What are shock absorbers?
Shock absorbers—also known as dampers—are critical parts of your car’s suspension system. Their primary job is to absorb and dampen shocks and maintain vehicle stability.
Shocks are made from hollow tubes filled with gas, oil, and a piston. When you hit a bumpy or uneven surface, the piston moves through the tube and displaces the oil and gas. This creates a damping force to reduce shocks and bounces.
If you don't have shocks, your car’s coil springs or leaf springs will bounce continuously until the energy dissipates. Instead, the shocks work with the springs to control and dampen the bouncing and create a smoother ride.
When should I replace the shock absorbers on my car?
The lifespan of shock absorbers is typically between 50,000 and 100,000 miles or five to seven years. You’ll most likely need to replace yours within that time frame. But you should consult your owner’s manual to learn the manufacturer’s recommendation first.
Outside of the regular replacement interval, you should replace your shocks if they fail. The most common signs of bad shocks include:
Excessive bouncing: While a small amount of bouncing is normal when driving over uneven terrain or potholes, if your car bounces excessively or continuously, the shocks may be bad.
Vibrations: If you have bad shocks, you may notice vibrations in the steering wheel as you drive.
Nose diving or squatting: If your car squats in the rear when you accelerate or dives forward when you brake, you may have worn-out shocks.
Uneven tire wear: Uneven tire wear is typically a sign of steering or suspension system damage. If you notice this sign and another symptom, like excessive bouncing, there’s a good chance the shocks are to blame.
Oil leaks from the shocks: If you notice oil leaks around the shocks, it probably means they’re worn out and need to be replaced.
Cracked bushings: If the bushings at the shocks’ mounting points are cracked or damaged, you should replace the shocks.
Keep in mind: These symptoms can indicate other issues, like worn-out brakes or bad struts. The best way to accurately diagnose your car’s problem is to visit a certified mechanic.
How often should I replace my shock absorbers?
Generally, you should replace your shock absorbers every 50,000 to 100,000 miles or every five to seven years. Outside of that timeframe, you’ll need to replace your shocks if they begin showing signs of wear or failure. Common signs that it’s time to replace your shocks include excessive vehicle bouncing, increased stopping distances, and poor handling.
Can I replace my shock absorbers myself?
A shock absorber replacement can be a solid DIY project. It generally requires mid-level mechanical skills and basic tools. Experienced hobbyists and home mechanics should have no trouble replacing their shocks, but automotive novices might be better off calling a professional mechanic.
If your car has struts, the replacement process is a bit more complex. A strut replacement is a mid-to-advanced level job, and it requires more experience and specialized tools.