BRAKES 1987 BRAKE SYSTEM USAGE CHART R TRUCK VEHICLE BRAKE SPECIFICATIONS MODEL WHEEL REAR GVW BRAKE N0 BASE WHEELS RATING RPO R10703 117 5 SINGLE 4900 JB1 GAS R10703 117 5 SINGLE 5600 JB3 GAS R10703 117 5 SINGLE 5600 JD3 DIESEL R10703 117 5 SINGLE 6100 JB5 GAS R10703 117 5 SINGLE 6250 JD5 DIESEL R10903 131 5 SINGLE 4900 JB1 GAS R10903 131 5 SINGLE 5600 JB3 GAS R10903 131 5 SINGLE 5600 JD3 DIESEL R10903 131 5 SINGLE 6100 JB5 GAS R10903 131 5 SINGLE 6250 JD5 DIESEL R10906 129 5 SINGLE 6800 JB5 GAS R10906 129 5 SINGLE 7000 JD5 DIESEL R20903 131 5 SINGLE 7200 JB6 GAS R20903 131 5 SINGLE 7200 JD6 DIESEL R20903 131 5 SINGLE 8600 JB7 GAS R20903 131 5 SINGLE 8600 JD7 DIESEL R20906 129 5 SINGLE S8600 JB GAS R20906 129 5 SINGLE 8600 JD7 DIESEL R20943 164 5 SINGLE 8600 JD7 DIESEL R20943 164 5 SINGLE 8600 JB7 GAS R30903 131 5 SINGLE 9000 JB8 GAS DIESEL R30903 131 5 DUAL 10 500 JB8 GAS DIESEL R31003 135 5 SINGLE 9000 JB8 GASYDIESEL R31003 135 5 DUAL 10 500 JB8 GAS DIESEL R31403 159 5 SINGLE 9000 JB8 GAS DIESEL R31403 159 5 DUAL 10 500 JB8 GAS DIESEL T R30943 164 5 SINGLE 9000 JB8 GAS DIESEL R30943 164 5 DUAL 10 500 JB8 GAS DIESEL f 1988 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 4 52R REV 1 88 BRAKE SYSTEM 5 4 000 GROUP