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Rears should be quite a while. I usually changes the front twice per one set of rears.
on another note, i can see leaving small tools (screwdriver, socket) in somebodys car, hell ive done that before, but an impact? that is unbeliveable
x2. especially if it's a snapon/matco/mac brand impact. they run 200-400 new depending on what strength and size socket it holds.
i bet the tech is hoping you will come back so he can claim his tool.
as i recall there is a bulletin for cobalt rear brakes concerning them freezing up, yours might be doing that and getting rusty and nasty. as far as warranty goes, i think it is 1 year or 12K for wear items such as clutch or brakes.
and i agree with ilikebmx.... ill take that impact off your hands