1990 92 BRAKE SYSTEM USAGE CHART M TRUCK VEHICLE BRAKE SPECIFICATIONS MODEL WHEEL GVW BRAKE N0 BASE mm ENGINE RATING RPO M10905 EXC YF7 2802 4 32 5400 JA4 M10905 W YF7 4 32 5600 JM4 M10906 4 32 5600 JM4 M10905 4 3B JM4 M10906 4 3B JM4 M11005 EXC YF7 2802 4 32 5600 JA4 M1105 W YF7 4 32 4 3B 5850 JM4 M1106 4 32 4 38 5850 JM4 1990 92 BRAKE SYSTEM USAGE CHART L TRUCK VEHICLE BRAKE SPECIFICATIONS MODEL WHEEL GVW BRAKE NO BASE mm ENGINE RATING RPO L10905 ANY 5950 JM4 L10906 ANY 5950 JM4 L11005 4 32 6100 JM4 L11006 4 32 6100 JM4 1992 GENERAL MOTORS SERVICE PARTS OPERATIONS LIGHT TRUCK 53M T 1 8 92 441 4 999