I agree with zpb. I'd also like to raise another question on this talk of ABS...

ABS is an abbreviation for Antilock Braking System. By saying antilock one assumes that there is a mechanism in place to detect when locking occurs so that action can be taken to avoid it.

Do ESCs even do this detection?

I have a suspicion they do not, and I also think that they don't really need to.

As ZPB already pointed out, a motor's braking force increases with RPM assuming a constant shorting resistance across its poles. This leads me to think that ABS would be unnecessary in a brushless braking system as the motor itself naturally applies less braking force as it slows down.

The only time I can see ABS being of value is if there were devices monitoring the rotation of the wheels themself so that braking force could be released if only one wheel locked (while the diff action kept the motor spinning).

What do you all think?