If you jack both drive tires of an automobile up off the ground, and you don't have a limited slip differential, if turn one wheel the other side will turn the opposite direction. They work that way to allow one wheel to turn slower than the other when turning. Otherwise one wheel would have spin in order to turn a corner
If both wheels turn then it's not the brake. Never heard if you lift the wheels off the ground the the brake releases
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This doesn't work like a car that the brakes are on the wheels. The brake is made into the transmission. As I said earlier the wheels spin because you are spinning the differential gears and not the ring and pinion gears. I guess the best way to explain this put your car in park or in gear and rise the drive wheels, if you have a standard differential you will find that both drive wheels will spin in different directions if the brake isn't holding one wheel.
I think I'm understanding what your saying. I'm about to try the earlier advise about loosening the half inch nut on a couple and see what happens.