The Bounce Test: How to Check Worn Shocks in Your Driveway in 60 Seconds

What the bounce test actually checks

Shocks and struts control how your car’s weight shifts after a bump — how quickly the body settles back down instead of continuing to wobble. The bounce test is a rough, at-home way to feel whether that control is still there. It won’t tell you exactly what’s worn, but it’s a legitimate first check that takes under two minutes and costs nothing.

How to do it

Park on flat, level ground and make sure the parking brake is on.
Go to one corner of the car — say, the front driver’s side.
Push down on the body directly above that wheel (lean on the fender or trunk/hood edge with your body weight) as hard as you comfortably can, then let go.
Watch and count how many times the car bounces after you release it.
Repeat at each of the other three corners.

You’re not trying to bottom out the suspension — a firm, steady push is enough. What matters is what happens after you let go.

Reading the result

A shock or strut in good condition will let the car dip down once and come back up, then maybe settle with one small secondary bounce before it stops moving. If a corner bounces two or more times, or keeps oscillating for a second or two before settling, that’s a sign the shock at that corner isn’t damping the motion the way it should anymore.

Compare corners against each other, too. It’s normal for front and rear to feel slightly different since they often carry different spring rates and shock valving. What’s more telling is one corner behaving noticeably differently from the other three — that’s usually the one worth having someone look at.

Why this happens over time

Shocks and struts work by pushing hydraulic fluid (or gas, in gas-charged units) through small internal valves as the suspension moves, which is what converts motion into heat and calms the bounce. Over tens of thousands of kilometers, seals wear and internal valving loses precision, so the unit lets the spring’s energy bleed off more slowly. There’s no fixed mileage number that applies to everyone — it depends heavily on road conditions, load carried, and driving style — but it’s the kind of wear that shows up gradually, which is exactly why a hands-on check like this is useful: you may not notice a slow decline in day-to-day driving.

What the bounce test won’t tell you

It’s a coarse check, not a diagnosis. It can miss a shock that’s degraded but not yet bad enough to bounce visibly, and it can’t tell you about a leaking seal, a damaged mount, or a bent strut unless the problem is severe. A few other things worth pairing it with:

Look for fluid on the shock body. A wet, oily residue running down the outside usually means a seal has failed.
Check tire wear. Cupping (scalloped, wavy wear patches) across the tread often points to shocks that aren’t keeping the tire planted evenly.
Notice ride behavior. Extra nose-dive under braking, body roll in corners, or a harsher, “busier” ride over small bumps are all consistent with worn shocks even if the bounce test looks borderline.

What to do with the result

If one or more corners fail the bounce test clearly, it’s worth getting the suspension looked at properly — a shop can put the car on a lift and check for leaks, worn bushings, and mount play, none of which you can see from the bounce test alone. If everything settles quickly and evenly, you likely don’t need to do anything right now beyond keeping an eye on it.

Either way, it’s a good five-minute habit to build into your routine — maybe alongside checking tire pressure — so you catch a shift in how your car handles before it becomes something you feel every time you hit a pothole.

If you do want a second opinion, Mecano can help you find a real local shop and get a fair, transparent quote — no guesswork required.