Drain manually drained air reservoirs.
Water and oil normally enter the air reservoir in the form of vapor because of the heat generated during compression. After the water and oil con- dense, drain the resulting emulsion as follows:
Check the fluid level in the windshield washer reservoir.
Check the coolant level in the surge tank.
Inspect the radiator and charge air cooler.
Inspect the engine and chassis wiring.
Inspect the air intake system for leaks or damage.
Check the engine oil level.
Inspect the fuel tanks, fuel lines, and connections for leaks.
Check the fuel level in the fuel tank(s).
Drain the water from the fuel/water separator as follows:
Inspect the front and rear suspension compo- nents, including springs, spring hangers, shocks, and suspension brackets.
Clean the windshield, and the side and rear win- dows, then check the condition of the windshield wiper arms and blades.
Check the oil- and air-pressure warning systems.
Make sure that the horn, windshield wipers, and windshield washers are operating properly. These devices must be in good working order for safe vehicle operation.
During cold weather, make sure the heater, defroster, and optional mirror heat controls are op- erating properly. If so equipped, turn on the mir- ror heat switch and make sure the system is working.
Check the operation of all the panel lights and interior lights.
Make sure all the exterior lights are working properly. Check that all the lights and reflectors are clean. See Fig. 11.7.
Check tire inflation pressures using an accurate tire pressure gauge.
Tires should be checked when cool. For inflation pressures and maximum loads (per tire) see the tire manufacturer’s guidelines.
A weekly pressure loss of 4 psi (28 kPa) or more in a tire may indicate damage. The tire should be inspected and, if necessary, repaired or replaced.
Inspect each tire for wear, bulges, cracks, cuts, penetrations, and oil contamination.
Check the wheel nuts or rim nuts for indications of looseness. Examine each rim and wheel component.
Inspect the air brake chamber and the air brake chamber pushrods. See Fig. 11.12.
Inspect the air brake lines.
Inspect the slack adjusters.
Check the air brake system for proper operation.
Check the air pressure buildup time as follows.
Check the air leakage in the system as follows.
Test the service brakes.
Source: MaintainX (Community Member)