1983 BRAKE SYSTEM USAGE CHART I P TRUCK 42 MODEL E VEHICLE SPECIFICATIONS BRAKE SYSTEM SPECIFICATIONS I OPT HVV I BASE BRAKES DUTY BRAKES I BRAKE RPO BRAKE RPO I MODEL WHEEL GVW DIESEL MERCHAND MERCHAND I NO BASE RATING ENG RPO RPO I P20842 125 0 6800 SINGLE JB6 JD6 STD JB7 JD7 J55 I P20842 125 0 7500 SING LE JB7 JD7 J55 P20S42 125 0 8000 SING LE JB7 JD7 J55 I P21042 133 0 6800 SINGLE JB6 JB6 STD JB7 JD7 J55 P21042 133 0 7500 SINGLE JB7 JD7 J55 I P21042 133 0 3000 SINGLE JB7 JD7 J55 I P30842 125 0 7600 SINGLE JB7 JD7 STD JB8 JB8 J55 P30842 125 0 8200 SINGLE JB7 JD7 STD JB8 JBB J55 P30842 125 0 9000 SINGLE JBB JB8 J55 P30842 125 0 9000 DUAL JB8 JB8 J55 P30842 125 0 10000 DUAL JB8 JB8 J55 P30342 125 0 11500 DUAL JB8 JB8 J55 I P30842 125 0 12000 DUAL JFS JF9 HA3 or HD1 P30842 125 0 14000 DUAL JF9 JFS HA3 or HD1 P30842 125 0 14500 DUAL JF9 JF9 HA3 or HD1 P31042 133 0 7600 SINGLE JB7 JD7 STD JB8 JB8 J55 P31042 133 0 8200 SINGLE JB7 JD7 STD JB8 JEI8 155 P31042 133 0 9000 SINGLE JB8 JB8 J55 P31042 133 0 9000 DUAL JB8 JE8 J55 P31042 133 0 10000 DUAL JB8 JBB J55 P31042 133 0 11500 DUAL JB8 JBB J55 P31042 133 0 12000 DUAL JFS JF9 HA3 or HD1 P31042 133 0 14000 DUAL JFS JFS HA3 or HD1 P31042 133 0 14500 DUAL JFS JFS HA3 or HD1 P31442 157 0 7600 SINGLE JB7 JD7 STD JB8 JB8 J55 P31442 157 0 S200 SINGLE JB7 JD7 STD JB8 JBS J55 P31442 157 0 9000 SINGLE JB8 JB8 J55 P31442 157 0 9000 DUAL JB8 JBB J55 P31442 157 0 10000 DUAL JBB JBB J55 P31442 157 0 11500 DUAL JBB JBB J55 P31442 157 0 12000 DUAL JF9 JF9 HA3 or HD1 P31442 157 0 14000 DUAL JFS JFS HA3 or HD1 P31442 157 0 14500 DUAL JF9 JFS HA3 or HD1 ENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 52A REV 2 87 BRAKE SYSTEM 31 4 000 GROUP