BRAKE SYSTEM FAILURE INVOLVING MASTER CYLINDER AND BOOSTER. LEAKING INTERNALLY. REPLACEMENT COST OF $1500 RESEARCHED CX9 AND FOUND THIS PROBLEM IS WIDESPREAD AND NOT BEING ADDRESSED.WE HAD A MINOR FENDER BENDER THAT COULD HAVE BEEN MUCH WORSE. MAZDA USA HAS NOT ISSUED ANY BULLETINS AS OF YET. *TR