they all do it, its normal.

get your abs scanned, fix that issue.

what happens is your now listening and feeling for stuff, well you found it, but its done it for years.

ride the brake pedal as you pull off, you'll feel it do the self test.


what year is your car? 97/98 seem to do it much louder. some times its silent in my car, but i feel/hear it 99% of the time. as well as many others.