1993 GMC Safari Owner's Manual - Page 318

Scheduled Maintenance Services 13. TIREANDWHEELROTATIONANDINSPECTION -For properwear 6,000 miles(10 000 andmaximumtirelife,rotatetiresatthefirst kilometers)forSchedule I or7,500miles(12 500 kilometers)for 500 kilometers)thereafter. Schedule II andthenevery7,500miles(12 6. Checktiresfor FollowtheinstructionsandpatternsshowninSection unevenwearordamage.Ifirregularorprematurewearisapparent, checkwheelalignment. Also, checkfordamagedwheels.See"Tires"in . the Index for more information. 14. DRIVEAXLESERVICE -Check readfrontaxlefluidlevelandaddas needed.Checkconstantvelocityjointsandaxlesealsforleaking. Lockingdifferential -Drainfluidatfirstoilchangeandrefill.Check fluidlevelandaddasneededatsubsequentoilchanges. In dusty areas, or trailertowingapplicationsdrainfluidatevery15,000miles (24 135kilometers)andrefi1l.t Standarddifferential -Check fluidlevelandaddasneededat everyoilchange.Industyareas,ortrailertowingapplications,drain fluidevery15,000miles(24135kilometers)andrefi1l.t oilischanged, 15. BRAKESYSTEMINSPECTION -Whentheengine inspectthelinesandhosesforproperhookup,binding,leaks,cracks, chafing,etc.Checktheparkingbrakeadjustment,andthefluidlevel themastercylinder. A lowfluidlevelcanindicateworndiscbrakepads whichmayneedtobe servicedj Whenthewheelsareremovedforrotation,inspectdiscbrakepadsfor Also inspectdrumbrakeliningsfor wearandrotorsforsurfacecondition. wearandcracks.Inspectotherbrakeparts,includingdrums,wheel cylinders,parkingbrake,etc.,atthesametime. Inspectbrakesmoreoftenifdrivinghabitsorconditionsresult frequentbraking. t A fluid loss inthesesystemsmayindicateaproblem.Havetheminspected andrepairedatonce. in in 7-1 0