 1) discs that had turned into shallow cones at operating temperature because they were mounted rigidly to their attachment bells or top hats, (FIGURE 2) a few where the friction surface had collapsed in the area between straight radial interior vanes, (FIGURE 3) and an untold number of discs with pad material unevenly deposited on the friction surfaces - sometimes visible and more often not. (FIGURE 4)
In fact every case of "warped brake disc" that I have investigated, whether on a racing car or a street car, has turned out to be friction pad material transferred unevenly to the surface of the disc. This uneven deposition results in thickness variation (TV) or run-out due to hot spotting that occurred at elevated temperatures.
In order to understand what is happening here, we will briefly investigate the nature of the stopping power of the disc brake system.
http://www.stoptech.com/whitepapers/...otors_myth.htm
No issues at all, even after completely submerging the wheels on MANY occasions(puddles, streams, rivers, lakes).
Are the rotors different on a 4X4 vs a 2wd? Or a 4X4 with the offroad package vs a regular 4X4?
This is an interesting read about warped rotors. It reaffirms what Avanti stated earlier and what i have been told by crusty car guys.
The link to the entire article is at the bottom.
Myth # 1 – BRAKE JUDDER AND VIBRATION IS CAUSED BY DISCS THAT HAVE BEEN WARPED FROM EXESSIVE HEAT.
The term "warped brake disc" has been in common use in motor racing for decades. When a driver reports a vibration under hard braking, inexperienced crews, after checking for (and not finding) cracks often attribute the vibration to "warped discs". They then measure the disc thickness in various places, find significant variation and the diagnosis is cast in stone.
When disc brakes for high performance cars arrived on the scene we began to hear of "warped brake discs" on road going cars, with the same analyses and diagnoses. Typically, the discs are resurfaced to cure the problem and, equally typically, after a relatively short time the roughness or vibration comes back. Brake roughness has caused a significant number of cars to be bought back by their manufacturers under the "lemon laws". This has been going on for decades now - and, like most things that we have cast in stone, the diagnoses are wrong.
With one qualifier, presuming that the hub and wheel flange are flat and in good condition and that the wheel bolts or hat mounting hardware is in good condition, installed correctly and tightened uniformly and in the correct order to the recommended torque specification, in more than 40 years of professional racing, including the Shelby/Ford GT 40s – one of the most intense brake development program in history
- I have never seen a warped brake disc. I have seen lots of cracked discs, (FIGURE 1) discs that had turned into shallow cones at operating temperature because they were mounted rigidly to their attachment bells or top hats, (FIGURE 2) a few where the friction surface had collapsed in the area between straight radial interior vanes, (FIGURE 3) and an untold number of discs with pad material unevenly deposited on the friction surfaces - sometimes visible and more often not. (FIGURE 4)
In fact every case of "warped brake disc" that I have investigated, whether on a racing car or a street car, has turned out to be friction pad material transferred unevenly to the surface of the disc. This uneven deposition results in thickness variation (TV) or run-out due to hot spotting that occurred at elevated temperatures.
In order to understand what is happening here, we will briefly investigate the nature of the stopping power of the disc brake system.
http://www.stoptech.com/whitepapers/...otors_myth.htm
#17
08-11-2005, 09:07 PM
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#18
08-13-2005, 03:59 PM
