1 I I I I I I I GM04 25B n T 1 A 0010115 A 25 Ek 4 5 1 5 1 1 1 4 I I 10 I I I I I A 1 1 11 1 1 1 3 1 I 1 G o 1 W l 7 1 1 WI 1 1 1 1 15 rz I Q 12 V J 4 16 1 x g I 1 13 1 1 A I I I 1 1 1 1 1 1 1 1 I 1 Q 1 1 1 V 1 6 DI31 0l 1 1I 1 1 1 I A 1 GM04 256 I I 1987Y G BRAKE BOOSTER VACUUM SINGLE DIAPHRAGM MORAINE A 1 BOOT 1 2 N s 10 PISTON ROD KIT Pwr Boos 1 1 N s 2 SILENCER 1 1 1 1 1 1 N s 5 1 1 RETAINER Reacti0n 1 N1s 3 VALVE Vacuum Chock 1 2 3 N S 12 FILTER 1 4 1 N S 4 GROMMET 1 2 3 5 1 N s 13 RETAINER Diaphragm 1 2 N s 5 sEA1 1 r1 1 1ous1 g 1 2 N s 14 DIAPHRAGM 1 1 2 N s 6 BEARING Power Pist0n 1 2 A N S 15 SUPPORT Diaphragm 1 N S 1 1 10us1NG Rr 1 N s 16 POWER PISTON PUSH ROD ASM 1 0 Rousmc 1 Frt 1 111 N s 1 4 1 E 111 1 1 111 11 11 N S 1 9 SPRING Return 1 N S 25 SWITCH Vacuum Some Models 1 2 5 1 1 11 11 11 111 11 N s See Parts Catalog For POWER BOOSTER CHART At The End Of Group 4 000 1 NOTE 1 SERVICE PWR BOOSTER Group 4 901 lncls 1 thru 25 NOTE 21 Powzn BOOS REPAIR KIT Group 4 393 lncls 1 3 4 5 6 13 14 25 I NOTE 3 VALVE GROMMET Group 4 955 lncls 3 4 NOTE 4 PISTON KIT Group 4 922 IncIs 12 16 NOTE 5 vAcuuM SWITCH KIT Group 4 906 Incls 4 25 V r 11 5 1990 GENERAL MOTORS SERVICE PARTS OPERATIONS PONT AC 22W 6 90 4 151 A 4 000 GROU P