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I have a different opinion. The brake system does indeed operate when you start the car, but it is not a feature that it is stiff when the car has not been operated for a while. Try this, turn off the engine and push the brake, it feels kinda normal, now release and push again... you notice the difference? Release and push again, it should be too stiff. It is more like compressing the brake fluid because the of valve not being released back to rest position. It is not there to clean the discs or de-rust them as I had that in my old Ford Orion (I don't know if it was ever on the US market) and it is a very old car and rather cheap one. I've heard of people claiming that if you press brake when the engine is off and leave the car, there are chances that the hydraulic pipes of the brake system will spread open under specific conditions.
I'm no car mechanic, so I may be wrong in any of the above... if you are a car mechanic feel free to correct me (in a nice way, not rude :P )
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