1993 Chevrolet Suburban Owner's Manual - Page 358

23. EXHAUST PRESSURE EGULATOR VALVE INSPECTION* -Check that thevalveworksproperly.Correctanybinding.Inspecthosesforcracks, as needed. chafingordecay.Replaceparts 24. TIREANDWHEELROTATIONANDINSPECTION -For properwear andmaximum tire life,rotatetires at thefirst 6,000miles(10 000 kilometers)forSchedule I (t) or 7,500 miles (12 500 kilometers)for Schedule II (.) andthenevery 15,000 miles(25 000 kilometers) in Section 6. thereafter. Follow theinstructionsandpatternsshown Check tires for uneven wear or damage. If irregularorprematurewear apparent,checkwheelalignment. Also, checkfordamagedwheels.See "Tires"intheIndexformoreinformation. is For dualwheels,wheneverthevehicle,wheels,orfastenersarenew, 1,000 and6,000 havethewheelfastenertorquesetatthefirst100, miles (160, 1600and 10 000 km). For 3500 H.D. Models,blockthetiresoppositethosebeingremoved keep the vehicle from rolling. 25. DRIVE AXLE SERVICE -Check readfrontaxle fluid levelandadd needed. Check constant velocity joints and axle seals for leaking. to as Locking differential-Drain fluid at first oil changeandrefill.Check fluid levelandadd asneededatsubsequent oil changes. In dusty areas,ortrailertowingapplicationsdrain fluid atevery 15,000 miles (24 135kilometers)and refill$ Standard differential -Check fluid levelandaddasneededat every oil change. In dustyareas, or trailertowingapplications,drain fluid every15,000miles (24 135kilometers)andrefi1l.t Morefrequentlubrication maybe required on heavy-dutyoroff-road use. 26. BRAKESYSTEMINSPECTION -When theengine oil ischanged, inspectthelines and hosesforproperhookup,binding,leaks,cracks, chafing,etc.Checktheparkingbrakeadjustment,andthe fluid levelin themastercylinder. A lowfluid level canindicateworndiscbrakepads which mayneedtobeserviced$ *AnEmissionControlService t A fluid loss in thesesystemsmayindicateaproblem.Havethem inspectedandrepaired at once. 7-2 1