Yes, have the brake fluid flushed. The dealer will do it for free if the car is still under the free maintenance agreement. If the free maintenance period has expired take the car to a reputable indie shop that specializes in bimmer. Try
www.bimrs.org to find a shop in your area. Brake fluid is highly hydroscopic-it likes water. Water damages the calipers. Flush the brakes every 2 years regardless of miles.