A A A 1989 BRAKE A SYSTEM USAGE CHART A A M TRUCK A A 1 V I 1 VEHICLE BRAKES SPECIFICATIONS MODEL WHEEL PAYLOAD GVW BRAKE NQ BASE mm RATING RATING RPO A M10905 2820 1000 1700 5600 A JB3 M10906 2820 1000 1700 TA 5600 JB3 A 1991 GENERAL MOTORS SERVICE PARTS OPERAT ONS LTTRUCK 52M T 4 9991 4 98 A 1 91