The mechanic never explained to me exactly what this meant. The brakes seem okay now, but I am still worried. Thanks, Dana Dear Dana, With respect to the overall problem, you might have gotten a set of defective pads in the first place. This could cause a lot of noise and if glazed they will not stop properly. Glazing occurs when new brakes get hot from hard braking.
Resins come to the surface of the pads and form a coating that affects braking ability.
I suspect the grooves in the rotors were very small, like a record, but that is normal wear caused by metallic brake pads. But they don't cause any problems. Calipers would not be the cause of uneven tire wear. It is more likely that the tires just were not inflated to their proper level. It sounds like Sears wanted to sell a lot of parts that were not needed.