6. Rotate the valve either clockwise or
counterclockwise until air pressure
in the air springs provides the ride
height specified for that
suspension. Measure the ride
height from the bottom of the frame
rail to the approximate centerline of
the rearmost drive axle hub:
• For tandem axles, make the
vertical measurement at the
centerline of the suspension.
• For a single axle, make the
measurement in front of the
axle, in the area forward of the
tires but not past the
suspension bracket.
7. When at the correct ride height,
ensure that the height control valve
lever is in the neutral position, then
install either the built-in alignment
pin or a 1/8 in. (3 mm) dowel.
8. Torque the mounting fasteners to
55-75 lb-in. (6.2-8.5 N·m).
9. Remove the alignment pin or
dowel.
10. Repeat Steps 2 through 6 above
for the right-hand valve on vehicles
with a dual-valve system.
Suspension Air Pressure Gauge &
Switch
Your vehicle may have an air suspension
and a deflation switch which allows the air
in the suspension to be exhausted from a
switch on the dash. The normal purpose of
this feature is to allow you to lower the
vehicle for loading. A guard on the switch
prevents you from accidentally deflating
the suspension.
The Suspension Air Pressure gauge
(optional) indicates the amount of air
pressure in the air suspension springs in
pounds per square inch (psi). Air pressure
in the spring is related to the rear axle load.
The greater the rear axle load, the greater
the air pressure in the air bags. Therefore,
the air pressure displayed will vary,
depending upon the rear axle load.
Air Ride Height Data
These are factory settings for ride height of
the rear air suspension.
1. Ride height
2. Centerline of suspension
Single Axle Laden Ride Height -in.
(mm)
Air Trac 11.00 (279)
Low Air Leaf 6.50 (165)
Single Axle Unladen Ride Height -in.
(mm)
Air Trac 11.39 (289)
Low Air Leaf 6.75 (171)
DRIVING - Axle and Suspension
152 Y53-6076-1D1 (09/20)
4
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