I just went through buying the wrong pads for my truck and dealing with a worse case scenario. They where the most expensive pads they sold and since I'm heading to the mountains in CO real soon, I felt it was a good idea to get the best pads out there. They went on very tight, but I figured they would just wear off and be fine. They had five sections, all a different size. They got so hot that when I went through a puddle of water, it turned to steam. A buddy of mine owns an auto repair shop, so I went to him and had him look at them. He said that this was very common with those pads and that they sand them down to get them to fit bitter. They make them bigger then factory stock pads so they can claim a longer life out of them.
All was good until one of my tires picked up a screw a couple days later. I went to my buddies shop to have him fix my tire and the brakes where to tight that they couldn't turn the tire. He told me that he had dealt with this problem previously and after months of being lied to by the rep from the company, finally got them to admit to the problem. Turns out that the City of Dallas returned 140 sets of pads for this same issue recently.
What happens is the pad is divided into 5 sections, that are all different sizes. The smallest section gets hot faster then the others and then expands, which causes it to get hotter. The sections next to this one then get hot and they expand too, so that quickly, all of the pads are hot and dragging on the rotor. Three days of this warped and ruined my rotors, pistons and other parts that had to be replaced. My friend said to stick with factory parts and he had all new, Ford, parts deliverd to his shop. The store that I bought the pads from admitted to the problem with the pads, including the story about the City of Dallas. They supplied every part for free, and refunded the original purchase for the bad pads.
I lost a day of work dealing with this and my buddy charged me $200 for labor to fix everything. The auto parts store filed a claim with the manufacturer of those pads to reimburse me for the labor, which the manager said they will probably agree to. If they only pay part of it, he said that they will make up the difference.
I'm intentionally not naming names here, but if somebody really needs to know who I'm talking about, just send me a PM and I'll reply. Until this is all worked out, I'm not going to go public with any names. Just stick with factory parts and you will avoid all this.