to some extent. Once complete with the work in the rear, re-check the front. If you 'twist'
the rear, the front will be affected.
FRONT:
Coil springs sometimes break near the end and wedge in place without obvious indication of
the failure. Look hard. If you think this might have happened, the only way to prove it is to
remove the spring.
In the front, the measurement is checked on each side between the lower control arm rubber
bumper bracket and cross member flange. This measurement must be perpendicular to the
cross member flange. It is from “iron to iron”. The rubber bumper is ignored. Look at the
illustration below.
Key here is that both sides of the front axle should be the same, and this measurement is
used in the CASTER determination. The front air bags should be inflated to the
recommended pressure for your chassis. Don't attempt to raise or lower the chassis
measurements using the air bags. (If your motorhome has air bags that have been added to
the rear to compensate for sagging springs, make sure they are set to the pressure you plan
on maintaining in them.)
Now, take that front measurement and find it in the top row of the chart below, then go
Main Body Page 14 of 38 Total Pages
