ON TWO SEPARATE OCCASIONS (THE SECOND DATE WAS ABOUT 2 MONTHS AGO), I HAVE HAD TO MAKE VERY HARD STOPS AT FREEWAY SPEEDS. BOTH TIMES, THE CAR CAME TO A STOP WITH THE ANTI-LOCK BRAKES FUNCTIONING PROPERLY (BRAKE PEDAL VIBRATIONS INDICATING CORRECT MODULATION). ONCE THE CAR COMES TO A COMPLETE STOP HOWEVER, THE BRAKES SUDDENLY FAILED COMPLETELY. THE BRAKE PEDAL GOES TO THE FLOOR WITH ABSOLUTELY NO BACK PRESSURE. THE CAR BEGINS TO ROLL AGAIN, INDICATING THE BRAKE CALIPER/PADS HAVE RELEASED THE DISK. THE ONLY WAY I WAS ABLE TO STOP AGAIN WAS TO PUMP THE BRAKE PEDAL, ACTIVATING THE STABILITY CONTROL MODULE TO BOOST HYDRAULIC PRESSURE TO THE BRAKING SYSTEM. THIS SEEMS RELATED TO THE PREVIOUS ISSUE OF BRAKES NOT FUNCTIONING ON START-UP DUE TO LOW VACUUM. FOLLOWING A HARD STOP, THE VACUUM BOOST TO THE BRAKES APPARENTLY BECOMES DEPLETED, CAUSING BRAKING SYSTEM FAILURE. I HAVE REPORTED THIS TO MY DEALER AND THEY HAVE BEEN UNABLE TO RE-CREATE THE PROBLEM. DUE TO THE POTENTIAL DANGERS THIS PRESENTS, I FELT IT IMPORTANT TO REPORT THIS SINCE THE DEALERSHIP SEEMED UNWILLING TO PURSUE THE ISSUE. *TR