Rear Tires Suddenly Lock Up Going 65

Rear rubber brake hose is a good scenerio. Keep us posted on this one. My wifes VW beetle brakes would slowly apply (all 4) she kept coming home saying there was no power and by the time i would go check it would roll fine. then 1 day I was waiting when she pulled up and I jacked up all 4 corners and the brakes would be applied on all, but after a couple of minutes they would cool and release. Drove me nuts. found that the rod between the pedal and master cyl. was adjusted just a tad too long (she liked having pressure at the pedal all the way up) quick adj. of rod fixed it. I know this is a different car and system but brakes do some crazy things.