Powerboost light pulse and woosh noise when breaking to a stop

[RocketFistMooga]

Powerboost owners. When breaking to a full stop I hear a light "woosh" sound and a pulse in the break pedal. This happens once under 5 miles an hour. It is not alarming and seams to be meant to do this but I am very curious what it is exactly. I thought maybe a transition between regen breaking and regular breaks? Interested if anyone knows. Again it very much seams like it is meant to do this.

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[Porpoise Hork]

I've noticed this as well. Mostly when under light/moderate brake pressure and the Eco Coach shows the braking force just extending past the max charge to the left of the bar. Probably just a PB thing and nothing to worry about. Maybe others can confirm that.