Rear brake restriction
I have a 1978 Toyota pickup. Usually, when I back out of my driveway, the rear brakes(as far as I can tell) will make a loud rubbing sound then freeze up on me after a partial rotation. I'll usually force it a few times, then I can get it loose and the sound goes away. It doesn't happen again until the next time. I've taken it to 1 or 2 mechanics and they tell me my brakes are OK. Your input would be appreciated. Thank you.