1998 GMC Sonoma Owner's Manual - Page 369

Throttle System Inspection Inspect the throttle system for interference orbinding, and for damaged or missing parts. Replace parts as needed. Replace any components that have high effort or excessivewear. Do not lubricate acceleratorand cruise control cables. Brake System Inspection Inspect the complete system. Inspectbrake lines and hoses for proper hook-up, binding, leaks, cracks, chafing, etc. Inspect disc brake pads for wear and rotors for surface condition.Also inspect drum brake linings for wear and cracks. Inspect other brake parts, including drums, wheel cylinders, calipers,parking brake, etc. Check parking brake adjustment. You may need to have your brakes inspected more often if your driving habits or conditionsresult in frequent braking. Drive Axle Service Check readfront axle fluidlevel and add as needed. Check constant velocity joints and axle seals forleaking. Transfer Case (Four-WheelDrive) Inspection Every 12 months or at oil change intervals, check front axle and transfer case and add lubricant when necessary. Check vent hose at transfer case for kinks and proper installation. More frequentlubrication may be required on off-road use. 7-47