Park brake is mechanical. you pull the brake and then lock it so the brake does not release.

 PS:

 1:All e-brake will stop motor power when you pull the brake. Park brake is mechanical. you pull the brake and then lock it so the brake does not release.

2:Mostly for tricycle. You lock the brake, then you can walk away it does not roll down the hill.

3:Park brake is that when you hold the brake then push a switch to lock the brake, so when you take off your hand, it does not move.

tricycle Parking brake lever \ Electric Brake Lever