1984 BRAKE SYSTEM USAGE CHART P TRUCK 42 MODEL VEHICLE SPECIFICATIONS BRAKE SYSTEM SPECIFICATIONS OPT HVY BASE BRAKES DUTY BRAKES BRAKE RPO BRAKE RPO GVW REAR DIESEL MERCHAND MERCHAND RATING WHEELS ENG RPO RPO P20B42 125 0 6800 SINGLE JB6 JD6 STD JB7 JD7 J55 P20842 125 0 7500 SINGLE JB7 JD7 J55 PZO842 125 0 8000 SINGLE JB7 JD7 J55 P21042 133 0 6800 SINGLE JB6 JB6 STD JB7 JD7 J55 E21042 133 0 I 7500 I SINGLE I JB7 JD7 I J55 I I P30842 125 0 7600 SINGLE JB7 JD7 STD JB8 JEI8 J55 P30842 125 0 8200 SINGLE JB7 JD7 STD JB8 JB8 J55 P30B42 125 0 9000 SINGLE JBS JBB J55 P30842 125 0 9000 DUAL JB8 JBB J55 P30B42 125 0 10000 DUAL JB8 JB8 J55 P30842 125 0 11500 DUAL JB8 JB8 J55 P30B42 125 0 12000 DUAL JF9 JFS HA3 or HD1 1 30842 125 0 14000 DUAL JF9 JF9 HA3 ur HD1 P30B42 125 0 14500 DUAL JFS JFS HA3 nr HD1 P31042 133 0 7600 SINGLE JB7 JD7 STD JBB JB8 J55 P31042 133 0 8200 SINGLE JB7 JD7 STD JBB JBB J55 P31042 133 0 9000 SINGLE JBE JB8 J55 P31042 133 0 9000 DUAL JB8 JB8 J55 P31042 133 0 10000 DUAL JB8 JB8 J55 P31042 133 0 11500 DUAL JBB JB8 J55 P31042 133 0 12000 DUAL JF9 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 I P3144Z 157 0 8200 SINGLE JB7 JD7 STD JBS JB8 J55 P31442 157 0 9000 SINGLE JBB JBE J55 P31442 157 0 9000 DUAL JB8 JBB J55 P31442 157 0 10000 DUAL JB8 JBB J55 P31442 157 0 11500 DUAL JBS JBB J55 P31442 157 0 12000 DUAL JF9 JF9 HA3 or HD1 P31442 157 0 14000 DUAL JF9 JF9 HA3 or HD1 P31442 157 0 14500 DUAL JF9 JF9 HA3 or HD1 I I I GENEHAL MOTORS SERVICE PARTS OPEHATIONS LT TRUCK 52A 4 000 GROUP BRAKE SYSTEM 36 REV 2 87 V