COMING OUT OF A CAR WASH AT IDLE SPEED AND MOVING INTO THE VACUUM AREA THE BRAKE PEDAL STOPPED RESPONDING, I AM A NOTORIOUS BRAKE RIDER, THE CAR KEPT ROLLING AND ACTUALLY HIT THE VACUUM, ROLLED ON OVER A HILL AND DOWN INTO AN ADJACENT PARKING LOT WHERE THE BRAKES FINALLY TOOK HOLD. AS THE EXPLORER WENT OVER THE HILL I KEPT POUNDING THE BRAKE PEDAL BUT NOTHING HAPPENED. THE CAR ROLLED DOWN THE PARKING AREA AND THEN IT STOPPED. DAMAGE WAS TO THE RIGHT CORNER OF THE VEHICLE AND A VACUUM LAYING ON ITS SIDE. ACCORDING TO THE STATION ATTENDANT THIS WAS NOT AN UNUSUAL EVENT.