A shock absorber can be bench tested.
- First, turn it up in the same direction it occupies in the vehicle.
- Then, extend it fully.
- Next, turn it upside down and fully compress it.
- Repeat this operation several times. Install a new shock absorber if a lag or skip occurs near mid-stroke of the shaft's change in travel direction, or if the shaft seizes at any point in its travel, except at the ends.
- Also, install a new shock absorber if noise, other than a switch or click, is encountered when the stroke is reversed rapidly, if there are any leaks, or if action remains erratic after purging air.
- When removing and installing shock absorbers, be sure to follow the aftermarket manufacturer's instructions or those given in the service manual.