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[k44]

Couldn't tell by your description just what an "out of round feel" is.

Sounds like you're braking and decelerating normally from 35 mph, then the pedal does some weird vibration at about 30 mph, then you continue braking and it's back to normal till you get down to maybe 20 mph and the brake pedal vibrates again, and smooths out again, and then you finish the stop?

Maybe your vehicle speed sensor is hooked up to the wrong wire and you're overloading that part of the ECM and it's having trouble figuring out how fast you're going. While it's confused it might be activating ABS or ATRAC or something.