That's not ABS.... ABS only engages in full pressure, foot to the floor all out braking or on slippery surfaces. Plus, you would hear the pump activate, as it is a very loud and low rumble. Trust me, you'll know when ABS activates. The warped feel seems to be a common problem on 7th gen Accords. I'd take it to the dealer and have the tech drive it with you. You're under warranty, take advantage of it.