TM10-3930-660-20 12-6. SERVICE BRAKE SHOES -   INSPECT/REPLCAE(Cont’d) c. d. e. Use a piece of wood against shoes (1) to push pistons (6) completely into brake housing (4). Tighten bleeder valves (5). Remove shoes (1) from brake housing (4). INSPECT SHOES (l). a. Inspect shoes (1) for wear. Replace shoes (1) if thickness is less than 1/8 inch. b. Inspect shoes (1) for uneven wear. Replace shoes (1) if thickness varies between linings (l). If shoes (1) are worn unevenly, check pistons for correct operation. Replace pistons that are locked in the bore. Check that the disc surface is flat and parallel to the linings. Notify Direct Support Maintenance. 12-13