•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.
(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. SeeTightening the Wheel Nuts on page 5-80.
(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.
(38)= Estimated minimum. Actual mileage depends on
fuel and oil consumed.
(39)= If the vehicle has the Isuzu diesel engine and is
used primarily for long trip, highway service, change
the engine oil and filter every 18,000 miles (28 800 km),
or every 12 months, or every 750 hours of engine
operation, whichever occurs first.
(40)= Make sure any safety belt reminder light and
safety belt assemblies are working properly. Look
for any other loose or damaged safety belt system parts.
If you see anything that might keep a safety belt
system from doing its job, have it repaired. Have any
torn or frayed safety belts replaced.
6-25
Outside
Convex Mirrors............................................2-52
Heated Mirrors............................................2-52
Manual Mirrors............................................2-51
Power Mirrors.............................................2-51
Overspeed Warning Light.................................3-40
P
Paint, Damage...............................................5-93
Park Brake............................................2-38, 2-41
Parking.........................................................2-35
Brake Burnish Procedure..............................2-43
Over Things That Burn.................................2-44
Two-Speed Rear Axle..................................2-36
Part A - Scheduled Maintenance Services............ 6-4
Part B - Owner Checks and Services................6-26
PartC-Recommended Fluids and
Lubricants..................................................6-31
PartD-Maintenance Record...........................6-33
Passing.........................................................4-11
Perchlorate Materials Requirements,
California..................................................... 5-4
Power
Door Locks.................................................. 2-7
Electrical System.........................................5-96
Reduced Engine Light..................................3-42
Steering Fluid.............................................5-49
Windows...................................................... 2-9
Power Take-Off Light.......................................3-43Power Take-Off (PTO).....................................2-30
Privacy..........................................................7-11
Event Data Recorders..................................7-12
Navigation System.......................................7-13
OnStar.......................................................7-13
Radio Frequency Identification.......................7-13
R
Radio Frequency Identification (RFID),
Privacy......................................................7-13
Radio(s)........................................................3-49
Radios
Reception...................................................3-58
Setting the Clock.........................................3-48
Theft-Deterrent............................................3-57
Range Inhibit Warning Indicator........................3-31
Reading Lamps..............................................3-17
Rear Axle......................................................5-67
Differential Lock Control................................. 4-7
Shift Motor.................................................5-68
Rear Heating System......................................3-23
Rear Seat Operation.......................................1-10
Rearview Mirrors.............................................2-51
Reduced Engine Power Light............................3-42
Remote Keyless Entry (RKE) System.................. 2-3
Remote Keyless Entry (RKE) System,
Operation..................................................... 2-4
Replacement Parts, Maintenance.....................5-108
9
