1981 BRAKE SYSTEM USAGE CHART G TRUCK GASOLINE ENGINE VEHICLE SPECIFICATIONS BRAKE SYSTEM SPECIFICATIONS OPT HVY BASE BRAKES DUTY BRAKES MODEL WHEEL BRAKE MERCHAND BRAKE MEROHAND NO BASE RPO RPO RPO RPO G11005 110 0 4900 SINGLE JB1 STD JBSIJB5 J50 J55 G11005 110 0 5400 SINGLE JB3 J50 JB5 J55 G11005 110 0 5600 SINGLE JB3 J50 JB5 J55 G11005 110 0 6000 SINGLE JB5 J55 G11305 125 0 4900 SINGLE JB1 STD JBIJB5 J50IJ55 G11305 125 0 5400 SINGLE JB3 J50 JEI5 J55 G11305 125 0 5600 SINGLE JB3 J50 JB5 J55 I GII305 125 0 I 6000 III SINGLE I JB5 J55 611006 110 0 5600 SINGLE JB3 STD JB5 J55 G11006 110 0 6000 SINGLE JB5 J55 G21005 110 0 0000 SINGLE 1125 sm G21305 125 0 0000 SINGLE JB5 sm 021000 110 0 0000 SINGLE 405 sm 021500 125 0 0000 SINGLE JB5 STD cams 125 0 s0o0 SINGLE JB7 sm S GL JB7 G31303 125 0 7400 SINGLE JB7 STD 1 G31303 125 0 8600 SINGLE JB7 STD G31303 125 0 8900 DUAL JB8 R05 G31303 125 0 10000 DUAL JB8 STD G31603 146 0 8900 DUAL JBE G31603 146 0 10000 DUAL JBB 8600 SINGLE I JB7 8900 DUAL JBB lZBIE l vw ws STD 1 I 1 1 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCK 52A l 4 OOO GROUP BRAKE SYSTEM 16 REV 2 87 I I