HOISTMAN LOST BRAKE PRESSURE ON AUTOMATIC, BUT COULD RUN ON MANUAL SURFACE SHOP THE HYDRAULIC TANK & CLEANED THE SCREENS. MSHA WAS CALLED AT 9:40 A.M. AND TOLD HOIST WAS DOWN. AFTER MAINTENA NCE WAS COMPLETED, HOIST WAS RETURNED TO SERVICE & MSHA WAS CALLED & TOLD HOIST WAS BACK IN OPERATION AT 1:25 P.M.