GMC TopKick 2007 Owner's Manual page 390

•
Replace the air compressor filter element,
mounted on the air compressor. For remote
air compressor intake service, refer to engine
air cleaner filter replacement.
•
Remove, disassemble, clean, and inspect
the safety valve, service brake chambers,
quick release valves, quick release/double
check valve combinations, parking brake
control valve, double check valves, pressure
protection valves, and ether injector
(if equipped).
•
Remove, disassemble, and clean the
application valve; replace parts showing wear.
•
Remove, disassemble, clean, and inspect
the spring brake control valve; replace
rubber parts.
(33) = Clean and lubricate air brake automatic
slack adjuster. Check pushrod travel and
auto adjustment operation. Have serviced
if needed.
390
(34) = Air brake chamber service: Check operation,
mounting clamps, and air lines and check for leaks.
(35) = Trailer brake hand control valve service:
Check operation; lubricate cam and follower.
(36) = 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 324.
(37) = 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.