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Renault Zoe ZE50 Intens R135
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AFAIK the auto hold on the Zoe does not use the handbrake. Rather it uses valves on the hydraulic brake system to 'trap' pressure in the calipers (you can hear them click on and off). So when the driver applies sufficient pressure and the car comes to a halt for a set time the valves close (and the motor stops applying torque) to hold the car in place. If the car does not move for a few minutes then the electric handbrake is activated (you can hear the electric actuator whirring).

My speculation is that it is engineered this way to allow for creep maneuvering at very low speeds (when parking or slow traffic) using the brake pedal (like an automatic ICE car) without continuously engaging auto hold. I've gotten used to it and it doesn't bother me. I like that I can modulate the brake to either engage or not the auto hold. Others might have different preferences.
 
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