GM04 255 1985 86 CK BRAKE BOOSTER VACUUM DUAL DIAPHRAGMXMORAINE 1 BOOT 1 2 7 N S 2 SILENCER 1 2 4 7 N S 3 VALVE Vacuum Check 1 2 3 N S 4 GROMMET 1 2 3 N S 5 SWITCH Vacuum Some ModeIs 1 2 5 N S 6 GROMMET 1 2 5 N S 7 SEAL Frt H0using 1 2 N S 8 BEARING Prim Piston 1 2 N S 9 HOUSING Rr 1 N S 10 HOUSING Frt 1 N S 11 SPRING Return 1 S N S 12 ROD KIT Vac Pwr Boos Piston 1 4 924 13 RETAINER Reaction 1 N S 14 SILENCER Power Head 1 2 4 V N S 15 RETAINER Diaphragm 1 2 N S 16 DIAPHRAGM Prim 1 2 N S 17 PLATE Prim Support 1 N S 18 BEARING Piston Secd 1 2 N S 19 DIVIDER Housing 1 N S 20 DIAPHRAGM Secd 1 2 N S 21 PLATE Support Secd 1 N S 22 DISC REACTION 1 2 6 N S 23 PISTON Reaction 1 6 N S 24 RETAINER Body Reacti0n 1 4 6 N S 25 BODY REACTION 1 6 N S 26 SPRING Air VaIve 1 4 N S 27 BUMPER Reaction 1 2 4 N S 28 RING Retaining 1 2 4 N S 29 FILTER 1 2 4 7 N S 30 RETAINER 1 4 N S 31 O RING 1 4 N S 32 ROD ASM Air Valve Push 1 2 4 N S 33 PISTON Power 1 6 N S See Parts Catalog For POWER BOOSTER CHARTAt The End Of Group 4 000 NOTE 1 SERVICE PWR BOOSTER Group 4 901 Inc s 1 Thru 33 NOTE 2 PWR BOOS REPAIR KIT Group 4 898 lncls 1 Thru 8 14 15 16 18 20 22 27 NOTE 3 VALVE GROMMET Group 4 955 lncls 3 4 NOTE 4 A R VALVE PLUNGER VLV Group 4 918 Inc s 2 24 26 Thru 32 NOTE 5 VACUUM SWITCH KIT Group 4 918 lncls 5 6 NOTE 6 PISTON KI Ij Group 4 922 lncls 22 23 24 25 33 NOTE 7 BOOT REPAIR KIT Group 4 940 lncls 1 2 24 r 1988 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 52R 1 88 4 19 4 000 GROUP