1983 BRAKE SYSTEM USAGE CHART r P TRUCK 42 MODEL VEHICLE SPEOIFICATIONS BRAKE SYSTEM SPECIFICATIONS OPT HVY BASE BRAKES DUTY BRAKES BRAKE RPO BRAKE RPO MODEL MERCHAND DIESEL MERCHAND NO RPO ENG RPO P20842 125 0 6800 SINGLE JB8 JD6 STD JB7 JD7 J55 P20842 125 0 7500 SINGLE JB7 JD7 J55 P20842 125 0 8000 SINGLE JB7 JD7 J55 P21042 133 0 6800 SINGLE JB6 JB6 STD JB7 JD7 J55 P21042 133 0 7500 SINGLE JB7 JD7 J55 P21042 133 0 8000 SINGLE JB7 JD7 J55 P30842 125 0 7600 SINGLE JB7 JD7 STD JB8 JB8 J55 P30842 125 0 8200 SINGLE JB7 JD7 STD JB8 JB8 J55 P30842 125 0 9000 SINGLE JB8 JB8 J55 P30842 125 0 9000 DUAL JB8 JB8 J55 P30842 125 0 10000 DUAL JB8 JB8 J55 P30842 125 0 11500 DUAL JB8 JB8 J55 P30842 125 0 12000 DUAL JF9 JF9 HA3 or HD1 P30842 125 0 14000 DUAL JF9 JF9 HA3 or HD1 P30842 125 0 14500 DUAL JF9 JF9 HA3 or HD1 P31042 133 0 7600 SINGLE JB7 JD7 STD JB8 JB8 J55 b P31042 133 0 8200 SINGLE JB7 JD7 I STD JB8 JB8 J55 ky P31042 133 0 9000 SINGLE JB8 JB8 J55 P31042 133 0 9000 DUAL JB8 JB8 J55 P31042 133 0 10000 DUAL JB8 JB8 J55 P31042 133 0 11500 DUAL JB8 JB8 J55 P31042 133 0 12000 DUAL JF9 JF9 HA3 or HD1 P31042 133 0 14000 DUAL JF9 JF9 HA3 or HD1 P31042 133 0 14500 DUAL JF9 JF9 HA3 or HD1 P31442 157 0 7600 SINGLE JB7 JD7 STD JB8 JB8 J55 P31442 157 0 8200 SINGLE JB7 JD7 STD JB8 JB8 J55 P31442 15 0 9000 SINGLE JB8 JB8 J55 P31442 157 0 9000 DUAL JB8 JB8 J55 P31442 157 0 10000 DUAL JB8 JB8 J55 P31442 157 0 11500 DUAL JB8 JB8 J55 P31442 157 0 12000 DUAL JF9 JF9 HA3 or HD1 P31442 157 0 14000 DUAL JF9 JF9 HA3 or HD1 P31442 15 0 14500 DUAL JF9 JF9 HA3 or HD1 b WAREHOUSlNG AND DISTRIBUTION DIVISION DF GENERAL MOTORS CORPORATION LT TRUCI 5ZA REV 1 84 M1 4 000 GROUP