ABS/pumping the brakes is implemented because sliding friction is less that static friction. It’s why you can nudge something on a slope to start sliding and it doesn’t stop but would have happily sat there before hand.
Your car wheels experience static friction because while in motion the patch in contact with the road isn’t moving. Or at least they do until you skid.
So ABS brakes/releases to get a new round of static friction.
Pumping the brakes is probably a phrase that came from before power assisted brakes (when you were manually pressurizing the hydraulics) but still had relevance because it was also ABS.