Guide · 5 min read
What potholes do to your car
Metro corridors, unpaved stretches and a monsoon that opens new potholes nightly all put the same parts under repeated shock. Here is what actually breaks, and how to tell.
The short version
What to take away
- The parts that fail first are the cheap ones: bushes, ball joints and strut top mounts, not the dampers.
- Oil misting on a shock absorber body means it has failed — dampers are sealed and cannot be topped up.
- A tyre sidewall bulge after a hard impact is a replace-it-now item, not a spare.
- Get the alignment checked after a significant hit; it drifts without announcing itself.
- Repeated impacts also wear wheel bearings, which show up later as a drone that grows with speed.
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What actually fails first
People assume potholes destroy shock absorbers. Dampers do fail, but the parts that go first are usually the joints and bushes around them — the lower control arm bushes, the ball joints, and the top mounts that attach the strut to the body. These are the parts that take the sharp edge of an impact, and they are rubber and soft metal by design.
That is partly good news: they are generally cheaper to replace than the damper, and a suspension refresh of bushes and joints often transforms the way a car feels over rough roads.
How to check it yourself in five minutes
- Look at each shock absorber body for a film of oil or dark wet dust sticking to it. Dampers are sealed units; oil on the outside means the seal has failed and the damper is finished. There is no topping it up.
- Look at each tyre sidewall for a bulge or a bubble. A bulge means internal cords are broken and the tyre can fail without warning — replace it rather than keeping it as a spare.
- Look at the treads of each tyre for uneven wear: one edge worn more than the other suggests alignment has drifted, which a hard pothole hit will do.
- Look at the wheel rims for a buckle or a fresh flat spot, especially on low-profile tyres.
- Park somewhere level and look at the car from the front and back. A car sitting visibly lower on one corner is worth investigating.
On the "bounce test". Pushing down on a corner and counting bounces is a folk test that no longer tells you much on modern cars with stiff springing and gas-charged dampers. Looking for oil on the damper body, and noticing whether the car keeps floating after a bump, is more reliable.
Signs it is already more than a bump
- The car keeps bouncing two or three times after a speed breaker instead of settling once — worn dampers.
- A thud or clunk you can feel through the floor or the steering, rather than just hear.
- The car wanders or needs constant small corrections on a straight road.
- It pulls to one side when you brake, or the steering wheel sits off-centre when driving straight.
- A drone that grows louder above 50–60 km/h — wheel bearings, which repeated impacts accelerate.
Why alignment matters more than it sounds
Alignment is not a cosmetic adjustment. When the wheels are not pointing where the car is going, the tyres scrub sideways, which wears them out early and makes the car less stable in the wet. One good pothole hit is enough to put it out.
There is no way to tell by looking. It needs to be measured on the rig, which is one of the reasons alignment is a workshop job rather than a doorstep one.
Also worth knowing. Alignment readings taken on a sloped or uneven floor are meaningless, because the measurements describe the ground as much as the car. That is why it is done on a level rig with the car's weight on it.
Asked next
Questions this usually raises
- How do I know if my shock absorbers are worn out?
- The most reliable sign is oil on the damper body — a shiny film or dark dust clinging to it. A failed damper is also felt rather than heard: the car keeps floating or bouncing after a bump instead of settling once. A knocking noise over bumps is more often a bush, joint or top mount than the damper itself.
- Is a tyre bulge from a pothole dangerous?
- Yes. A bulge in the sidewall means the internal cords have broken, and the tyre can fail suddenly, often at speed and often when hot. It cannot be repaired. Replace it rather than keeping it as a spare, and check the wheel rim for damage at the same time.
- Do I need an alignment after hitting a bad pothole?
- It is worth checking after any significant impact. Alignment can shift without producing an obvious symptom, and the first thing most people notice is uneven tyre wear months later — by which point the tyre is already gone. A check is quick and tells you either way.
If it comes to that
The services this usually involves
Only if the checks above point at something. Nothing here needs booking in advance of knowing that.
Suspension & Fitments
Shock absorbers, bushings, linkages, and accessory or light fitment.
Doorstep or workshop
Tyres & Wheel Care
Tyre replacement, rotation, wheel balancing and alignment on calibrated equipment.
Doorstep or workshop
Diagnostics
OBD scan, fault-code reading and a plain-English explanation of what the warning light means.
Doorstep or workshop
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