Shocks
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Guide to Inspecting Shocks
Truck Shocks Regularly scheduled shock maintenance doesn't cost in the long run - it saves!
Like most other chassis components, a program of regular scheduled maintenance for shock absorbers will help to avoid unscheduled down time and reduced overall maintenance costs.

The role of a shock has changed dramatically. Not so many years ago, most suspensions had heavy multi-leaf springs with limited travel and a great deal of inherent friction. These suspensions quickly self dampened and therefore limited the amount of work the shock needed to perform.
Low friction suspensions such as air and taper leaf have dramatically changed the shock's role. Shocks now play a critical role in dampening suspension oscillation.

Properly functioning shocks can help reduce the wear of more expensive suspension components such as air bags, while assisting in the reduction of tire wear and vibration damage to the cab and chassis. They also aid in reducing driver fatigue. Worn shocks simply cannot assist in providing control over today's sophisticated suspension systems.

When Should shocks be replaced?
There are many tell tale signs that indicate it may be time to replace shocks.
Inspect for
Uneven Tire Wear
Ride Deterioration
Excess Vibration
Sagging Taper Leaf Springs - This is not caused by weak shocks
Premature wear on cab, electrical, and cooling system components
Broken or Torn Air Springs - Shocks will only affect this if they are broken or are missing

Leaking Vs. Misting Shocks
Misting shocks are often mis-diagnosed as failures. Misting is the process whereby very small amounts of shock fluid evaporate at high operating temperatures through the upper seal of the shock. When the "mist" reaches the cooler outside air, it condenses and forms a film on the outside of the shock body. When mixed with road debris and dust, a grime will often coat the entire body of the shock. Misting is a perfectly normal and necessary function of the shock. The fluid which evaporates through the seal area helps to lubricate & prolong the life of the seal.

Many technicians find it difficult to differentiate between a misting shock and a true leaker which need to be replaced. A leaker will show clear signs of fluid leaking in streams from the upper seal. These streams can most easily be seen when the shock is fully extended, and one inspects as far up the main body of the shock (underneath the dust cover or tube) as possible.