My daughter just bought a nice 760 Turbo with 130,000 mi. When test driving, one thing I was impressed with was the brake system. Very firm pedal, very little pedal movement needed to stop the car and absolutely zero creep when holding it stopped for an extended period. Even the hand brake gives only 2 clicks before engaging. The exhaust system, at least cat-back, is another story and became priority 1 when she purchased the car. She planned to address that asap and only drive the car 6 mi round-trip to work for a week or so until she could schedule repair...

...until deciding the car could handle one 120 mi road trip, to a campground, and ripped the muffler off on a bumpy dirt road.

On the trip home the brake pedal went to the floor on the exit ramp. She pumped it and said it "caught" on the 4th or 5th pump. She limped a couple hundred yards to a grocery store parking lot and left it.

Today, in the parking lot, the brakes are fine. No visible loss of fluid, either in the reservoir or under the car.

During the trip home on the highway my 10yr old daughter, in the back seat, said the seat was getting hot - probably a result of the partially missing exhaust system. (I'm 400 miles distant and haven't actually seen where the exhaust separated.)

Are these two incidents related? Boiling brake fluid? I've plenty of experience working on my own 740 and 745T brakes but have never encountered this failure mode.
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1990 745T 346K mi