Well, I have no degrees in any field but I do know that uneven torque on the lug nuts where some are TOO tight and some are TOO loose will cause the rotors to warp. It is not immigrant but takes 3 or 4 weeks of normal driving to happen. A trip to the mountains and getting the rotors extremal hot will cause it to happen sooner. We replaced the pads and turned the rotors for a gentleman and all was good. He later had a new set of tires installed at a tire shop. About a month latter, he came back to us with a pulsating brake peddle. We took care of the problem. About 2 months later he returned with the pulsations again. Again we took care of the problem. Another 2 months later, same problem. This time we ask a few questions. Have you had your tires rotated or anything? Well, he got a lifetime rotation with the new tires. We ask that the next time he had his tires rotated if he would come by ASAP and let us torque the lug nuts correctly. He did, and had no problems for the next 6 months. We lost so much money so we could keep a customer. He then believed what we were saying about the torque being very important that he took all the receipts we have given him (we make a receipt for our files and for the customers files even if it was free) to the tire place and demanded that they pay us a fair amount for all the work we had done that they had caused. Believe it or not, they paid us the labor for 5 brake jobs and one set of rotors. What we learned from all of this is that lug nut torque is very critical and needs to be the same on each lug nut and applied in a star pattern. This is only one of many stories about this problem we have had.
science and education may disagree, but real life tell a different story. Did you know that science says it is impossible for a bumble bee to fly but the bumble bee proves them wrong every day.
Paul

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84 500 SEL (307,xxx miles)