GMC T-Series 1999 Owner's Manual page 278

Scheduled Maintenance (Except DURAMAX
72,000 Miles (120 000 km) (Continued)
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Replace air conditioning filter dryer (or every
18 months, whichever occurs first, and whenever
refrigerant charge is lost for any reason).
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Wheel bearing (grease type) service (or every
24 months, whichever occurs first, and whenever
hubs are removed). (23)
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Wheels and tires service. (15)
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Hydraulic brake service (or every 6 months,
whichever occurs first). (7)
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Hydraulic brake caliper service (or every 6 months,
whichever occurs first). (22)
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Hydraulic parking brake service (or every 6 months,
whichever occurs first). (8)
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Engine drive belts service (or every 12 months,
whichever occurs first). (18)
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Clutch pedal free travel service. (10)
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Throttle linkage service. (19)
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Thermostatically controlled engine cooling fan
service. (4)(20)
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Shields and undercab insulation service. (4)(5)(21)
7-16
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DIESEL)
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Air intake system service (or every 24 months,
whichever occurs first). (4)(5)(24)
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Thermostatically controlled air cleaner service (or
every 24 months, whichever occurs first). (3)(4)(25)
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Fuel tank, fuel cap and fuel lines service (or every
72 months, whichever occurs first). (3)(30)
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EGR system inspection (or every 72 months,
whichever occurs first). (3)(31)
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Electronic Vacuum Regulator Valve (EVRV)
inspection (or every 72 months, whichever occurs
first). (3)(32)
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Evaporative Control System Service (if equipped) (or
every 24 months, whichever occurs first). (3)(26)
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Rear axle air shift motor service. (11)
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Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours,
whichever occurs first).
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Clean air brake application valve (or every 3 months,
or every 300 hours, whichever occurs first);
lubricate linkage.
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Air brake chamber service (or every 2 months,
whichever occurs first). (41)
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