Interesting study

Stereo5, it was not warped rotors it was bad metal. GM used crappy metal for their rotors for years. When your rotors and pads get wet during a rain or snow event water stays under the pads when you stop and corrodes the metal under the pad. With good metal the corrosion does not go that deep and the disc gets cleaned off after a few stops but with the garbage GM was using the rotors would start pulsing as if they were warped but even good rotors will to this if the car is left outside, inactive for long periods at a time or washed frequently, immediately put away and left inactive. I has a GM pick up truck back in 2001 and the rotors were trash after only 10,000 miles I asked the tech how this could be and his response was that "they all do this." I have forever sworn off GM products. They should have been allowed to go bankrupt. 

Must have been 2001 we had a 2002,2003 and 2004 Chevy pickups at work and none of them had brake problems. 

@mijostyn  Yes, of course, you are right:  there are those truck drivers.....  Some of them just do seem to be offended that you are even there.  You sure have to be a defensive rider!

mijostyn

I have forever sworn off GM products. They should have been allowed to go bankrupt

GM did go bankrupt.

As with Mijostyn I also will never buy a GM product.  My caddy had two different metals for the cylinders and heads and due to the different expansion and contraction rates were known to blow head gaskets.  Also known by GM and anyone who worked on them is that the cylinder head bolts required such high torqueing that they virtually always stripped the threads when attempting to install the heads.