l 1 GM04 255 I Q 080885 21 9 I I 20 Qs A 3 X 2 I I I R uy I 2 9 1 1 x 1 ia 1 I 8 et z xk 1 x m 4 l 17 A Q 19 12 I S Z l 16 Q 3 0 zz gy J I 14 5 S9 W7 X5 4 s 7 A 25 31 27 X 28 V 1 I II I 32 g 1 3 30 6 2 Q j V 11 10 DM5189E121 GM04 255 1982 1986 G BRAKE BOOSTER VACUUM DUAL DIAPHRAGM MORAlNE NOTE SEE PARTS CATALOG FOR POWER BOOSTER CHART IN GROUP 4 901 I 1 N S BOOT 1 2 7 2 Q 2 N S SILENCER 1 2 4 I 3 N S VALVE VACUUM CHECI 1 2 3 I 4 N S GROMMET 1 2 3 A 5 N S SWITCH VACUUM SOME MODELS 1 2 5 6 N S GROMMET 1 2 5 7 N S SEAL FRT HOUSlNG 1 2 8 N S BEARING PRIM PISTON 1 2 A 9 N S HOUSING RR 1 10 N S HOUSING FRT 1 11 N S SPRING RETURN 1 12 4 924 ROD VAC PWR BOOS PISTON 1 13 N S RETAINER REACTION 1 14 N S SILENCER POWER HEAD 1 2 4 15 N S RETAINER DIAPHRAGM 1 2 4 16 N S V DIAPHRAGM PRIM 1 2 17 N S PLATE PRIM SUFPORT 1 I 18 N S BEARING PISTON SECD 1 2 19 N S DIVIDER HOUSlNG 1 20 N S DIAPHRAGM SECD 1 2 21 N S PLATE SUPPORT SECD 1 22 N S DISC REACTION 1 2 6 23 N S PISTON REACTION 1 6 LE 24 N S RETAINER BODY REACTION 1 4 6 I 25 N S BODY REACTION 1 6 I 26 N S SPRING AIR VALVE 1 4 27 N S BUMPER REACTION 1 2 4 28 N S RING RETAINING 1 2 4 4 i 1991 GENERAL MOTORS SERVICE PARTS OPERATIONS CHEVROLET 17W t I I 6 91 4 167 4 000 GROUP