I'm not sure what you mean by "mechanical brakes". The brakes on a Tesla are normal hydraulic car brakes that do exactly that. They work even without power (mor

I'm not sure what you mean by "mechanical brakes". The brakes on a Tesla are normal hydraulic car brakes that do exactly that. They work even without power (more force required, of course). But just like in many modern cars, there is no separate manual parking brake.