1 981 BRAKE SYSTEM USAG E CHART 1981 I C TRUCK GASOLINE ENGINE VEHICLE SPECIFICATIONS BRAKE SYSTHVI SPECIFICATIONS OPT HVV BASE BRAKES DUTY BRAKES MODEL REAR BRAKE MERCHAND BRAKE MERCHAND N0 WHEELS RPO RPO RPO RPO C10703 117 5 4700 SINGLE JB1 STD C10703 117 5 5200 SINGLE JB3 J50 JB5 J55 C10703 117 5 5600 SINGLE JB3 J50 JB5 J55 C10703 117 5 6000 SINGLE JB5 J55 010903 131 5 4700 SINGLE JB1 STD C10903 131 5 5200 SINGLE JB3 J50 JB5 J55 310903 131 5 5600 SINGLE JB3 J50 JB5 J55 I a 2 e I econ I s cu I I C10906 129 5 6100 SINGLE JB5 STD C10906 129 5 6800 SINGLE JB5 STD C20903 131 5 6400 SINGLE JB6 STD JB7 J55 C20903 131 5 7200 SINGLE JB6 STD JB7 J55 CZ0903 131 5 8600 SINGLE JB7 J55 C20906 129 5 8600 SINGLE JB7 STD czow 164 5 S GLE JB7 C30903 131 5 9000 SINGLE JEI8 STD C30903 131 5 10000 DUAL JBB FI05 C30903 131 5 10500 DUAL JBB FI05 C31003 135 5 9000 SINGLE JBS STD C31003 135 5 10000 DUAL JBB R05 331003 135 5 10500 DUAL JB8 R05 C31403 159 5 9000 SINGLE JB8 STD C31403 159 5 10000 DUAL JB8 R05 C31403 159 5 10500 DUAL JBS R05 C30943 164 5 9000 SINGLE JB8 STD C30943 164 5 9600 DUAL JB8 STD C30943 164 5 10000 DUAL JB8 R05 Y Y I I ENERAL MOTORS SERVIOE PARTS OPERATIORS LT TRUCK 52A 4 OOO GROUP BRAKE SYSTEM 12 REV 2 87