GM4 55 0 0 Cl G 0 0 0 0 0 0 I 1 n A I N L r I W lll IlIlIIl I E II ll 1 Illl l l lI I I lI 4 U J I U 1 O 1 lj I lI t f M I II II I ll ll 0 I I I IIl l l ll I U 0 l I 1 nin I 0 0 0 0 0 0 0 0 0 GM4 55 1978 B C DIESEL BRAKE HYDRAULIC BOOSTER 1979 A B C E DIESEL BRAKE HYDRAULIC BOOSTER 1 RING Retaining 2 3 7 N S 13 SPRING Piston Rsturn 7 N S 2 ACCUMULATOR 2 7 N S 14 RING Spool Plug Rerum 4 7 N S 3 O RING 2 3 7 N S 15 PLUG Spool Return 4 7 N S 4 HOUSING 7 N S 16 SEAL Ring Spool P ug 4 7 N S 5 SEAL Piston 1 5 7 N S 17 ROD Push 7 N S 6 PISTON 5 7 N S 18 SPRING Spool 7 N S 7 SEAL Housing 1 5 7 N S 19 SEAL Fitting 1 7 N S 8 COVER Flnish 7 N S 20 FITTING 7 N S 9 BRACKET W Studs 7 N S 21 SPOOL SLEEVE 7 N S A 10 INPUT ROD 7 N S 22 SEAL Cheok 6 7 N S 11 BOOT 1 7 N S 23 VALVE Check 6 7 N S 12 RETAINER Spring 1 7 N S 24 SEAL Ring Plunger Seat 6 7 N S 25 SEAT GUIDE 6 7 N S NOTE 1 Part of Group 4 820 SEAL K T NOTE 2 Part of Group 4 820 ACCUMULATOR KIT NOTE 3 Part of Group 4 820 SEAL K T Accumulator Cap NOTE 4 Part of Group 4 820 SEAL KIT Spool Plug NOTE 5 Part of Group 4 922 PISTON KIT NOTE 6 Part of Gruop 4 810 VALVE KIT NOTE 7 Part of Group 4 805 BOOSTER Hyd Pwr Brk 1987 GENERAI MOTORS SERVICE PARTS OPERATIONS OLDSMOB LE 31A 7 87 4 143 4 000 GROUP