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There are a few factors that could influence that problem.
First, if the rear calipers or caliper slides are seizing (I know the rears were replaced, but go with this) then the rears could theoretically wear faster than the fronts.
If the front brakes are frozen from stuck caliper slides, then the rears could ALSO wear faster than the fronts.
Often a spongy pedal is a direct result of the rear calipers being frozen or activating slowly. The reason is differential application of the pads, which distorts the solid rotor and simulates a lack of fluid pressure in the rear circuits.
Fronts can succumb to similar fate, but it's usually a direct result of a frozen caliper slide, which in turn causes similar problems. The rears distort more easily than the fronts, however, and it sounds as if the rear brakes are at fault, not the fronts. If a reputable shop did the 4-wheel brake job, they should have cleaned and greased the caliper slides anyway. Volvos aren't the only cars with that type of caliper; they're common on other makes as well.
Naturally there could be a defective hydraulic component as well. Do you get any ABS activity on hard stops on wet pavement? I'd expect it to be very active if the rears were actually accomplishing most of the braking.
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1992 940 wagon, 72k
make people envious; smile often.
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