1991 92 BRAKE SYSTEM USAGE CHART S TRUCK VEHICLE BRAKE SPECIFICATIONS BRAKE RPO MODEL WHEEL NO BASE mm GVWR 2 5E 2 8L 4 3Z 10603 2750 4200 JM7 JM5 JM3 S10803 2995 4200 JM7 JM5 JM3 10653 3122 4200 JM7 JM5 JM3 10516 2553 4350 JM3 10603 2750 4600 JM5 JM5 JM3 510803 2995 4600 JM5 JM5 JM3 S10653 3122 4600 JM5 JM5 JM3 510506 2718 4850 JM3 1991 92 BRAKE SYSTEM USAGE CHART T TRUBK VEHICLE BRAKE SPECIFICATIONS BRAKE RPO MODEL WHEEL NO BASE mm GVWR 2 5E 2 8L 4 32 T10603 2750 4650 5150 JM3 T10803 2995 4650 5150 JM3 T10516 2553 4700 JM3 T10653 3122 4650 5150 JM3 T10506 2718 5100 JM3 JM7 240 SINGLE DIAPHRAGM BOOSTER JM5 200 TANDEM DIAPHRAGM BOOSTER JM3 240 TANDEM DIAPHRAGM BOOSTER 1 1992 GENEFIAL MOTORS SERVICE PARTS OPERATIONS LT TRL CK 53S L 1 1 92 4 67 4 999