Loose or damaged shocks produce a loud clanking or banging sound. The rapid up-and-down movement of the suspension can hammer the loose shock absorber against the body, the shock tower, or the control arm.

To check shock absorber condition, locate any problems with a bounce test and a visual inspection. To perform a shock absorber bounce test, simply push up and down on each corner of the vehicle body. Then release the body and count the number of times the vehicle moves up and down. Generally a GOOD shock absorber should stop movement in two to three rebounds. A BAD shock absorber will let the body bounce over three times.

Visually inspect the shock absorbers for any signs of leakage (oily wetness) and damage. Also, check the bushing on each end of the shock for being smashed or split. Make sure that the shock absorber fasteners are tight. When shock absorber replacement is required, ALWAYS replace them as a pair, even if but one is defective. This action ensures the riding equilibrium of the vehicle.

NOTE

For instructions on removal and installation of shock absorbers, refer to the manufacturer's service manual.

CAUTION
With many suspension systems, you must place jack stands or lift devices under the control arms or axle when replacing the shock absorbers. This will keep the control arms or axle from flying downward when the shock is unbolted.

Strut Service
The most common trouble with a strut type suspension is worn shock absorbers. Just like conventional shock absorbers, the pistons and cylinders inside the struts can begin to leak. This reduces the dampening action and the vehicle rides poorly. As with the conventional shock absorber when a strut shock absorber leaks, it must be replaced, and ALWAYS as a pair.

Basically, strut removal involves unbolting the steering knuckle (front suspension) or bearing support (rear suspension), any brake lines, and the upper strut assembly-to-body fasteners. Remove the strut assembly (coil spring and shock) as a single unit.

CAUTION

Do NOT remove the nut on the end of the shock rod or the unit can fly apart.

A strut spring compressor is required to remove the coil spring from the strut. After the coil spring is compressed, remove the upper damper assembly. With the upper damper assembly removed, release the tension on the coil spring and lift the spring off the strut. Inspect all parts closely for damage.

WARNING
When compressing any suspension system spring, be extremely careful to position the spring compressor properly.. If the spring were to pop out of the compressor, serious injuries or death could result.

With the coil spring and upper damper unit removed, you can now remove the shock cartridge. A new shock cartridge can be installed in the strut outer housing to restore the strut to perfect condition. Some manufacturers recommend that the strut shock absorber be rebuilt once the strut shock absorber is repaired or replaced. The strut can be reassembled and installed in reverse order of disassembly,.

NOTE
For exact procedures for the removal, repair, and installation of a strut assembly, refer to the manufacturer's service manual.