I have a 1994 Mazda Navajo LX 4x4 with auto locking hubs. I did a brake job last month, and took off the rotors to get them cut. About a month later, I was driving in a parking lot and i noticed the passenger tire started making a crunching poping noise. When I turn to the wheel right to turn the corner the noise either stopped or quieted down. But slow driving speeds in a straight line will allow you to hear the noise. Im pretty sure it is not the bearings, because i did them myself, but i could be wrong. I was thinking it might be a suspension part or a shock or something.