One problem related to brake abs warning light has been reported for the 2004 Mini Cooper S. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mini Cooper S based on all problems reported for the 2004 Cooper S.
I was parked one after noon looking under the hood and I heard a crackling sound coming form the abs pump. There was a small puff of smoke and then the sound stopped. At this point I went about my business and returned to my 2004 Mini Cooper S and the abs/traction control light were out. A few days later I took the vehicle to the BMW dealer and after a few tests they determined it was just bad fuses. A week has past and I have had no other problems.