Air Suspension - Chevrolet T-Series Owner's Manual

Air Suspension

Your vehicle may have the Hendrickson HAS
Series single-axle air suspension which is
designed for a single-axle on-highway use. This
feature is available in 19,000 lb (8 613.3 kg),
21,000 lb (9 525.4 kg) and 23,000 lb (10 432.6 kg)
capacities.
Rear Air Suspension Dump Control
If your vehicle is equipped with the Hendrickson
HAS Series single-axle air suspension, you
may have this control. The air suspension dump
control allows the operator to lower the deck height
approximately 4.5 inches (11.5 cm) from the
normal frame height.
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Press the bottom of the switch to deflate the air
suspension and lower the deck height. Press
the top of the switch to return the suspension to
normal deck height.
An indicator light will come on and stay on
whenever the switch is in the dumped position.
The switch to deflate
and inflate the air
suspension is located in
the instrument panel.