BRAKES 1988 BRAKE SYSTEM USAGE CHART n Tnucx VEHICLE BRAKE SPECIFICATIONS MODEL WHEEL REAR GVW BRAKE NO BASE WHEELS RATING RPO R10906 129 5 SINGLE 6100 6800 JB5 GAS R10906 129 5 SINGLE 6400 7000 JD5 DIESEL R20906 129 5 SINGLE 8600 JB7 GAS R20906 129 5 SINGLE 8600 JD7 DIESEL R20943 164 5 A SINGLE 8600 JD7 DIESEL R20943 164 5 SINGLE 8600 JB7 GAS R31003 135 5 SINGLE 9000 JB8 GAS DIESEL R31003 135 5 DUAL 9000 10 50O JB8 GAS DIESEL R31403 159 5 SINGLE 9000 9600 JB8 GAS DIESEL R31403 159 5 DUAL 10 000 10 500 JB8 GAS DIESEL R30943 164 5 SINGLE 9000 9600 JB8 GAS DIESEL R30943 164 5 DUAL 10 000 10 500 JB8 GAS DIESEL ff 1988 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 52R REV 1 88 BRAKE SYSTEM 7 4 000 GROUP