P I 4P 13010 1985 88 B6 BRAKE RELAY VALVE W JE4 BENDIX 4 646 1 BRACKET RELAY VALVE SUPPORT MOUNTING 4 646 2 COVER RELAY VALVE N S 3 DIAPHRAGM RELAY VALVE N S 4 O RING RELAY VALVE 987 ID 103 WIDE RUBBER 4 646 5 NUT RELAY VALVE CAP N S 6 O RING RELAY VALVE NOTE 1 4 646 7 PISTON RELAY VALVE N S I 8 SPRING PISTON RETURN N S 9 O RING RELAY VALVE PISTON NOTE 1 4 646 10 BODY RELAY VALVE N S 11 RING RELAY VALVE RETAINING NOTE 1 l 4 646 12 RETAINER DIAPHRAGM NOTE 1 2 N S 13 DIAPHRAGM EXHAUST COVER NOTE I 2 N S 14 BODY EXHAUST COVER NOTE 1 2 N S 15 O RING RELAY VALVE 1 242 ID 103 WIDE RUBBER 4 646 16 O RING RELAY VALVE 7 8 ID 1 1 16 OD X 3 32 THK RUBBER I NOTE 1 4 646 17 RETAINER O RING NOTE 1 2 N S 18 SPRING RELAY VALVE PISTON NOTE 1 4 646 19 RING RELAY VALVE RETAINING VALVE NOTE 1 4 646 20 VALVE BRAKE SUPPLY OR DIVERTER INLET EXHAUST NOTE 1 4 646 21 BOLT COVER N S 1 NOTE 1 PART OF 4 646 KIT RELAY VALVE REPAIR INCL ITEM 6 9 11 14 16 20 NOTE 2 PART OF 4 646 COVER RELAY VALVE EXHAUST INCL ITEM 12 14 17 1987 GENERAL MOTORS SERVICE PARTS OPERATIONS M SB G 09 87 46 12 4 000 GROUP I