5-20
Air Suspension Drop
This optional feature provides a dash mounted momentary switch that will allow the opera-
tor to fully exhaust all air retained in the suspension air bags. Air in all suspensions front and
rear, (or rear only depending on vehicle configuration) is exhausted with switch activation.
This permits height of bus to be decreased by two to three inches plus or minus 1/2 inch
at the affected axle(s). Air bags become fully deflated in approximately 12 seconds, regard-
less of vehicle model, axle location, or body configuration. Air bag inflation time required
for suspension to return to normal fully inflated height is approximately 60 seconds for all
configurations.
The momentary switch has 2 positions, raised and dumped. It activates a double sole-
noid valve and once ‘dump’ is activated the suspension remains latched in lowered position
until raised by moving the switch to the ‘raised’ position or exceeding 5mph vehicle speed.
Switch illuminates to indicate when air suspension is ‘dumped’ and is extinguished when
suspension is at normal operating height.
Dump feature is operational only at vehicle speed of 5 miles per hour or less. This in-
cluded safety feature contains a speed sensor that returns suspension to normal operat-
ing height (‘raised’ position) automatically if vehicle speed exceeds 5 miles per hour. Once
normal operating height is achieved, height will be maintained regardless of vehicle speed
or engine-stop condition. Only moving dash mounted switch to ‘dump’ position will cause
suspension to lower.
SUSP
DUMP
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