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Ok, I'll check to see if the fluid has boiled and flush it it has.
Your floating pins thought is an interesting one, and if the pins were indeed sticking, then that would explain the drag I am experiencing.
What is doesn't explain is the loss of braking power (pedal travels to the floor almost) that accompanies the phenomenon. If the pins were sticking, then I'd expect drag, but also I'd still be able to stop the car. It's like the calipers are sticking and I'm losing vacuum pressure at the same time.
Also, if the fluid is boiling, and there is a fluid to gas phase change, there is still the same volume of material in my (sealed brake system). So, while gas is much more compressible than fluid, I should have the same hydraulic pressure available in this closed system (?)
Or: could the car be heatin up, the pins start sticking, causing drag, causing heat in the calipers, causing boiled fluid, causing the loss of braking power while the drag from the overheated and stuck calipers remains? When the car cools, the fluid returns to a liquid state, the sticking caused by heat (expanding the pins or the metal around them?) goes away, the drag goes and I've got brakes again. This might explain the problem (you think?) but now the mystery becomes "why did this happen in the first place?" The phenomenon, which as occured twice now, occures spontaneously, without chronological proximity to accident, maintenance, hard driving, or service of any kind. It just started happening. THAT'S puzzling.
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