One problem related to brake disc caliper has been reported for the 2004 BMW M3. The most recently reported issues are listed below.
The contact owns a 2004 BMW M3. While driving 65-70 mph, the calipers locked suddenly. The contact pulled off the highway and waited for the calipers to cool down in order to drive the vehicle. The manufacturer stated that they had never heard of this type of failure. Currently, the dealer is replacing the calipers, rotors, and brake pads. The current and failure mileages were 37,000.