Rear Tires Suddenly Lock Up Going 65

A short note about how my brakes locked up. About 1 1/2 to 2 years ago my right front caliper felt a little funny like it was dragging just a little. Since it was fairly new I felt that it was the flex line so I bought one. It sat on top of my tool box untill just this summer when I had to finally change it when the brake completely locked up while I was trying to pull my boat up the ramp. After the pressure bled off I was able to get home without using the brakes, since I am in the country. Point is I had plenty of warning about this condition. Others have mentioned that they also had this type of problem, and I bet some of them knew it before it became totally critical. What is hard to understand is why it didn't happen again, right away. You can check for a hot brake by putting the back of your hand near the wheel and feeling the heat. Don't know if you did that after your panic stop, but it could have told you a lot. One other thing, what does your trans fluid look and smell like? Also, although it is not by any means impossible, it would take a lot of fluid to be trapped to activate two wheel cylinders. A caliper requires much less. The brakes must be almost perfect because usually one could be expected to apply sooner than the other. I don't know if this is true or not, but with a sure grip maybe one locked wheel could stop the other. I don't know, I never tried to find out. A differential guru on here could probalby tell us.