SETTING RIDE HEIGHT PART 7: STARTING & OPERATING THE VEHICLE
– 112 – Y53-6007 (R10/06)
• For tandem axles, make the vertical measurement
at the centerline of the suspension (see illustration
on page 109).
• 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.
4. 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-inch (3
mm) dowel (see
page 111).
5. Torque the mounting fasteners to 55–75 Lb. in. (6.2–
8.5 N.m.).
6. Remove the alignment pin or dowel.
7. Repeat Steps 2 through 6 above for the RH valve on
vehicles with a dual-valve system.
Driving With Deflated Air Springs
If an air spring is ruptured, there will be enough air pres-
sure to drive the vehicle to a safe stop off the highway to
investigate the problem.
WARNING! Your brakes could fail if you con-
tinue driving with deflated air springs. Air
escaping from the system will lower the air
pressure, which could cause a spring brake to
engage. The spring brake may cause your
brakes to drag and burn up the linings. Don’t
continue to operate in this condition.
You can get to a repair facility if you do the following:
1. Remove the height control link connected to the axle
and to the suspension air valve control arm. This will
cause the air valve control arm to center in the closed
position.
2. The air system can then be pumped up to normal
pressure for continued operation.
WARNING! Low air pressure could make the
brakes unsafe for driving. Before driving the
vehicle, make sure the pressure does pump
up to over 100 psi for normal brake operation.
If the air pressure does not pump up to at
least 100 psi, don’t try to move the vehicle.
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