A GM04 1791 I 1985 1987 G POWERMASTER I MORAINE 1 4 663 SWITCH PRESSURE 1 2 18018141 2 N S O RING 1 2 3 4 647 ACCUMULATOR KIT BRK MAST CYL 18014978 4 N S O RING 1 3 5 N S NUT 1 6 N S WASHER 1 V 7 N S GROMMET 1 v 8 4 647 PUMP MOTOR KIT 18011279 I 9 N S CLAMP HOSE 1 10 4 660 HOSE KIT PWR BRK SUMP 18011403 1 1 4 845 HOSE M CYL PRESS 17980467 12 N S TUBE W NUT 1 13 N S BOLT 1 14 N S BRACKET ASM 1 15 4 648 BRACKET PWR BRK MTG PKG 18010877 16 4 658 PUSHROD W RETAINER 18011544 17 4 659 BOOT KIT PWR BRK BOOS PUSH ROD 18011398 18 N S RETAINER 1 I 19 N S GUIDE P STON 1 4 20 N S O RING 1 21 N S O RING 1 22 N S BODY GROUP REACTION 1 z 23 N S PISTON REACT ON 1 24 N S DISC REACTION V 25 N S POWER PISTON ASM 1 26 N S PISTON ASM PRIMARY 1 27 N S SEAL SECONDARY 1 I 28 N S RETAINER SPRING 1 I 29 N S SEAL PRIMARY 1 30 N S PISTON SECONDARY 1 4 31 N S SPRING 1 32 4 651 COVER W DIAPHRAGM 1985 1801 1388 4 651 COVER W DIAPHRAGM 1986 87 18013293 33 N S RESERVOIR 1 4 A 34 N S GROMMET RESERVO R 1 35 N S GROMMET RESERVOIR 1 36 N S SEAT W SEAL VALVE 1 37 N S POPPET 1 38 N S SPRING 1 39 N S BODY POWERMASTER 1 NOTE 1 GROUP 4 650 CYLINDER POWERMASTER BOOST INCLS 1 THRU 39 NOTE 2 GROUP 4 663 SWITCH PRESSURE INCLS 1 2 4 NOTE 3 GROUP 4 647 ACCUMULATOR PKG INCLS 3 4 1 NOTE 4 CONFIGURATION WILL VARY PER APPLICATION j i 1991 GENERAL MOTORS SERVICE PARTS OPERAT ONS BUICK 44W L 1 6 91 4 129 4 000 GROUP