Why would rear brakes act like they are frozen backing up?

What is your question?

220,000 miles, manual transmission. Car worked fine this morning, 5 PM car started fine, can't back it out of driveway without lots of grinding and needing to be heavier on the gas. Feels like brakes are frozen. Can back it with difficulty and forward does the same thing. It is very moist outside, almost like fog, 33 degrees for several days and I did wash the car yest. and underside. Just had oil changed and fluids checked last week. Sway bars due for repair tomorrow.