TM  10-3930-643-34 BRAKE  TROUBLESHOOTING  AND 8-13. Treadle  Valve  (S/N ASSEMBLY MAINTENANCE. 2001 and above). (Sheet 6 of 8) 26. Lubricate  new  preformed  packings  (33 and 32) with clean grease and install. 27. Install new spring (30) and new valve (29) in valve body (31). 28. Lubricate center bore of body (34) with clean grease and install. 29. Install items 33 thru 29 as an assembly and ring (28) in body (34). 30. Using flat tip screwdriver, install diaphragm  (27),  washer  (26)  and  screw (25). Tighten screw (25) to 7 in-lb. Go to sheet 7 8-59