AT 11:57 AM THE AIR COMPRESSOR SUPPLYING AIR TO THE PRODUCTION HOIST BRAKE KICKED OUT. THE BRAKE SEAL WAS LEAKING AIR, BUT WHEN OIL WAS APPLIED TO THE SEAL IT SOFTENED ALLOWING THE HOIST BRAKE S TO RELEASE. THE AIR COMPRESSOR WAS RESET AND A MAN ASSIGNED TO OIL THE SHAFT AND SEAL OF THE BRAKE ENGINE. MINE EVACUATION BEGAN AT 11:57 AM.