Replacing Shocks And Struts

Shock absorbers and struts are designed to dampen spring oscillations as the suspension goes through up's, down's and rebound. This prevents unwanted body gyrations and helps keep the wheels in contact with the road.

Most folks don't notice the gradual deterioration in ride quality until things get bad. Many shocks and struts are not replaced as often as they should be. Many need replacing in as little as 30,000 miles, other can go up to 60,000 miles. Replacement is needed if any of the following symptoms are noted:

• A bouncy ride.

• Nose dive when braking.

• Excessive body sway when cornering.

• Tail squat while accelerating.

• Fluid leaks.

• Physical damage to the shock or strut itself or its mounting hardware.

• Cupped tire wear.

• Indications of bottoming.

• Vehicle fails a bounce test: More than two oscillations after rocking and releasing the bumper.

• The rod on a gas pressurized shock or strut does not extend by itself.

As always the best advice is to see a Modern Auto Air technician and allow us to check your system.

Why Shocks and struts always should be replaced in pairs.

Unlike some steering and suspension components, there is no significant difference in wear rates between left and right shocks or struts. If one shock or strut is shot, chances are its companion also needs to be replaced.

For front versus rear, there can be differences in wear rates depending on vehicle loading and usage. Generally speaking, when front shocks or struts need replacing, so do those in the rear.

The resistance created by these orifices helps dampen spring oscillations while limiting body and suspension motions. The pumping friction heats the fluid and the heat then dissipates through the shock body into the surrounding air.

After zillions of such cycles, the cylinder bore, piston and shaft seals eventually wear out. Though original equipment shocks have improved in recent years, many still may need replacing in as little as 30,000 miles. With struts, the lifespan is about double that of a shock.

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