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Atypical BOM Failure Mode?

My '87 5KTQ has developed a new symptom..
Brake pressure/action/pedal feel are all normal at startup, but after 30 
min. driving, pedal gets soft and braking is drastically diminished. Feels 
like the rotors are greased.
Multiple pumps give a brake warning light at this point, but not at 
startup. If it were the BOM, I would expect a hard pedal in the morning, 
with things returning to normal as the pump builds pressure.
Any help/BTDT type experience would be appreciated.
Best regards,
Mark Woodland