TM  10-3930-643-34 GENERAL  SUPPORT  BRAKE  MAINTENANCE.  (cont) 17-2. Pressure Converter (S/N 2001 to 2903). (Sheet 4 of 7) DISASSEMBLY 18. Separate items 26 and 28 as an assembly from items 27 and 29 thru 31 as an assembly. 19. Remove  and  discard  preformed  packing (28) from plate (26). 20. Remove felt (29), cup (30) and spring (31) from piston (27). Discard felt (29) and cup (30). Go to sheet 5 17-12