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the brake booster does have moving parts but not many. inside the shell there is a diaphram seperating two seperat chambers. that diaphram is connected to the shaft that pushes on the MC. one chamber, towards the front of the car has a vaccum, the other has a vaccum until you step on the pedal. when you do that it opens a passage that allows atmospheric pressure into it. the pressure differential adds extra force to the MC shaft.
basically the only thing that can go wrong is the diaphram can leak and you will loose the extra power. i guess it could be rusted out inside but it's unlikely since it's high up under the hood and most cars pull air from inside the passenger compartment anyway. it's more likely that some of your calipers or rotors are bad. just jack the car up and check out everything. i assume you mean the pedal stroke is getting crunchier, not what the brakes feel like after they've been applied.
on a side note, what are the specs on your wheels?
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