T131 T 1979 BRAKE SYSTEM USAGE CHART ICon t I T 1979 j V P TRUCK 42 MODEL GASOLINE ENGINE I VEHICLE SPECIFICATIONS BRAKE SYSTEM SPECIFICATIONS OPT HVY BASE BRAKES DUTY BRAKES I MODEL WHEEL GVW BRAKE MERCHAND BRAKE MERCHAND V NO BASE RATING RPO RPO RPO RPO A mosaz 1o2 o swan Jas srb K 3 P20842 125 0 6800 SINGLE JB6 STD JB7 J55 I P20842 125 0 7500 SINGLE JB7 J55 I P20B42 125 0 8000 SINGLE JB7 J55 T P21042 133 0 6800 SINGLE JB6 STD JB7 J55 I P21042 133 0 7500 SINGLE JB7 J55 I P21042 133 0 8000 SINGLE JB7 J55 I P30B42 125 0 7600 SINGLE JB7 STD JB8 J55 P30842 125 0 8200 SINGLE JB7 STD JB8 J55 F 30842 125 0 9000 SINGLE JB8 J55 V P30B42 125 0 9000 DUAL JB8 J55 I P30842 125 0 10000 DUAL JB8 J55 T P30842 125 0 10980 DUAL JB8 J55 P30842 125 0 12000 DUAL JF9 H22 or H23 P30842 125 0 14000 DUAL JF9 H22 or HZ3 P30842 125 0 14500 DUAL JF9 H22 or H23 P31042 133 0 7600 SINGLE JB7 STD VJBB J55 P3I042 133 0 8200 SINGLE JB7 STD JB8 J55 F 31042 133 0 9000 SINGLE JEB J55 P31042 133 0 9000 DUAL JB8 J55 P3104Z 133 0 10000 DUAL JB8 J55 P31042 133 0 10980 DUAL JB8 J55 P31042 133 0 12000 DUAL JF9 H22 or H23 F31042 133 0 14000 DUAL JF9 H22 or H23 P31042 133 0 14500 DUAL JF9 H22 or H23 F31442 157 0 7600 SINGLE JB7 STD JB8 J55 I P31442 147 0 8200 SINGLE JB7 STD JB8 J55 P31442 157 0 9000 SINGLE JB8 J55 P31442 157 0 9000 DUAL JEB J55 T P31442 157 0 10000 DUAL JB8 J55 I P31442 157 0 10980 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 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 52A REV 2 87 BRAKE SYSTEM 5 4 OOO GROUP