The sensor doesn't actually measure the pad wear. You can be low on pads in actuallity and replace them. Your sensor will still indicate the pads are low unless you get the counter reset. The sensor serves to wear thru at the extreme limit of use then gives a different warning which is a real indication of need for pads not just a computer guestimate based on driving style.
02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW exhaust|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|apr gt 250 & splitter|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs|