Monaco 2008 Knight Owner's Manual page 195

This will test how long it takes the air system
to achieve a specific pressure in a timed event
when starting at a lower pressure. This test
will verify the minimum acceptable volume of
compressed air created by the air system.
1. Start engine. Increase engine speed to
1000 rpm.
2. Beginning time for the test will
commence when air system pressure
obtains 85 psi.
3. End time when system pressure obtains
100 psi.
Elapsed time must not exceed 45 seconds.
Air Governor Cutout Test:
The air governor controls action of the air
system pump. This will test the air governor
cutout pressure setting, which indicates system
pressure has achieved maximum set psi.
1. Start engine.
2. Run engine until a chuff (air release) is
heard from the air dryer.
Maximum cutout pressure must not exceed 155
psi. Air system pressure will stabilize between
135 to 145 psi.
Unapplied Pressure Loss Test:
This test will verify maximum acceptable
air system pressure loss rate without use of
any pneumatically operated devices. This test
requires a flat, level surface as the park brake
will be released with the engine off. Chock
wheels to prevent vehicle movement.
1. Start engine.
2. Run engine until a chuff (air release) is
heard from the air dryer.
3. Shut engine off.
4. Release the park brake.
Note system pressure after air system stabilizes
from release of park brake. Air system pressure
must not lose more than 2 psi per minute.
Applied Pressure Loss Test:
This test will verify the rate of maximum
acceptable air system pressure loss with only
the service brakes applied. Do not use other
pneumatically operated devices during this test.
This test requires a flat, level surface as the park
brake will be released with the engine off. Chock
wheels to prevent vehicle movement.
1. Start engine.
2. Run engine until a chuff (air release) is
heard from the air dryer.
3. Shut engine off.
4. Release the park brake.
5. Apply and hold service brake pedal.
Note system pressure after air system pressure
stabilizes. Air system pressure must not lose
more than 3 psi per minute.
Low Air Warning Test:
This test will verify low air warning buzzer/
lamp activation. A Low Air warning buzzer or
lamp will sound/illuminate should air system
pressure fall to 60 or 65 psi.
1. Start engine.
2. Run engine until low air warning
indicators are inactive.
3. Shut engine off then turn key to ignition
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4. Fan (apply/release in quick succession)
service brake pedal.
Low air warning indicator will sound no lower
than 60 psi.
Park Brake Apply Test:
The park brake will automatically apply if low
air warning indicator(s) are ignored and system
pressure falls well below safe operating levels.
A flat, level surface is required as the park brake
will be released with the engine off. Chock
wheels to prevent vehicle movement.
1. Start engine.
2. Run engine until low air warning
indicators are inactive.
3. Shut engine off.
4. Release park brake.
5. Fan (apply/release in quick succession)
service brake pedal.
The park brake will automatically apply
between 20 to 40 psi.
Park Brake Hold Test:
This test will verify engagement of the park
brake. A flat, level surface is required. While the
test is performed with the park brake applied,
use precautions in case of vehicle movement.
This test only verifies the park brake is engaged.
It is not intended to verify the maximum amount
of braking force created by the park brake.
1. Start engine.
2. Place transmission into gear. Do not
release park brake.
3. Apply light throttle, not to exceed 1,000
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