TM 9-2815-225-34&P 3-50.  ENGINE RETARDER REPAIR (Contd) LOCATION/ITEM ACTION REMARKS a.  Disassembly (Contd) 7. Center seal ring (6) and Remove from brake housing Discard seal rings (5) and (6). upper seal ring (5) assembly (20). 8. Lower seal ring (7) Remove from solenoid valve Discard lower seal ring (7). assembly bore on brake housing assembly (20). 9. Two screws (14), washers Remove from bottom of brake (13), and master piston housing assembly (20). springs (12) 10. Two master pistons (11) Remove from brake housing Slide out of bores. assembly (20). 11. Two locknuts (8) Loosen.   Locknuts (8) must be loosened to remove setscrews (9). 12. Two setscrews (9) Remove from brake housing Keep locknuts (8) on setscrews (9). assembly (20). WARNING Retaining  ring,  spring,  and  slave  piston  retainer  are  under  heavy  compression.    Wear  eye protection.  Use deepwell socket and C-clamp (or vise) to remove.  Failure to comply may result in injury to personal. 13. Two retaining rings (15) Remove from brake housing Slowly remove tension on retaining assembly (20). rings (15) by using deep-well socket and C-clamp (or vise). 3-306