THE POWER BRAKING SYSTEM HAS STOPPED WORK ,BRAKE PEDAL GOES TO THE FLOOR AND WILL NOT STOP THE VEHICLE ,I SEE THAT BMW HAS A RECALL ON THE 2007 X5 MADE THE SAME YEAR AND MODEL WITH THE V8 ENGINE, I AM A MEMBER ON MY FORMS AND THERE ARE HUNDREDS OF BMW X5 WITH THE SAME PROBLEM, AND SOME PEOPLE HAVE HAD ACCIDENTS BECAUSE OF THE BRAKING SYSTEM SUDDENLY NOT WORKING , I HAD MY BMW X5 AT THE BMW SHOP AND THEY DIAGNOSE WAS THE VACUUM PUMP HAS FAILED , VACUUM TUBE IS LEAKING AND THE BRAKE BOOSTER HAS FAILED ALSO. THIS IS A SERIOUS PROBLEM , THIS IS NOT A TAIL LIGHT NOT WORKING , THIS IS PUTTING PEOPLE LIVES IN DANGER. THE REPAIR COST IS $2300.