Oh good point didn't think of that. So this makes me have two other questions. 1) Does the Model 3 have terminals for a 12V car battery (to jump it) like the model S? And if so I wonder if this would allow for you to disengage the parking break.4. Yes
3. Haven't seen the inside, but there is an electric motor you can see mounted on the caliper and can hear it whirl when engaging and disengaging. The owner's manual states that the parking brake cannot be disengaged if you loose electrical power.