With the engine still off, make one full brake ap-
plication and observe the pressure drop on the
primary air gauge. If pressure drops more than
25 psi (172 kPa), eliminate any leaks before op-
erating the vehicle.
Maximum Allowable Air Leakage
Description
Pressure Drop:
psi (kPa) Per Minute
Released Applied
Truck or Tractor Only 2 (14) 3 (21)
Truck or Tractor w/Single Trailer 3 (21) 4 (28)
Table 21.1, Maximum Allowable Air Leakage
7.
Check for fault codes.
Turn the ignition switch to the ON position and
check the instrumentation control unit (ICU3) for
fault codes. Have any active fault codes serviced
before operating the vehicle.
8.
Inspect the mirrors, window glass, and wind-
shield for cracks or other damage.
9.
Ensure that the horn, windshield wipers, and
windshield washers are operating properly.
These devices must be in good working order for
safe vehicle operation.
10.
Ensure the heater and defroster are operating
properly.
11.
Check the operation of all interior lights.
11.1
Turn on the headlights and leave them on.
Ensure all equipped gauge bulbs illumi-
nate in the dash message center.
11.2
Ensure all equipped driver control
switches illuminate.
11.3
Ensure both turn signal indicator bulbs
illuminate in the dash message center
when the turn signal switch is activated.
12.
Check the operation of all exterior lights. See
Fig. 21.8.
12.1
Activate the high-beam headlights and
hazard warning lights.
12.2
Exit the cab and check that all exterior
lights and reflectors are clean and intact.
12.3
Check that the brake lights, taillights,
headlights, turn signals, marker lights,
identification lights, and clearance lights
are working properly.
13.
Inspect the seat belts and tether belts.
WARNING
Inspect and maintain seat belts. When any part of
a seat belt system needs replacement, the entire
seat belt must be replaced, both retractor and
buckle side. Any time a vehicle is involved in an
accident, and the seat belt system was in use,
the entire vehicle seat belt system must be re-
placed before operating the vehicle. Do not at-
tempt to modify the seat belt system; doing so
could change the effectiveness of the system.
Failure to replace worn or damaged seat belts, or
making any modifications to the system, may re-
sult in personal injury or death.
01/31/2011 f545733
1
2
3
3
4
5
1. Headlight
2. Turn Signal
3. Clearance Marker
Lights
4. I.D. Marker Lights
5. Fender Marker Light
Fig. 21.8, Exterior Lights
Pre- and Post-Trip Inspections and Maintenance
21.7
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