If you check the electric motor, which is inside the turret, you'll see that there is a static resistance of 50,000. There is NO brake torque, so applying brakes shouldn't affect the turret rotation at all, but it does.
Applying brakes (that don't exist) nullifies the static resistance.
Steps to reproduce:
- Spawn tank in
- Spin turret around (using roll)
- Notice turret stops right when roll is no longer active
- Apply brakes (any amount)
- Notice the turret now free spins without any resistance.