I A I 1990 91 BRAKE SYSTEM USAGE CHARTV I M TRUCK V VEHICLE BRAKE SPECIFICATIONS MODEL WHEEL GVW BRAKE N0 BASE mm ENGINE RATING RPO M10905 EXC YF7 2802 4 32 5400 JA4 I M10905 W YF7 V 4 32 5600 JM4 M10906 4 32 5600 JM4 M10905 4 3B V JM4 M10906 4 38 JM4 M11005 EXC YF7 2802 4 32 A 5600 JA4 M1105 W YF7 4 32 4 38 5850 JM4 M1106 4 32 4 38 5850 JM4 V A 1990 91 BRAKE SYSTEM USAGE CHART A I L TRUCK 4 VEHICLE BRAKE SPECIFICATIONS A MODEL WHEEL V GVW BRAKE NO BASE mm ENGINE RATING RPO L10905 ANY 5950 JM4 L10906 ANY 5950 JM4 V L11005 4 32 6100 I JM4 L11006 4 32 6100 JM4 1991 GENERAL MOTORS SERVICE PARTS OPERAT ONS LT TRUCK 52M 1 91 V 4 99 4 999 1 V