Quoted:
Quoted: This is from my previous post. READ
THE REST OF THE ARTICLE :here
ETA: Carroll Smith Bio and website: here
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After reading that article several times, I faile to see the point the author is making.
According to the article, if "Warping" in automobile brake is acknowledged as uneven surface due to abnormal wear and improper bedding. Then, the the inherit behavior of disc brake compound to "Deposit" and cause "Cementite" which leads to an uneven surface and can be corrected with Blanchard ground(Which is a surfacing truing process similar to how flywheels are machined). No matter how you can use science and theoretical methods to explain the process, the Uneven Surface is still really laymen's term for "warping".
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Uneven surface means smooth, rough, smooth, rough, smooth, rough....and uneven surface TEXTURE would have been better terminology.
Carbides are a type of Cementite, like tungsten Carbide and if you have a very hard surface adjacent to a softer surface on a brake rotor (cast iron with patches of cementite) the surface has become UNEVEN
Just like the finish on a gun barrel can be UNEVEN, it does not mean the gun barrel is warped.
ETA: this is one of the photos showing an uneven surface.:
What the author is pointing out is that the "shaking" feeling is actually the pads slipping and then gripping very rapidly as they slide past softer, undamaged parts of the rotor and then slip on the harder, less grippy parts of the rotor.
Say you did this, on a bicycle, inlay some 120 grit sandpaper on the rim where the brake pad grips.... take the bike up to speed and hit the brake.... the bike will slow better on one part of the rim then the other. Now do this with a vehicle that has two front wheels, one wheel is going to slow more rapidly then the other, and then it will slow at the same speed and the other wheel will do the same. All of this will happen VERY fast as they are rotating... YOu now have your wheels shaking like something is warped.