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ABS is designed to prevent the wheels from locking up and skidding. This reduces the total braking force applied a bit, because it's quickly pulsing the brakes, but is safer because you still have a bit of steering control.
ABS does the same thing as pumping your brakes, just faster. And you don't need to and probably shouldn't pump the brakes on a car with ABS.
Skidding also reduces braking force though, just from a perspective of car vs road, not break pad vs rotor. Unless im mistaken, and aside from control, anti lock breaks bring the car to a stop quicker, presuming traction break.
You are correct. Anti-lock brakes emulate cadence braking, and are more effective than threshold braking, and far more effective than locking your brakes
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.