Hello. I have a 2004 tundra 4x4 and have been have this weird vibration in my brakes ever since I got new drums and rotors/pads but it's different than warping. Midas told me they couldn't find anything wrong however, I just pulled off the drums and one of the shoes is tapered. The other 3 are pretty uniform, but the passenger rear front changes thickness from one end to the other. Is this normal? I am not as familiar with drums as disc. Thank you.