Bushings are wear items, and must be inspected regularly. This is especially true for rubber
bushings. Rubber bushings are designed to flex, protecting the metal components from the
stresses of normal suspension operation. Worn or damaged bushings affect axle alignment
and can reduce air spring and shock absorber life.
A telltale sign of worn bushings is metal-to-metal contact at the suspension component
connection points. Abnormal tire wear is also a good indicator. However, to avoid the expense
of ruined tires and /or damage to other suspension components, performing periodic visual
inspections can identify problems early on.
During the vehicle's regular PM service, visually inspect bushings for rubber deterioration. If
the rubber is severely cracked or pushed away from the outer or inner shell, the bushing
should be replaced. Bushings can also be checked by placing a pry bar between the trailing
arm and the hanger. Apply pressure and observe for excessive movement of the bushing.
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Virtually all shocks are designed with a dampening effect on both rebound and compression.
That dampening is what stabilizes the vehicle. Once gone, the vehicle (or suspension) is free
to move at-will, unrestricted. Continued, unnecessary movement of the suspension will wear
air springs and other suspension components out prematurely.
Shocks should also be checked during regular vehicle maintenance. Any shocks found with
damaged or missing end bushings, or that exhibit signs of leaking should be replaced. And,
while a shock absorber may not exhibit any outward appearance of damage, it can be worn
out internally, providing no resistance or dampening.
In moderate weather, a good shock will be warm to the touch when a vehicle has just returned
from a run. This heat is a result of normal internal friction and the flowing of fluid between
chambers. Once removed from the vehicle, a worn-out shock can be easily compressed.
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