GMC C series 2002 Owner's Manual page 304

(35) = Drain, flush and refill cooling system. See
"Recommended Fluids and Lubricants" in the Index
for what to use. Inspect hoses. Clean radiator, condenser,
pressure cap and neck. Pressure test cooling system and
pressure cap. For Caterpillar R diesel engines, always
refer to the Caterpillar Diesel Engine Operation &
Maintenance Manual for coolant recommendations
and change intervals.
(37) = Rear axle service: Change the lubricant.
See "Recommended Fluids and Lubricants" in
the Index.
(38) = Front axle service: Re
roller bearing.
(39) = Air brake service:
D
Inspect brake lines and hoses for proper hook
binding, leaks, cracks, chafing, etc. Inspect drum
brake linings for wear or cracks. Inspect other brake
parts at each wheel, including drums, wheel
cylinders and piston heat shields, boots and wheel
speed sensor wiring. Check brake pedal for excessive
free play or travel (or every 6 months, whichever
occurs first) and have serviced if needed. Check
brakes more often if driving habits and conditions
result in frequent braking.
-
pack upper kingpin
-
up,
D
Test air lines for leaks; tighten as needed. Replace
compressor filter.
D
Inspect air parking brake chamber for leaks and
damage. Inspect lines and hoses for leaks, cracks,
chafing, etc. Also check all attachments for
tightness, wear or damage. Note: The spring brake
section of the rear brake diaphragms are
-
non serviceable.
D
Replace the air compressor filter element,
mounted on the air compressor. For remote air
compressor intake service, refer to engine air cleaner
filter replacement.
(40) = Clean and lubricate air brake automatic slack
adjuster. Check pushrod travel and auto adjustment
operation. Have serviced if needed.
(41) = Air brake chamber service: Check operation,
mounting, clamps and air lines and check for leaks.
(42) = Trailer brake hand control valve service: Check
operation; lubricate cam and follower.
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