Navistar WorkStar Series, Operator'S Manual

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Inspection Guide
16. Air Brake Check: Check the air brakes in the following
manner:
a. Chock wheels if necessary. Push in parking
brake and start engine.
b. Check for air compressor or governor cut-
out pressure at 125 to 135 psi (862 to 931
kPa).
Shift into a low gear, and gently
pull against service and parking brakes
separately to make sure they hold.
c. Shut off engine and TURN IGNITION BACK
ON.
d. Without brake pedal applied, note air
pressure drop for one minute. It should
be less than 2 psi (14 kPa).
e. Depress and hold brake pedal and make
sure there is no more than a 3 psi (21 kPa)
per minute pressure drop. For combination
vehicles, there should be no more than 4 psi
(28 kPa) per minute pressure drop.
f. Step on and off brake pedal and check that
warning light and alarm come on at about
60 or 76 psi (414 or 524 kPa).
g. Step on and off brake pedal and check to
make sure the parking brake knobs pop out
between 20 and 45 psi (138 and 310 kPa).
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