Chevrolet T-Series Owner's Manual page 287

(21) = Check the fuel tank, fuel cap, and fuel
lines for damage which could cause leakage.
Inspect fuel cap for correct sealing ability and
any indications of damage. Check fuel cap gasket
for even filler neck imprint. Replace parts as
needed.
(22) = Inspect Electronic Vacuum Regulator
Valve (EVRV) filter for excessive contamination
or plugging. If needed, clean filter with solution
of soap and water, let dry and install.
(23) = Drain, flush, and refill cooling system.
This service can be complex; you should
have your dealer perform this service. See
Part C: Recommended Fluids and Lubricants
on page 295 for what to use. Inspect hoses.
Clean radiator, condenser, pressure cap,
and neck. Pressure test cooling system and
pressure cap.
(24) = Rear axle service: Change the lubricant.
See Part C: Recommended Fluids and Lubricants
on page 295.
(25) = Front axle service: Re-pack upper kingpin
roller bearing.
(26) = Air brake service:
•
Inspect brake lines and hoses for proper
hook-up, 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. Replace air dryer cartridge
only if excessive oil or moisture is present.
A small amount of oil in the system is normal
and should not be considered as a reason
to replace the cartridge.
•
Test air lines for leaks; tighten as needed.
Replace compressor filter.
•
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.
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