T I3 I V 1979 BRAKE SYSTEM USAGE CHART Con kv V 1979 P TRUCK 42 MODEL GASOLINE ENGINE VEHICLE SPECIFICATIONS BRAKE SYSTEM SPECIFICATIONS OPT HVY BASE BRAKES DUTY BRAKES BRAKE MERCHAND BRAKE MERCHAND RPO RPO RPO RPO IIEEZIEEI mv s L M sw 1 P20842 125 0 6800 SINGLE JB6 STD JB7 J55 P20842 125 0 7500 SINGLE JB7 J55 I P2084Z 125 0 8000 SINGLE JB7 J55 P21042 133 0 6800 SINGLE JB6 STD JB7 J55 P21042 133 0 7500 SINGLE JB7 J55 P21042 133 0 8000 SINGLE JB7 J55 P30842 125 0 7600 SINGLE JB7 STD JB8 J55 P30B42 125 0 8200 SINGLE JB7 STD JB8 J55 I P30842 125 0 I 9000 SINGLE JB8 J55 P30842 125 0 9000 DUAL JB8 J55 P30842 125 0 10000 DUAL JB8 J55 1 30842 125 0 10980 DUAL JB8 J55 P30842 12510 12000 DUAL JF9 H22 or H23 P30842 125 0 14000 DUAL JFS H22 or H23 P30B42 125 0 14500 DUAL JFS H22 or H23 4 P31042 133 0 7600 SING LE JB7 STD JB8 J55 P31042 133 0 8200 SINGLE JB7 STD JB8 J55 PS1 042 133 0 9000 SINGLE JB8 J55 P31042 133 0 9000 DUAL JB8 J55 P31042 133 0 10000 DUAL JB8 J55 P31042 133 0 10980 DUAL JB8 J55 P3104Z 133 0 12000 DUAL JFS H22 ur H23 P31042 133 0 14000 DUAL JF9 H22 ur H23 P31042 133 0 14500 DUAL JF9 H22 or H23 P31442 157 0 7600 SINGLE JB7 STD JB8 J55 P31442 147 0 8200 SINGLE JB7 STD JB8 J55 P3144Z 157 0 S000 SINGLE JB8 J55 P3144Z 157 0 9000 DUAL JB8 J55 P31442 157 0 10000 DUAL JB8 J55 P31442 157 0 10980 DUAL JB8 J55 P31442 157 0 12000 DUAL JF9 H22 cr H23 P31442 157 0 14000 DUAL JF9 H22 or H23 P31442 157 0 14500 DUAL JFS H22 or H23 I VAREHOUSING AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPOFIATlON LT THUDK 52A e REV 1 84 4 5 4 000 GROUP