1991 92 BRAKE SYSTEM USAGE CHART P TRUCK VEHICLE BRAKE SPECIFICATIONS MODEL WHEEL REAR GVW BRAKE N0 BASE WHEELS RATING RPO P30842 125 0 SINGLE 8400 JD7 DIESEL P30842 125 0 SINGLE 10 000 JB8 GAS DIESEL P31042 133 0 SINGLE 8400 JB7 GAS P31042 133 0 SINGLE 8400 JD7 DIESEL P31042 133 0 SINGLE 10 000 JB8 GAS DIESEL P31442 157 0 SINGLE 8400 JB7 GAS P31442 157 0 SINGLE 8400 JD7 DIESEL P31442 157 0 SINGLE 10 000 JB8 GAS DIESEL P31842 178 0 DUAL 10 000 JB8 GAS DIESEL P31132 137 0 DUAL 10 000 JB8 GAS DIESEL P31432 158 5 DUAL 10 000 JB8 GAS DIESEL NOTE JF9 4 WHEEL DISC BRAKES N 1992 GENERAL MOTORS SERVICE PARTS 0PEF AT 0NS LT TRUCK 53P t 9 92 4 55 4 999