Well that usually means the brake master cylinder is bad. The piston inside has seals and the seals are letting the fluid go by and then no pressure. It could actually be leaking into the brake booster and that is why you don't see any fluid on the outside. If you pump them up for now, it will hold, but this won't last all that long. Another symptom is after you pump it up is putting slight pressure on the brake and see if it slowly goes to the floor, just another sign of master brake failure.
Let us know how it goes.
Russ
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