1981 BRAKE SYSTEM USAG E CHART 1981 P TRUCK GASOLINE ENGINE 42 MODEL BRAKE SYSTEM SPE FI A 0N OPT HVY BASE BRAKES DUTY BRAKES MODEL BRAKE MERCHAND BRAKE MERCHAND NO RPO RPO RPO RPO P20842 125 0 SB00 SINGLE JB6 STD JB7 J55 P20B42 125 0 7500 SINGLE JB7 J55 P20B42 125 0 8000 SINGLE JB7 J55 PZ1042 133 0 6800 SINGLE JB6 STD JB7 J55 P21042 133 0 7500 SINGLE JB7 J55 PZ1042 133 0 8000 SINGLE JB7 J55 I gp 345 I wu n I warm emma Ig g y mg JS PSUBGZ 125 0 I 8200 SINGLE JB7 STD JB8 J55 P30B42 125 0 9000 SINGLE JBB J55 P30B42 125 0 9000 DUAL JBB J55 P30B42 125 0 10000 DUAL JBB J55 P30842 125 0 11500 DUAL JB9 J55 P30B42 125 0 12000 DUAL JFS H22 0r H23 P30B42 125 0 14000 DUAL JFS H22 ur H23 P30842 125 0 14500 DUAL JFS H22 or H23 P31042 133 0 7600 SINGLE JB7 STD JBB J55 P31042 133 0 8200 SINGLE JB7 STD JBB J55 P31042 133 0 9000 SINGLE JEIB J55 P31042 133 0 9000 DUAL JB8 J55 P31042 133 0 10000 DUAL JBB J55 P31042 133 0 11500 DUAL JBB J55 P31042 133 0 12000 DUAL JF9 H22 or H23 P31042 133 0 14000 DUAL JF9 H22 or H23 P31042 133 0 14500 DUAL JF9 H22 or H23 P31442 157 0 7600 SINGLE JB7 STD JB8 J55 P31442 157 0 8200 SINGLE JB7 STD JB8 J55 P31442 157 0 9000 SINGLE JBB J55 P31442 157 0 9000 DUAL J B8 J55 V P3144Z 157 0 10000 DUAL JB8 J 55 P31442 157 0 11500 DUAL JB8 J55 P31442 157 0 12000 DUAL JF9 H22 or H23 P31442 157 0 14000 DUAL JF9 H22 or H23 P31442 157 0 14500 DUAL JF9 H22 or H23 I I L V 1 I ENERAL MOTORS SERVICE PARTS OPERATION I T TRUCK 52A I 4 0O0 GROUP BRAKE SYSTEM 18 REV 2 S7 I