One problem related to air brake disc caliper has been reported for the 2000 BMW 328. The most recently reported issues are listed below.
Was pulling into parking space when brakes gave out. Car hit 2 trees and came to stop. $6500 body damage. Body damage repaired. Breaks after inspection require over $1500 repair. Break calipers bent. Technician attributes break failure to calipers being defective and weak in all 3 series and 5 series BMW.