Shocks and struts are worn when the car keeps bouncing after bumps, the nose dives hard when you brake, the body sways or leans in turns, you hear clunks over bumps, fluid leaks from the shock body, or the tires wear in a cupped, scalloped pattern. Worn dampers don't just feel bad. They can lengthen stopping distances and reduce control.
Shocks vs. struts
- Shocks dampen spring movement and are separate from the springs.
- Struts combine the damper with the spring and are part of the suspension's structure, common on the front of most cars.
Both wear gradually, so drivers often don't notice until the difference is big.
The 8 signs
Bouncing
more than once or twice after a bump or dip
Nose dive
under braking, or the rear squatting when you accelerate
Body roll
and sway in turns or crosswinds
Clunking or knocking
over bumps (could also be mounts or links)
Leaking fluid
on the shock or strut body
Cupped tire wear
scalloped dips around the tread
Longer stopping distances
, especially on rough roads
Vibration
in the steering wheel at speed
The bounce test
Push down hard on one corner of the parked car and let go. If it bounces more than about once or twice before settling, that corner's damper may be worn. It's a rough check; a mechanic's inspection is better.
Noise from the corners?
A hum that changes with speed may be a wheel bearing instead. Our car noises guide helps sort out clunks, hums and squeaks.
When to replace them
There's no fixed mileage. It depends on roads, loads and driving. Many mechanics inspect them at tire rotations and suggest replacement when they see leaks, excessive bounce or tire cupping. Shocks and struts are usually replaced in pairs (both fronts or both rears) so the car stays balanced.
Can a mobile mechanic replace shocks and struts?
Shocks: often, yes. Struts: many mobile mechanics replace them as complete "quick strut" assemblies, which avoids compressing springs on site. After strut replacement, an alignment is usually recommended, and that needs a shop with an alignment rack.
Buying a used car?
Worn suspension is something a pre-purchase inspection should catch. See pre-purchase car inspection.
Frequently asked questions
Is it dangerous to drive with worn struts?
Worn struts reduce control and can lengthen braking distances. Get them checked if you notice the signs.
Do I need an alignment after replacing struts?
Usually yes, because the strut position affects alignment angles.
Can I replace just one strut?
Replacing in pairs is recommended so both sides behave the same.
Book a suspension check
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