PISTON RING SPRING RUBBER SPRING PISTON PRIMARY Y INLET EXHAUST VALVE DELIVERY PORT I PRIMARY SUPPLY PORT BLEED PASSAGE OUTER RELAY PISTON RELAY PISTON I INNER RELAY PISTON RE URN SPRI G t LOWER INLET EXXHAUST SECONDARY DELIVERY Q VALVE PORT Y I ll SEcONDARY SUPPLY EXHAUST pom Pom I I zo PISTON 2 BOLT i IL 3 WASHER 6 2l GROMMET 4 sEAT 5 BUMPER 22 SEM ml Im 7 GR MMET Q O 24 Gnommsr 26 GROMMET 9 PRIMARY PORTION 27 COVER OF VALVE BODY 1 v 4 I Y 28 BOLT AND I J LOCK WASHERS I0 DISC A Y c 94 29 msc Assv 11 BODY L B H 30 BODY I 31 RETAINER I2 RETAINER E Y g 32 snnmc I3 PRING 3 33 Gnommsr 4 wA HER 34 SEAL 15 GROMMET 35 GUIDE I6 36 RING f Z ml sw IIB RING C 4 see 38 DISC ASSY lI9I RING 39 RING 1967 71 SER 60 EMERGENCY AIR BRAKE CONTROL VALVE EXC TILT 1 4 640 RETAINER Cont Valve 21 4 640 GROMMET Cont Valve 9034628 Piston 2407674 22 N L SEAL 2 8 900 BOLT Hex 1 4 20 x 5 8 23 4 640 PISTON Cont Valve Inner 3 4 640 WASHER Cont Valve Piston Relay 9034635 Spring 9029577 24 4 640 GROMMET Cont Valve Piston 4 4 640 SEAT Cont Valve Assy 9033604 Seal 2407673 5 4 640 BUMPE R Cont Valve Piston 25 4 640 SPR NG Cont Valve Relay Assy 9029574 Return 9034637 6 4 640 PlSTON Cont Valve 3912190 26 4 640 GROMMET Cont Valve Piston 7 4 640 GROMMET C nt Valve Cover 9034639 Piston Seal 2407673 27 4 640 COVE R Cont Valve Piston 3936220 8 4 640 SPRING Cont Valve Piston 28 8 931 L WASHER 5 16 Return 9034645 8 900 BOLT Hex Hd 5 16 x 7 8 9 N L BODY PART of 4 640 CONTROL 29 4 640 DISC ASSY Cont Valve ASSY Lower 9034640 10 4 640 DISC ASSY Cont Valve 30 4 640 BODY Cont Valve Lower 3912182 Upper 9034629 31 4 640 RETAlNER Cont Valve 11 4 640 BODY Cont Valve Lower 3912178 Lower Seal 9034631 12 4 640 RETAINEFl Cont Valve 32 4 640 SPRING Cont Valve Lower 9034641 Upper Disc 9034630 4 640 GROMMET Cont Valve Lower 13 4 640 SPRlNG Cont Valve Upper 9034632 Seal 2405320 14 4 640 WASHER Cont Valve Upper 34 N L SEAL Spring 9034633 35 4 640 GUIDE C nt Valve Lower 9033464 15 4 878 GROMMET Cont Valve Upper 9023324 36 8 900 RlNG Type T 16 N L SEAL 37 4 640 SEAT Cont Valve Exh 17 4 640 RETAlNER Cont Valve Upper Check 9034643 O Ring 9034634 38 4 640 DISC ASSY Cont Valve 3 18 8 934 RlNG Snap Exh Check 9034644 19 8 934 RING Snap 39 8 934 RING Type Int Ret 20 4 640 PlSTON Cont Valve Outer Relay 9034636 l 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 31S REV 5 71 4 106P