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If you’re in “Hold” regen brake mode, then the car is trying to apply the brake when it’s stopped. That’s the clicking sound of the solenoid activating the brake.
I agree with that observation... It looks like you're trying to get the car to get closer to the car in front of you than the TACC wants to... So you let off and it drops the brake. It would have stopped before that point.
If you’re in “Hold” regen brake mode, then the car is trying to apply the brake when it’s stopped. That’s the clicking sound of the solenoid activating the brake.