GMC T-Series 2007, Owner'S Manual

Page: 314 / 356

(27) = Clean and lubricate air brake automatic
slack adjuster. Check pushrod travel and
auto adjustment operation. Have serviced if
needed.
(28) = Air brake chamber service: Check operation,
mounting clamps, and air lines and check for
leaks.
(29) = Trailer brake hand control valve service:
Check operation; lubricate cam and follower.
(30) = Tighten the wheel stud nuts to the specified
torque values at 100 miles (160 km). Thereafter,
tighten them 1,000 miles (1 600 km) after each
time the wheel is removed. See Tightening
the Wheel Nuts on page 259.
(31) = Inspect and clean any accumulated dirt,
gravel, or other foreign objects from the valves and
valve boots as needed. Using light oil, lubricate
brake pedal to brake application valve linkage
components. Check any rubber boots for cracks,
holes, or deterioration and replace if necessary.
(32) = Check for filter ash, sensor adjustment,
and sensor hose restriction. Clean as needed.
This service can be complex; you should
have your dealer/retailer perform this service.
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