I have recently had a brake job (Front & Rear - Rotors, Pads & Sensors) for my 2000 328 (49K miles). My suspicion was raised after the wife reported a bad noise coming from the front when she drove the car. That turned out to be the inner wheel well rubbing on the tire, but I checked the pads at the same time. I noticed that they were low on both front and rear. However, I did not have any pad warning lights. I decided to put it on my list of "to-do's" for next month. Sure enough the following day! the brake pad sensor light came on. - Hence the brake job. In my experience the brake pad sensor lights are quite reliable, but they only check pad thickness, any other brake problem you should get checked. Must tire places will do a free inspection and give you thier opinion on what needs doing. - Hope this helps.